diff --git a/tests/integration/translation/chat_completions/params/__init__.py b/tests/integration/translation/chat_completions/params/__init__.py
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/tests/integration/translation/chat_completions/params/test_chat_completions_params_anthropic.py b/tests/integration/translation/chat_completions/params/test_chat_completions_params_anthropic.py
new file mode 100644
index 00000000000..f909bbb9de0
--- /dev/null
+++ b/tests/integration/translation/chat_completions/params/test_chat_completions_params_anthropic.py
@@ -0,0 +1,53 @@
+from dataclasses import replace
+from typing import Final
+
+import pytest
+from integration._support.client import Gateway
+from integration._support.provider import SharedProvider
+from integration.translation.case import TranslationTestCase
+from integration.translation.chat_completions.bases.anthropic import CLAUDE_SONNET_4_6_TEST_CASE
+from integration.translation.params import with_field
+from integration.translation.runner import assert_translation
+
+CLAUDE_SONNET_4_6_TEMPERATURE_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="temperature",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "temperature": 0.37},
+    expected_provider_request=with_field(CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("temperature",), 0.37),
+)
+CLAUDE_SONNET_4_6_TOP_P_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="top_p",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "top_p": 0.83},
+    expected_provider_request=with_field(CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("top_p",), 0.83),
+)
+CLAUDE_SONNET_4_6_STOP_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="stop",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "stop": ["<<HALT>>"]},
+    expected_provider_request=with_field(
+        CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("stop_sequences",), ["<<HALT>>"]
+    ),
+)
+CLAUDE_SONNET_4_6_USER_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="user",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "user": "user-sentinel-01"},
+    expected_provider_request=with_field(
+        CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("metadata", "user_id"), "user-sentinel-01"
+    ),
+)
+
+CASES: Final = (
+    CLAUDE_SONNET_4_6_TEMPERATURE_TEST_CASE,
+    CLAUDE_SONNET_4_6_TOP_P_TEST_CASE,
+    CLAUDE_SONNET_4_6_STOP_TEST_CASE,
+    CLAUDE_SONNET_4_6_USER_TEST_CASE,
+)
+
+
+@pytest.mark.parametrize("case", CASES, ids=lambda case: case.id)
+def test_chat_completions_params_anthropic(
+    case: TranslationTestCase, gateway: Gateway, provider: SharedProvider
+) -> None:
+    assert_translation(case, gateway, provider)
diff --git a/tests/integration/translation/chat_completions/params/test_chat_completions_params_azure.py b/tests/integration/translation/chat_completions/params/test_chat_completions_params_azure.py
new file mode 100644
index 00000000000..315200e7867
--- /dev/null
+++ b/tests/integration/translation/chat_completions/params/test_chat_completions_params_azure.py
@@ -0,0 +1,93 @@
+from dataclasses import replace
+from typing import Final
+
+import pytest
+from integration._support.client import Gateway
+from integration._support.provider import SharedProvider
+from integration.translation.case import TranslationTestCase
+from integration.translation.chat_completions.bases.azure import GPT_5_4_TEST_CASE
+from integration.translation.params import with_field
+from integration.translation.runner import assert_translation
+
+GPT_5_4_TEMPERATURE_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="temperature",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "temperature": 0.37},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("temperature",), 0.37),
+)
+GPT_5_4_TOP_P_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="top_p",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "top_p": 0.83},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("top_p",), 0.83),
+)
+GPT_5_4_N_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="n",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "n": 2},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("n",), 2),
+)
+GPT_5_4_SEED_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="seed",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "seed": 4242},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("seed",), 4242),
+)
+GPT_5_4_USER_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="user",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "user": "user-sentinel-01"},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("user",), "user-sentinel-01"),
+)
+GPT_5_4_SERVICE_TIER_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="service_tier",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "service_tier": "flex"},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("service_tier",), "flex"),
+)
+GPT_5_4_PROMPT_CACHE_KEY_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="prompt_cache_key",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "prompt_cache_key": "pck-sentinel-01"},
+    expected_provider_request=with_field(
+        GPT_5_4_TEST_CASE.expected_provider_request, ("prompt_cache_key",), "pck-sentinel-01"
+    ),
+)
+GPT_5_4_SAFETY_IDENTIFIER_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="safety_identifier",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "safety_identifier": "safety-sentinel-01"},
+    expected_provider_request=with_field(
+        GPT_5_4_TEST_CASE.expected_provider_request, ("safety_identifier",), "safety-sentinel-01"
+    ),
+)
+GPT_5_4_STORE_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="store",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "store": False},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("store",), False),
