diff --git a/litellm/llms/tencent/chat/transformation.py b/litellm/llms/tencent/chat/transformation.py
index b1672d93542..7e80b0012df 100644
--- a/litellm/llms/tencent/chat/transformation.py
+++ b/litellm/llms/tencent/chat/transformation.py
@@ -3,14 +3,36 @@ Translates from OpenAI's `/v1/chat/completions` to Tencent TokenHub's
 OpenAI-compatible endpoint.
 """
 
-from typing import Final
+from collections.abc import Mapping
+from typing import Final, TypedDict
 
+from typing_extensions import ReadOnly
+
+import litellm
 from litellm.secret_managers.main import get_secret_str
 from litellm.utils import supports_reasoning
 
 from ...openai.chat.gpt_transformation import OpenAIGPTConfig
 
 
+class ThinkingPayload(TypedDict, total=False):
+    """Tencent TokenHub `thinking` object.
+
+    `type` ("enabled"/"disabled"/"adaptive") is required by TokenHub when the
+    object is passed; `budget_tokens` is auto-filled server-side when omitted.
+    Ref: https://www.tencentcloud.com/document/product/1300/82345
+    """
+
+    type: ReadOnly[str]
+    budget_tokens: ReadOnly[int]
+
+
+class ThinkingExtraBody(TypedDict, total=False):
+    """`extra_body` payload carrying TokenHub's `thinking` object."""
+
+    thinking: ReadOnly[Mapping[str, object]]
+
+
 class TencentChatConfig(OpenAIGPTConfig):
     def get_supported_openai_params(self, model: str) -> list:
         params: Final = super().get_supported_openai_params(model)
@@ -25,18 +47,71 @@ class TencentChatConfig(OpenAIGPTConfig):
         model: str,
         drop_params: bool,
     ) -> dict:
-        optional_params = super().map_openai_params(non_default_params, optional_params, model, drop_params)
+        mapped_params: Final = super().map_openai_params(non_default_params, optional_params, model, drop_params)
 
-        thinking_value: Final = optional_params.pop("thinking", None)
-        reasoning_effort: Final = optional_params.pop("reasoning_effort", None)
+        thinking_value: Final = mapped_params.pop("thinking", None)
+        reasoning_effort: Final = mapped_params.pop("reasoning_effort", None)
 
-        if thinking_value is not None:
-            if isinstance(thinking_value, dict):
-                optional_params["thinking"] = thinking_value
-        elif reasoning_effort is not None and reasoning_effort != "none":
-            optional_params["thinking"] = {"type": "enabled"}
+        thinking: Final = self._resolve_thinking_payload(
+            model=model,
+            thinking_value=thinking_value,  # pyright: ignore[reportUnknownArgumentType]  # value popped from the untyped provider params dict
+            reasoning_effort=reasoning_effort,  # pyright: ignore[reportUnknownArgumentType]  # value popped from the untyped provider params dict
+        )
+        if thinking is not None:
+            # TokenHub expects `thinking` in the request JSON body, but the
+            # OpenAI SDK's chat.completions.create() rejects unknown top-level
+            # kwargs, so it travels via `extra_body`, which the SDK merges into
+            # the payload. A plain assignment is merge-safe: get_optional_params
+            # spreads this dict into its own extra_body assembly downstream.
+            extra_body: Final[ThinkingExtraBody] = {"thinking": thinking}
+            mapped_params["extra_body"] = extra_body
+        return mapped_params
 
-        return optional_params
+    @classmethod
+    def _resolve_thinking_payload(
+        cls,
+        model: str,
+        thinking_value: object,
+        reasoning_effort: object,
+    ) -> Mapping[str, object] | None:
+        if isinstance(thinking_value, dict):
+            return cls._coerce_thinking_type_for_model(model=model, thinking=thinking_value)  # pyright: ignore[reportUnknownArgumentType]  # isinstance narrows to dict[Unknown, Unknown] out of the untyped provider params dict
+        if isinstance(reasoning_effort, str):
+            # TokenHub recommends explicitly disabling thinking rather than
+            # relying on per-model defaults (deepseek-v4-* default to enabled).
+            payload: Final[ThinkingPayload] = {"type": "disabled" if reasoning_effort == "none" else "enabled"}
+            return cls._coerce_thinking_type_for_model(model=model, thinking=payload)
+        return None
+
+    @staticmethod
+    def _coerce_thinking_type_for_model(model: str, thinking: Mapping[str, object]) -> Mapping[str, object]:
+        """Coerce `thinking.type` to a value the model accepts.
+
+        MiniMax models on TokenHub only accept "adaptive"/"disabled" and reject
+        "enabled" with a 400; "adaptive" (the model decides when to think) is
+        the closest semantic, so "enabled" is coerced for them. The capability
+        is read from the model map's `supports_adaptive_thinking` flag, so
+        aliases and newly onboarded adaptive-only models need no code change.
+        Ref: https://www.tencentcloud.com/document/product/1300/82345
+        """
+        if thinking.get("type") != "enabled" or not TencentChatConfig._is_adaptive_thinking_model(model):
+            return thinking
+
+        budget: Final[object] = thinking.get("budget_tokens")
+        if isinstance(budget, int):
+            coerced_with_budget: Final[ThinkingPayload] = {"type": "adaptive", "budget_tokens": budget}
+            return coerced_with_budget
+        coerced: Final[ThinkingPayload] = {"type": "adaptive"}
+        return coerced
+
+    @staticmethod
+    def _is_adaptive_thinking_model(model: str) -> bool:
+        """Read `supports_adaptive_thinking` from the model map under tencent."""
+        try:
+            model_info: Final[Mapping[str, object]] = litellm.get_model_info(model=model, custom_llm_provider="tencent")
+        except Exception:  # noqa: BLE001  # get_model_info raises a bare Exception for unmapped models
+            return False
+        return model_info.get("supports_adaptive_thinking") is True
 