+)
+GPT_5_4_VERBOSITY_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="verbosity",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "verbosity": "low"},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("verbosity",), "low"),
+)
+
+CASES: Final = (
+    GPT_5_4_TEMPERATURE_TEST_CASE,
+    GPT_5_4_TOP_P_TEST_CASE,
+    GPT_5_4_N_TEST_CASE,
+    GPT_5_4_SEED_TEST_CASE,
+    GPT_5_4_USER_TEST_CASE,
+    GPT_5_4_SERVICE_TIER_TEST_CASE,
+    GPT_5_4_PROMPT_CACHE_KEY_TEST_CASE,
+    GPT_5_4_SAFETY_IDENTIFIER_TEST_CASE,
+    GPT_5_4_STORE_TEST_CASE,
+    GPT_5_4_VERBOSITY_TEST_CASE,
+)
+
+
+@pytest.mark.parametrize("case", CASES, ids=lambda case: case.id)
+def test_chat_completions_params_azure(case: TranslationTestCase, gateway: Gateway, provider: SharedProvider) -> None:
+    assert_translation(case, gateway, provider)
diff --git a/tests/integration/translation/chat_completions/params/test_chat_completions_params_bedrock_converse.py b/tests/integration/translation/chat_completions/params/test_chat_completions_params_bedrock_converse.py
new file mode 100644
index 00000000000..b5286904255
--- /dev/null
+++ b/tests/integration/translation/chat_completions/params/test_chat_completions_params_bedrock_converse.py
@@ -0,0 +1,57 @@
+from dataclasses import replace
+from typing import Final
+
+import pytest
+from integration._support.client import Gateway
+from integration._support.provider import SharedProvider
+from integration.translation.case import TranslationTestCase
+from integration.translation.chat_completions.bases.bedrock_converse import CLAUDE_SONNET_4_6_TEST_CASE
+from integration.translation.params import with_field
+from integration.translation.runner import assert_translation
+
+CLAUDE_SONNET_4_6_TEMPERATURE_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="temperature",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "temperature": 0.37},
+    expected_provider_request=with_field(
+        CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("inferenceConfig", "temperature"), 0.37
+    ),
+)
+CLAUDE_SONNET_4_6_TOP_P_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="top_p",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "top_p": 0.83},
+    expected_provider_request=with_field(
+        CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("inferenceConfig", "topP"), 0.83
+    ),
+)
+CLAUDE_SONNET_4_6_STOP_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="stop",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "stop": ["<<HALT>>"]},
+    expected_provider_request=with_field(
+        CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("inferenceConfig", "stopSequences"), ["<<HALT>>"]
+    ),
+)
+CLAUDE_SONNET_4_6_SERVICE_TIER_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="service_tier",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "service_tier": "flex"},
+    expected_provider_request=with_field(
+        CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("serviceTier", "type"), "flex"
+    ),
+)
+
+CASES: Final = (
+    CLAUDE_SONNET_4_6_TEMPERATURE_TEST_CASE,
+    CLAUDE_SONNET_4_6_TOP_P_TEST_CASE,
+    CLAUDE_SONNET_4_6_STOP_TEST_CASE,
+    CLAUDE_SONNET_4_6_SERVICE_TIER_TEST_CASE,
+)
+
+
+@pytest.mark.parametrize("case", CASES, ids=lambda case: case.id)
+def test_chat_completions_params_bedrock_converse(
+    case: TranslationTestCase, gateway: Gateway, provider: SharedProvider
+) -> None:
+    assert_translation(case, gateway, provider)
diff --git a/tests/integration/translation/chat_completions/params/test_chat_completions_params_gemini.py b/tests/integration/translation/chat_completions/params/test_chat_completions_params_gemini.py
new file mode 100644
index 00000000000..cac7b9ee9c1
--- /dev/null
+++ b/tests/integration/translation/chat_completions/params/test_chat_completions_params_gemini.py
@@ -0,0 +1,73 @@
+from dataclasses import replace
+from typing import Final
+
+import pytest
+from integration._support.client import Gateway
+from integration._support.provider import SharedProvider
+from integration.translation.case import TranslationTestCase
+from integration.translation.chat_completions.bases.gemini import GEMINI_3_5_FLASH_TEST_CASE
+from integration.translation.params import with_field
+from integration.translation.runner import assert_translation
+
+GEMINI_3_5_FLASH_TEMPERATURE_TEST_CASE: Final = replace(
+    GEMINI_3_5_FLASH_TEST_CASE,
+    scenario="temperature",
+    litellm_request={**GEMINI_3_5_FLASH_TEST_CASE.litellm_request, "temperature": 0.37},
+    expected_provider_request=with_field(
+        GEMINI_3_5_FLASH_TEST_CASE.expected_provider_request, ("generationConfig", "temperature"), 0.37
+    ),
+)
+GEMINI_3_5_FLASH_TOP_P_TEST_CASE: Final = replace(
+    GEMINI_3_5_FLASH_TEST_CASE,
+    scenario="top_p",
+    litellm_request={**GEMINI_3_5_FLASH_TEST_CASE.litellm_request, "top_p": 0.83},
+    expected_provider_request=with_field(
+        GEMINI_3_5_FLASH_TEST_CASE.expected_provider_request, ("generationConfig", "top_p"), 0.83
+    ),
+)
+GEMINI_3_5_FLASH_N_TEST_CASE: Final = replace(
+    GEMINI_3_5_FLASH_TEST_CASE,
+    scenario="n",
+    litellm_request={**GEMINI_3_5_FLASH_TEST_CASE.litellm_request, "n": 2},
+    expected_provider_request=with_field(
+        GEMINI_3_5_FLASH_TEST_CASE.expected_provider_request, ("generationConfig", "candidate_count"), 2
+    ),
+)
+GEMINI_3_5_FLASH_STOP_TEST_CASE: Final = replace(
+    GEMINI_3_5_FLASH_TEST_CASE,
+    scenario="stop",
+    litellm_request={**GEMINI_3_5_FLASH_TEST_CASE.litellm_request, "stop": ["<<HALT>>"]},
+    expected_provider_request=with_field(
+        GEMINI_3_5_FLASH_TEST_CASE.expected_provider_request, ("generationConfig", "stop_sequences"), ["<<HALT>>"]
+    ),
+)
+GEMINI_3_5_FLASH_SEED_TEST_CASE: Final = replace(
+    GEMINI_3_5_FLASH_TEST_CASE,
+    scenario="seed",
+    litellm_request={**GEMINI_3_5_FLASH_TEST_CASE.litellm_request, "seed": 4242},
+    expected_provider_request=with_field(
+        GEMINI_3_5_FLASH_TEST_CASE.expected_provider_request, ("generationConfig", "seed"), 4242
+    ),
+)
+GEMINI_3_5_FLASH_SERVICE_TIER_TEST_CASE: Final = replace(
+    GEMINI_3_5_FLASH_TEST_CASE,
+    scenario="service_tier",
+    litellm_request={**GEMINI_3_5_FLASH_TEST_CASE.litellm_request, "service_tier": "flex"},
+    expected_provider_request=with_field(
+        GEMINI_3_5_FLASH_TEST_CASE.expected_provider_request, ("serviceTier",), "flex"
+    ),
+)
+
+CASES: Final = (
+    GEMINI_3_5_FLASH_TEMPERATURE_TEST_CASE,
+    GEMINI_3_5_FLASH_TOP_P_TEST_CASE,
+    GEMINI_3_5_FLASH_N_TEST_CASE,
+    GEMINI_3_5_FLASH_STOP_TEST_CASE,
+    GEMINI_3_5_FLASH_SEED_TEST_CASE,
+    GEMINI_3_5_FLASH_SERVICE_TIER_TEST_CASE,
+)
+
+
+@pytest.mark.parametrize("case", CASES, ids=lambda case: case.id)
+def test_chat_completions_params_gemini(case: TranslationTestCase, gateway: Gateway, provider: SharedProvider) -> None:
+    assert_translation(case, gateway, provider)
diff --git a/tests/integration/translation/chat_completions/params/test_chat_completions_params_openai.py b/tests/integration/translation/chat_completions/params/test_chat_completions_params_openai.py
new file mode 100644
index 00000000000..09d5faeed8f
--- /dev/null
+++ b/tests/integration/translation/chat_completions/params/test_chat_completions_params_openai.py
@@ -0,0 +1,93 @@
+from dataclasses import replace
+from typing import Final
+
+import pytest
+from integration._support.client import Gateway
+from integration._support.provider import SharedProvider
+from integration.translation.case import TranslationTestCase
+from integration.translation.chat_completions.bases.openai import GPT_5_4_TEST_CASE
+from integration.translation.params import with_field
+from integration.translation.runner import assert_translation
+
+GPT_5_4_TEMPERATURE_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="temperature",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "temperature": 0.37},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("temperature",), 0.37),
+)
+GPT_5_4_TOP_P_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="top_p",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "top_p": 0.83},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("top_p",), 0.83),
+)
+GPT_5_4_N_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="n",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "n": 2},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("n",), 2),
+)
+GPT_5_4_SEED_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="seed",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "seed": 4242},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("seed",), 4242),
+)
+GPT_5_4_USER_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="user",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "user": "user-sentinel-01"},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("user",), "user-sentinel-01"),
+)
+GPT_5_4_SERVICE_TIER_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="service_tier",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "service_tier": "flex"},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("service_tier",), "flex"),
+)
+GPT_5_4_PROMPT_CACHE_KEY_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="prompt_cache_key",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "prompt_cache_key": "pck-sentinel-01"},
+    expected_provider_request=with_field(
+        GPT_5_4_TEST_CASE.expected_provider_request, ("prompt_cache_key",), "pck-sentinel-01"
+    ),
+)
+GPT_5_4_SAFETY_IDENTIFIER_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="safety_identifier",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "safety_identifier": "safety-sentinel-01"},
+    expected_provider_request=with_field(
+        GPT_5_4_TEST_CASE.expected_provider_request, ("safety_identifier",), "safety-sentinel-01"
+    ),
+)
+GPT_5_4_STORE_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="store",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "store": False},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("store",), False),
+)
+GPT_5_4_VERBOSITY_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="verbosity",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "verbosity": "low"},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("verbosity",), "low"),
+)
+
+CASES: Final = (
+    GPT_5_4_TEMPERATURE_TEST_CASE,
+    GPT_5_4_TOP_P_TEST_CASE,
+    GPT_5_4_N_TEST_CASE,
+    GPT_5_4_SEED_TEST_CASE,
+    GPT_5_4_USER_TEST_CASE,
+    GPT_5_4_SERVICE_TIER_TEST_CASE,
+    GPT_5_4_PROMPT_CACHE_KEY_TEST_CASE,
+    GPT_5_4_SAFETY_IDENTIFIER_TEST_CASE,
+    GPT_5_4_STORE_TEST_CASE,
+    GPT_5_4_VERBOSITY_TEST_CASE,
+)
+
+
+@pytest.mark.parametrize("case", CASES, ids=lambda case: case.id)
+def test_chat_completions_params_openai(case: TranslationTestCase, gateway: Gateway, provider: SharedProvider) -> None:
+    assert_translation(case, gateway, provider)
diff --git a/tests/integration/translation/chat_completions/params/test_chat_completions_params_openai_responses.py b/tests/integration/translation/chat_completions/params/test_chat_completions_params_openai_responses.py
new file mode 100644
index 00000000000..85633f53b02
--- /dev/null
+++ b/tests/integration/translation/chat_completions/params/test_chat_completions_params_openai_responses.py
@@ -0,0 +1,69 @@
+from dataclasses import replace
+from typing import Final
+
+import pytest
+from integration._support.client import Gateway
+from integration._support.provider import SharedProvider
+from integration.translation.case import TranslationTestCase
+from integration.translation.chat_completions.bases.openai_responses import GPT_5_6_SOL_TEST_CASE
+from integration.translation.params import with_field
+from integration.translation.runner import assert_translation
+
+GPT_5_6_SOL_USER_TEST_CASE: Final = replace(
+    GPT_5_6_SOL_TEST_CASE,
+    scenario="user",
+    litellm_request={**GPT_5_6_SOL_TEST_CASE.litellm_request, "user": "user-sentinel-01"},
+    expected_provider_request=with_field(
+        GPT_5_6_SOL_TEST_CASE.expected_provider_request, ("user",), "user-sentinel-01"
+    ),
+)
+GPT_5_6_SOL_SERVICE_TIER_TEST_CASE: Final = replace(
+    GPT_5_6_SOL_TEST_CASE,
+    scenario="service_tier",
+    litellm_request={**GPT_5_6_SOL_TEST_CASE.litellm_request, "service_tier": "flex"},
+    expected_provider_request=with_field(GPT_5_6_SOL_TEST_CASE.expected_provider_request, ("service_tier",), "flex"),
+)
+GPT_5_6_SOL_PROMPT_CACHE_KEY_TEST_CASE: Final = replace(
+    GPT_5_6_SOL_TEST_CASE,
+    scenario="prompt_cache_key",
+    litellm_request={**GPT_5_6_SOL_TEST_CASE.litellm_request, "prompt_cache_key": "pck-sentinel-01"},
+    expected_provider_request=with_field(
+        GPT_5_6_SOL_TEST_CASE.expected_provider_request, ("prompt_cache_key",), "pck-sentinel-01"
+    ),
+)
+GPT_5_6_SOL_SAFETY_IDENTIFIER_TEST_CASE: Final = replace(
+    GPT_5_6_SOL_TEST_CASE,
+    scenario="safety_identifier",
+    litellm_request={**GPT_5_6_SOL_TEST_CASE.litellm_request, "safety_identifier": "safety-sentinel-01"},
+    expected_provider_request=with_field(
+        GPT_5_6_SOL_TEST_CASE.expected_provider_request, ("safety_identifier",), "safety-sentinel-01"
+    ),
+)
+GPT_5_6_SOL_STORE_TEST_CASE: Final = replace(
+    GPT_5_6_SOL_TEST_CASE,
+    scenario="store",
+    litellm_request={**GPT_5_6_SOL_TEST_CASE.litellm_request, "store": False},
+    expected_provider_request=with_field(GPT_5_6_SOL_TEST_CASE.expected_provider_request, ("store",), False),
+)
+GPT_5_6_SOL_VERBOSITY_TEST_CASE: Final = replace(
+    GPT_5_6_SOL_TEST_CASE,
+    scenario="verbosity",
+    litellm_request={**GPT_5_6_SOL_TEST_CASE.litellm_request, "verbosity": "low"},
+    expected_provider_request=with_field(GPT_5_6_SOL_TEST_CASE.expected_provider_request, ("text", "verbosity"), "low"),
+)
+
+CASES: Final = (
+    GPT_5_6_SOL_USER_TEST_CASE,
+    GPT_5_6_SOL_SERVICE_TIER_TEST_CASE,
+    GPT_5_6_SOL_PROMPT_CACHE_KEY_TEST_CASE,
+    GPT_5_6_SOL_SAFETY_IDENTIFIER_TEST_CASE,
+    GPT_5_6_SOL_STORE_TEST_CASE,
+    GPT_5_6_SOL_VERBOSITY_TEST_CASE,
+)
+
+
+@pytest.mark.parametrize("case", CASES, ids=lambda case: case.id)
+def test_chat_completions_params_openai_responses(
+    case: TranslationTestCase, gateway: Gateway, provider: SharedProvider
+) -> None:
+    assert_translation(case, gateway, provider)
diff --git a/tests/integration/translation/messages/params/__init__.py b/tests/integration/translation/messages/params/__init__.py
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/tests/integration/translation/messages/params/test_messages_params_anthropic.py b/tests/integration/translation/messages/params/test_messages_params_anthropic.py
new file mode 100644
index 00000000000..47649fb7197
--- /dev/null
+++ b/tests/integration/translation/messages/params/test_messages_params_anthropic.py
@@ -0,0 +1,85 @@
+from dataclasses import replace
+from typing import Final
+
+import pytest
+from integration._support.client import Gateway
+from integration._support.provider import SharedProvider
+from integration.translation.case import TranslationTestCase
+from integration.translation.messages.bases.anthropic import CLAUDE_SONNET_4_6_TEST_CASE
+from integration.translation.params import with_field
+from integration.translation.runner import assert_translation
+
+CLAUDE_SONNET_4_6_TEMPERATURE_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="temperature",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "temperature": 0.37},
+    expected_provider_request=with_field(CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("temperature",), 0.37),
+)
+CLAUDE_SONNET_4_6_TOP_P_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="top_p",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "top_p": 0.83},
+    expected_provider_request=with_field(CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("top_p",), 0.83),
+)
+CLAUDE_SONNET_4_6_TOP_K_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="top_k",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "top_k": 7},
+    expected_provider_request=with_field(CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("top_k",), 7),
+)
+CLAUDE_SONNET_4_6_STOP_SEQUENCES_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="stop_sequences",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "stop_sequences": ["<<HALT>>"]},
+    expected_provider_request=with_field(
+        CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("stop_sequences",), ["<<HALT>>"]
+    ),
+)
+CLAUDE_SONNET_4_6_METADATA_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="metadata",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "metadata": {"user_id": "meta-sentinel-01"}},
+    expected_provider_request=with_field(
+        CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("metadata", "user_id"), "meta-sentinel-01"
+    ),
+)
+CLAUDE_SONNET_4_6_SERVICE_TIER_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="service_tier",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "service_tier": "auto"},
+    expected_provider_request=with_field(
+        CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("service_tier",), "auto"
+    ),
+)
+CLAUDE_SONNET_4_6_INFERENCE_GEO_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="inference_geo",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "inference_geo": "us"},
+    expected_provider_request=with_field(
+        CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("inference_geo",), "us"
+    ),
+)
+CLAUDE_SONNET_4_6_CONTAINER_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="container",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "container": "container_sentinel01"},
+    expected_provider_request=with_field(
+        CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("container",), "container_sentinel01"
+    ),
+)
+
+CASES: Final = (
+    CLAUDE_SONNET_4_6_TEMPERATURE_TEST_CASE,
+    CLAUDE_SONNET_4_6_TOP_P_TEST_CASE,
+    CLAUDE_SONNET_4_6_TOP_K_TEST_CASE,
+    CLAUDE_SONNET_4_6_STOP_SEQUENCES_TEST_CASE,
+    CLAUDE_SONNET_4_6_METADATA_TEST_CASE,
+    CLAUDE_SONNET_4_6_SERVICE_TIER_TEST_CASE,
+    CLAUDE_SONNET_4_6_INFERENCE_GEO_TEST_CASE,
+    CLAUDE_SONNET_4_6_CONTAINER_TEST_CASE,
+)
+
+
+@pytest.mark.parametrize("case", CASES, ids=lambda case: case.id)
+def test_messages_params_anthropic(case: TranslationTestCase, gateway: Gateway, provider: SharedProvider) -> None:
+    assert_translation(case, gateway, provider)
diff --git a/tests/integration/translation/messages/params/test_messages_params_azure.py b/tests/integration/translation/messages/params/test_messages_params_azure.py
new file mode 100644
index 00000000000..73da50a86f2
--- /dev/null
+++ b/tests/integration/translation/messages/params/test_messages_params_azure.py
@@ -0,0 +1,47 @@
+from dataclasses import replace
+from typing import Final
+
+import pytest
+from integration._support.client import Gateway
+from integration._support.provider import SharedProvider
+from integration.translation.case import TranslationTestCase
+from integration.translation.messages.bases.azure import GPT_5_4_TEST_CASE
+from integration.translation.params import with_field
+from integration.translation.runner import assert_translation
+
+GPT_5_4_TEMPERATURE_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="temperature",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "temperature": 0.37},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("temperature",), 0.37),
+)
+GPT_5_4_TOP_P_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="top_p",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "top_p": 0.83},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("top_p",), 0.83),
+)
+GPT_5_4_METADATA_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="metadata",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "metadata": {"user_id": "meta-sentinel-01"}},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("user",), "meta-sentinel-01"),
+)
+GPT_5_4_SERVICE_TIER_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="service_tier",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "service_tier": "auto"},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("service_tier",), "auto"),
+)
+
+CASES: Final = (
+    GPT_5_4_TEMPERATURE_TEST_CASE,
+    GPT_5_4_TOP_P_TEST_CASE,
+    GPT_5_4_METADATA_TEST_CASE,
+    GPT_5_4_SERVICE_TIER_TEST_CASE,
+)
+
+
+@pytest.mark.parametrize("case", CASES, ids=lambda case: case.id)
+def test_messages_params_azure(case: TranslationTestCase, gateway: Gateway, provider: SharedProvider) -> None:
+    assert_translation(case, gateway, provider)
diff --git a/tests/integration/translation/messages/params/test_messages_params_bedrock_converse.py b/tests/integration/translation/messages/params/test_messages_params_bedrock_converse.py
new file mode 100644
index 00000000000..33efbc6ef15
--- /dev/null
+++ b/tests/integration/translation/messages/params/test_messages_params_bedrock_converse.py
@@ -0,0 +1,66 @@
+from dataclasses import replace
+from typing import Final
+
+import pytest
+from integration._support.client import Gateway
+from integration._support.provider import SharedProvider
+from integration.translation.case import TranslationTestCase
+from integration.translation.messages.bases.bedrock_converse import CLAUDE_SONNET_4_6_TEST_CASE
+from integration.translation.params import with_field
+from integration.translation.runner import assert_translation
+
+CLAUDE_SONNET_4_6_TEMPERATURE_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="temperature",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "temperature": 0.37},
+    expected_provider_request=with_field(
+        CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("inferenceConfig", "temperature"), 0.37
+    ),
+)
+CLAUDE_SONNET_4_6_TOP_P_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="top_p",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "top_p": 0.83},
+    expected_provider_request=with_field(
+        CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("inferenceConfig", "topP"), 0.83
+    ),
+)
+CLAUDE_SONNET_4_6_TOP_K_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="top_k",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "top_k": 7},
+    expected_provider_request=with_field(
+        CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("additionalModelRequestFields", "top_k"), 7
+    ),
+)
+CLAUDE_SONNET_4_6_STOP_SEQUENCES_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="stop_sequences",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "stop_sequences": ["<<HALT>>"]},
+    expected_provider_request=with_field(
+        CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("inferenceConfig", "stopSequences"), ["<<HALT>>"]
+    ),
+)
+CLAUDE_SONNET_4_6_INFERENCE_GEO_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="inference_geo",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "inference_geo": "us"},
+    expected_provider_request=with_field(
+        CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("additionalModelRequestFields", "inference_geo"), "us"
+    ),
+)
+
+CASES: Final = (
+    CLAUDE_SONNET_4_6_TEMPERATURE_TEST_CASE,
+    CLAUDE_SONNET_4_6_TOP_P_TEST_CASE,
+    CLAUDE_SONNET_4_6_TOP_K_TEST_CASE,
+    CLAUDE_SONNET_4_6_STOP_SEQUENCES_TEST_CASE,
+    CLAUDE_SONNET_4_6_INFERENCE_GEO_TEST_CASE,
+)
+
+
+@pytest.mark.parametrize("case", CASES, ids=lambda case: case.id)
+def test_messages_params_bedrock_converse(
+    case: TranslationTestCase, gateway: Gateway, provider: SharedProvider
+) -> None:
+    assert_translation(case, gateway, provider)
diff --git a/tests/integration/translation/messages/params/test_messages_params_gemini.py b/tests/integration/translation/messages/params/test_messages_params_gemini.py
new file mode 100644
index 00000000000..a77b576015a
--- /dev/null
+++ b/tests/integration/translation/messages/params/test_messages_params_gemini.py
@@ -0,0 +1,55 @@
+from dataclasses import replace
+from typing import Final
+
+import pytest
+from integration._support.client import Gateway
+from integration._support.provider import SharedProvider
+from integration.translation.case import TranslationTestCase
+from integration.translation.messages.bases.gemini import GEMINI_3_5_FLASH_TEST_CASE
+from integration.translation.params import with_field
+from integration.translation.runner import assert_translation
+
+GEMINI_3_5_FLASH_TEMPERATURE_TEST_CASE: Final = replace(
+    GEMINI_3_5_FLASH_TEST_CASE,
+    scenario="temperature",
+    litellm_request={**GEMINI_3_5_FLASH_TEST_CASE.litellm_request, "temperature": 0.37},
+    expected_provider_request=with_field(
+        GEMINI_3_5_FLASH_TEST_CASE.expected_provider_request, ("generationConfig", "temperature"), 0.37
+    ),
+)
+GEMINI_3_5_FLASH_TOP_P_TEST_CASE: Final = replace(
+    GEMINI_3_5_FLASH_TEST_CASE,
+    scenario="top_p",
+    litellm_request={**GEMINI_3_5_FLASH_TEST_CASE.litellm_request, "top_p": 0.83},
+    expected_provider_request=with_field(
+        GEMINI_3_5_FLASH_TEST_CASE.expected_provider_request, ("generationConfig", "top_p"), 0.83
+    ),
+)
+GEMINI_3_5_FLASH_TOP_K_TEST_CASE: Final = replace(
+    GEMINI_3_5_FLASH_TEST_CASE,
+    scenario="top_k",
+    litellm_request={**GEMINI_3_5_FLASH_TEST_CASE.litellm_request, "top_k": 7},
+    expected_provider_request=with_field(
+        GEMINI_3_5_FLASH_TEST_CASE.expected_provider_request, ("generationConfig", "top_k"), 7
+    ),
+)
+GEMINI_3_5_FLASH_STOP_SEQUENCES_TEST_CASE: Final = replace(
+    GEMINI_3_5_FLASH_TEST_CASE,
+    scenario="stop_sequences",
+    litellm_request={**GEMINI_3_5_FLASH_TEST_CASE.litellm_request, "stop_sequences": ["<<HALT>>"]},
+    expected_provider_request=with_field(
+        GEMINI_3_5_FLASH_TEST_CASE.expected_provider_request, ("generationConfig", "stop_sequences"), ["<<HALT>>"]
+    ),
+)
+
+CASES: Final = (
+    GEMINI_3_5_FLASH_TEMPERATURE_TEST_CASE,
+    GEMINI_3_5_FLASH_TOP_P_TEST_CASE,
+    GEMINI_3_5_FLASH_TOP_K_TEST_CASE,
+    GEMINI_3_5_FLASH_STOP_SEQUENCES_TEST_CASE,
+)
+
+
+@pytest.mark.parametrize("case", CASES, ids=lambda case: case.id)
+def test_messages_params_gemini(case: TranslationTestCase, gateway: Gateway, provider: SharedProvider) -> None:
+    assert_translation(case, gateway, provider)
diff --git a/tests/integration/translation/messages/params/test_messages_params_openai.py b/tests/integration/translation/messages/params/test_messages_params_openai.py
new file mode 100644
index 00000000000..d1df0c1c912
--- /dev/null
+++ b/tests/integration/translation/messages/params/test_messages_params_openai.py
@@ -0,0 +1,47 @@
+from dataclasses import replace
+from typing import Final
+
+import pytest
+from integration._support.client import Gateway
+from integration._support.provider import SharedProvider
+from integration.translation.case import TranslationTestCase
+from integration.translation.messages.bases.openai import GPT_5_4_TEST_CASE
+from integration.translation.params import with_field
+from integration.translation.runner import assert_translation
+
+GPT_5_4_TEMPERATURE_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="temperature",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "temperature": 0.37},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("temperature",), 0.37),
+)
+GPT_5_4_TOP_P_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="top_p",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "top_p": 0.83},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("top_p",), 0.83),
+)
+GPT_5_4_METADATA_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="metadata",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "metadata": {"user_id": "meta-sentinel-01"}},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("user",), "meta-sentinel-01"),
+)
+GPT_5_4_SERVICE_TIER_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="service_tier",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "service_tier": "auto"},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("service_tier",), "auto"),
+)
+
+CASES: Final = (
+    GPT_5_4_TEMPERATURE_TEST_CASE,
+    GPT_5_4_TOP_P_TEST_CASE,
+    GPT_5_4_METADATA_TEST_CASE,
+    GPT_5_4_SERVICE_TIER_TEST_CASE,
+)
+
+
+@pytest.mark.parametrize("case", CASES, ids=lambda case: case.id)
+def test_messages_params_openai(case: TranslationTestCase, gateway: Gateway, provider: SharedProvider) -> None:
+    assert_translation(case, gateway, provider)
diff --git a/tests/integration/translation/params.py b/tests/integration/translation/params.py
new file mode 100644
index 00000000000..30681d3aa71
--- /dev/null
+++ b/tests/integration/translation/params.py
@@ -0,0 +1,13 @@
+from collections.abc import Mapping, Sequence
+from typing import Final
+
+from pydantic import JsonValue
+
+
+def with_field(mapping: Mapping[str, JsonValue], path: Sequence[str], value: JsonValue) -> Mapping[str, JsonValue]:
+    """Return a copy of `mapping` with the nested key `path` set to `value`, creating intermediate objects."""
+    head: Final = path[0]
+    if len(path) == 1:
+        return {**mapping, head: value}
+    inner: Final = mapping.get(head)
+    return {**mapping, head: with_field(inner if isinstance(inner, dict) else {}, path[1:], value)}
diff --git a/tests/integration/translation/responses/params/__init__.py b/tests/integration/translation/responses/params/__init__.py
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/tests/integration/translation/responses/params/test_responses_params_anthropic.py b/tests/integration/translation/responses/params/test_responses_params_anthropic.py
new file mode 100644
index 00000000000..b5c79e8f736
--- /dev/null
+++ b/tests/integration/translation/responses/params/test_responses_params_anthropic.py
@@ -0,0 +1,45 @@
+from dataclasses import replace
+from typing import Final
+
+import pytest
+from integration._support.client import Gateway
+from integration._support.provider import SharedProvider
+from integration.translation.case import TranslationTestCase
+from integration.translation.responses.bases.anthropic import CLAUDE_SONNET_4_6_TEST_CASE
+from integration.translation.params import with_field
+from integration.translation.runner import assert_translation
+
+CLAUDE_SONNET_4_6_TEMPERATURE_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="temperature",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "temperature": 0.37},
+    expected_provider_request=with_field(CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("temperature",), 0.37),
+    expected_litellm_response={**CLAUDE_SONNET_4_6_TEST_CASE.expected_litellm_response, "temperature": 0.37},
+)
+CLAUDE_SONNET_4_6_TOP_P_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="top_p",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "top_p": 0.83},
+    expected_provider_request=with_field(CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("top_p",), 0.83),
+    expected_litellm_response={**CLAUDE_SONNET_4_6_TEST_CASE.expected_litellm_response, "top_p": 0.83},
+)
+CLAUDE_SONNET_4_6_USER_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="user",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "user": "user-sentinel-01"},
+    expected_provider_request=with_field(
+        CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("metadata", "user_id"), "user-sentinel-01"
+    ),
+    expected_litellm_response={**CLAUDE_SONNET_4_6_TEST_CASE.expected_litellm_response, "user": "user-sentinel-01"},
+)
+
+CASES: Final = (
+    CLAUDE_SONNET_4_6_TEMPERATURE_TEST_CASE,
+    CLAUDE_SONNET_4_6_TOP_P_TEST_CASE,
+    CLAUDE_SONNET_4_6_USER_TEST_CASE,
+)
+
+
+@pytest.mark.parametrize("case", CASES, ids=lambda case: case.id)
+def test_responses_params_anthropic(case: TranslationTestCase, gateway: Gateway, provider: SharedProvider) -> None:
+    assert_translation(case, gateway, provider)
diff --git a/tests/integration/translation/responses/params/test_responses_params_bedrock_converse.py b/tests/integration/translation/responses/params/test_responses_params_bedrock_converse.py
new file mode 100644
index 00000000000..4937877721b
--- /dev/null
+++ b/tests/integration/translation/responses/params/test_responses_params_bedrock_converse.py
@@ -0,0 +1,50 @@
+from dataclasses import replace
+from typing import Final
+
+import pytest
+from integration._support.client import Gateway
+from integration._support.provider import SharedProvider
+from integration.translation.case import TranslationTestCase
+from integration.translation.responses.bases.bedrock_converse import CLAUDE_SONNET_4_6_TEST_CASE
+from integration.translation.params import with_field
+from integration.translation.runner import assert_translation
+
+CLAUDE_SONNET_4_6_TEMPERATURE_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="temperature",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "temperature": 0.37},
+    expected_provider_request=with_field(
+        CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("inferenceConfig", "temperature"), 0.37
+    ),
+    expected_litellm_response={**CLAUDE_SONNET_4_6_TEST_CASE.expected_litellm_response, "temperature": 0.37},
+)
+CLAUDE_SONNET_4_6_TOP_P_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="top_p",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "top_p": 0.83},
+    expected_provider_request=with_field(
+        CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("inferenceConfig", "topP"), 0.83
+    ),
+    expected_litellm_response={**CLAUDE_SONNET_4_6_TEST_CASE.expected_litellm_response, "top_p": 0.83},
+)
+CLAUDE_SONNET_4_6_SERVICE_TIER_TEST_CASE: Final = replace(
+    CLAUDE_SONNET_4_6_TEST_CASE,
+    scenario="service_tier",
+    litellm_request={**CLAUDE_SONNET_4_6_TEST_CASE.litellm_request, "service_tier": "flex"},
+    expected_provider_request=with_field(
+        CLAUDE_SONNET_4_6_TEST_CASE.expected_provider_request, ("serviceTier", "type"), "flex"
+    ),
+)
+
+CASES: Final = (
+    CLAUDE_SONNET_4_6_TEMPERATURE_TEST_CASE,
+    CLAUDE_SONNET_4_6_TOP_P_TEST_CASE,
+    CLAUDE_SONNET_4_6_SERVICE_TIER_TEST_CASE,
+)
+
+
+@pytest.mark.parametrize("case", CASES, ids=lambda case: case.id)
+def test_responses_params_bedrock_converse(
+    case: TranslationTestCase, gateway: Gateway, provider: SharedProvider
+) -> None:
+    assert_translation(case, gateway, provider)
diff --git a/tests/integration/translation/responses/params/test_responses_params_gemini.py b/tests/integration/translation/responses/params/test_responses_params_gemini.py
new file mode 100644
index 00000000000..c5547302d35
--- /dev/null
+++ b/tests/integration/translation/responses/params/test_responses_params_gemini.py
@@ -0,0 +1,48 @@
+from dataclasses import replace
+from typing import Final
+
+import pytest
+from integration._support.client import Gateway
+from integration._support.provider import SharedProvider
+from integration.translation.case import TranslationTestCase
+from integration.translation.responses.bases.gemini import GEMINI_3_5_FLASH_TEST_CASE
+from integration.translation.params import with_field
+from integration.translation.runner import assert_translation
+
+GEMINI_3_5_FLASH_TEMPERATURE_TEST_CASE: Final = replace(
+    GEMINI_3_5_FLASH_TEST_CASE,
+    scenario="temperature",
+    litellm_request={**GEMINI_3_5_FLASH_TEST_CASE.litellm_request, "temperature": 0.37},
+    expected_provider_request=with_field(
+        GEMINI_3_5_FLASH_TEST_CASE.expected_provider_request, ("generationConfig", "temperature"), 0.37
+    ),
+    expected_litellm_response={**GEMINI_3_5_FLASH_TEST_CASE.expected_litellm_response, "temperature": 0.37},
+)
+GEMINI_3_5_FLASH_TOP_P_TEST_CASE: Final = replace(
+    GEMINI_3_5_FLASH_TEST_CASE,
+    scenario="top_p",
+    litellm_request={**GEMINI_3_5_FLASH_TEST_CASE.litellm_request, "top_p": 0.83},
+    expected_provider_request=with_field(
+        GEMINI_3_5_FLASH_TEST_CASE.expected_provider_request, ("generationConfig", "top_p"), 0.83
+    ),
+    expected_litellm_response={**GEMINI_3_5_FLASH_TEST_CASE.expected_litellm_response, "top_p": 0.83},
+)
+GEMINI_3_5_FLASH_SERVICE_TIER_TEST_CASE: Final = replace(
+    GEMINI_3_5_FLASH_TEST_CASE,
+    scenario="service_tier",
+    litellm_request={**GEMINI_3_5_FLASH_TEST_CASE.litellm_request, "service_tier": "flex"},
+    expected_provider_request=with_field(
+        GEMINI_3_5_FLASH_TEST_CASE.expected_provider_request, ("serviceTier",), "flex"
+    ),
+)
+
+CASES: Final = (
+    GEMINI_3_5_FLASH_TEMPERATURE_TEST_CASE,
+    GEMINI_3_5_FLASH_TOP_P_TEST_CASE,
+    GEMINI_3_5_FLASH_SERVICE_TIER_TEST_CASE,
+)
+
+
+@pytest.mark.parametrize("case", CASES, ids=lambda case: case.id)
+def test_responses_params_gemini(case: TranslationTestCase, gateway: Gateway, provider: SharedProvider) -> None:
+    assert_translation(case, gateway, provider)
diff --git a/tests/integration/translation/responses/params/test_responses_params_openai.py b/tests/integration/translation/responses/params/test_responses_params_openai.py
new file mode 100644
index 00000000000..8fc6235c008
--- /dev/null
+++ b/tests/integration/translation/responses/params/test_responses_params_openai.py
@@ -0,0 +1,120 @@
+from dataclasses import replace
+from typing import Final
+
+import pytest
+from integration._support.client import Gateway
+from integration._support.provider import SharedProvider
+from integration.translation.case import TranslationTestCase
+from integration.translation.responses.bases.openai import GPT_5_4_TEST_CASE
+from integration.translation.params import with_field
+from integration.translation.runner import assert_translation
+
+GPT_5_4_TEMPERATURE_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="temperature",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "temperature": 0.37},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("temperature",), 0.37),
+)
+GPT_5_4_TOP_P_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="top_p",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "top_p": 0.83},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("top_p",), 0.83),
+)
+GPT_5_4_METADATA_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="metadata",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "metadata": {"trace_id": "meta-sentinel-01"}},
+    expected_provider_request=with_field(
+        GPT_5_4_TEST_CASE.expected_provider_request, ("metadata", "trace_id"), "meta-sentinel-01"
+    ),
+)
+GPT_5_4_USER_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="user",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "user": "user-sentinel-01"},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("user",), "user-sentinel-01"),
+)
+GPT_5_4_SAFETY_IDENTIFIER_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="safety_identifier",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "safety_identifier": "safety-sentinel-01"},
+    expected_provider_request=with_field(
+        GPT_5_4_TEST_CASE.expected_provider_request, ("safety_identifier",), "safety-sentinel-01"
+    ),
+)
+GPT_5_4_PROMPT_CACHE_KEY_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="prompt_cache_key",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "prompt_cache_key": "pck-sentinel-01"},
+    expected_provider_request=with_field(
+        GPT_5_4_TEST_CASE.expected_provider_request, ("prompt_cache_key",), "pck-sentinel-01"
+    ),
+)
+GPT_5_4_TEXT_VERBOSITY_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="text_verbosity",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "text": {"verbosity": "low"}},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("text", "verbosity"), "low"),
+)
+GPT_5_4_STORE_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="store",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "store": False},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("store",), False),
+)
+GPT_5_4_INCLUDE_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="include",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "include": ["reasoning.encrypted_content"]},
+    expected_provider_request=with_field(
+        GPT_5_4_TEST_CASE.expected_provider_request, ("include",), ["reasoning.encrypted_content"]
+    ),
+)
+GPT_5_4_TRUNCATION_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="truncation",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "truncation": "auto"},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("truncation",), "auto"),
+)
+GPT_5_4_SERVICE_TIER_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="service_tier",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "service_tier": "flex"},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("service_tier",), "flex"),
+)
+GPT_5_4_TOP_LOGPROBS_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="top_logprobs",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "top_logprobs": 3},
+    expected_provider_request=with_field(GPT_5_4_TEST_CASE.expected_provider_request, ("top_logprobs",), 3),
+)
+GPT_5_4_PROMPT_CACHE_RETENTION_TEST_CASE: Final = replace(
+    GPT_5_4_TEST_CASE,
+    scenario="prompt_cache_retention",
+    litellm_request={**GPT_5_4_TEST_CASE.litellm_request, "prompt_cache_retention": "24h"},
+    expected_provider_request=with_field(
+        GPT_5_4_TEST_CASE.expected_provider_request, ("prompt_cache_retention",), "24h"
+    ),
+)
+
+CASES: Final = (
+    GPT_5_4_TEMPERATURE_TEST_CASE,
+    GPT_5_4_TOP_P_TEST_CASE,
+    GPT_5_4_METADATA_TEST_CASE,
+    GPT_5_4_USER_TEST_CASE,
+    GPT_5_4_SAFETY_IDENTIFIER_TEST_CASE,
+    GPT_5_4_PROMPT_CACHE_KEY_TEST_CASE,
+    GPT_5_4_TEXT_VERBOSITY_TEST_CASE,
+    GPT_5_4_STORE_TEST_CASE,
+    GPT_5_4_INCLUDE_TEST_CASE,
+    GPT_5_4_TRUNCATION_TEST_CASE,
+    GPT_5_4_SERVICE_TIER_TEST_CASE,
+    GPT_5_4_TOP_LOGPROBS_TEST_CASE,
+    GPT_5_4_PROMPT_CACHE_RETENTION_TEST_CASE,
+)
+
+
+@pytest.mark.parametrize("case", CASES, ids=lambda case: case.id)
+def test_responses_params_openai(case: TranslationTestCase, gateway: Gateway, provider: SharedProvider) -> None:
+    assert_translation(case, gateway, provider)