     def _get_openai_compatible_provider_info(
         self, api_base: str | None, api_key: str | None
diff --git a/litellm/model_prices_and_context_window_backup.json b/litellm/model_prices_and_context_window_backup.json
index 77572f69b8b..9dd0382a185 100644
--- a/litellm/model_prices_and_context_window_backup.json
+++ b/litellm/model_prices_and_context_window_backup.json
@@ -51102,6 +51102,26 @@
         "supports_reasoning": true,
         "supports_vision": false
     },
+    "tencent/minimax-m3": {
+        "cache_creation_input_token_cost": 0.0,
+        "cache_read_input_token_cost": 6e-08,
+        "input_cost_per_token": 3e-07,
+        "input_cost_per_token_cache_hit": 6e-08,
+        "litellm_provider": "tencent",
+        "max_input_tokens": 1000000,
+        "mode": "chat",
+        "output_cost_per_token": 1.2e-06,
+        "source": "https://www.tencentcloud.com/products/tokenhub",
+        "supported_endpoints": [
+            "/v1/chat/completions"
+        ],
+        "supports_adaptive_thinking": true,
+        "supports_function_calling": true,
+        "supports_native_streaming": true,
+        "supports_prompt_caching": true,
+        "supports_reasoning": true,
+        "supports_vision": false
+    },
     "cognition/swe-1.6": {
         "input_cost_per_token": 5e-07,
         "output_cost_per_token": 2.5e-06,
diff --git a/model_prices_and_context_window.json b/model_prices_and_context_window.json
index 77572f69b8b..9dd0382a185 100644
--- a/model_prices_and_context_window.json
+++ b/model_prices_and_context_window.json
@@ -51102,6 +51102,26 @@
         "supports_reasoning": true,
         "supports_vision": false
     },
+    "tencent/minimax-m3": {
+        "cache_creation_input_token_cost": 0.0,
+        "cache_read_input_token_cost": 6e-08,
+        "input_cost_per_token": 3e-07,
+        "input_cost_per_token_cache_hit": 6e-08,
+        "litellm_provider": "tencent",
+        "max_input_tokens": 1000000,
+        "mode": "chat",
+        "output_cost_per_token": 1.2e-06,
+        "source": "https://www.tencentcloud.com/products/tokenhub",
+        "supported_endpoints": [
+            "/v1/chat/completions"
+        ],
+        "supports_adaptive_thinking": true,
+        "supports_function_calling": true,
+        "supports_native_streaming": true,
+        "supports_prompt_caching": true,
+        "supports_reasoning": true,
+        "supports_vision": false
+    },
     "cognition/swe-1.6": {
         "input_cost_per_token": 5e-07,
         "output_cost_per_token": 2.5e-06,
diff --git a/tests/test_litellm/llms/tencent/chat/test_tencent_chat_transformation.py b/tests/test_litellm/llms/tencent/chat/test_tencent_chat_transformation.py
index 00a82041c20..9f510786d50 100644
--- a/tests/test_litellm/llms/tencent/chat/test_tencent_chat_transformation.py
+++ b/tests/test_litellm/llms/tencent/chat/test_tencent_chat_transformation.py
@@ -45,7 +45,8 @@ def test_map_openai_params_passes_thinking_dict_through():
             drop_params=False,
         )
 
-    assert result["thinking"] == {"type": "enabled", "budget_tokens": 1024}
+    assert "thinking" not in result
+    assert result["extra_body"]["thinking"] == {"type": "enabled", "budget_tokens": 1024}
 
 
 def test_map_openai_params_converts_reasoning_effort_to_thinking():
@@ -61,10 +62,11 @@ def test_map_openai_params_converts_reasoning_effort_to_thinking():
             drop_params=False,
         )
 
-    assert result["thinking"] == {"type": "enabled"}
+    assert "thinking" not in result
+    assert result["extra_body"]["thinking"] == {"type": "enabled"}
 
 
-def test_map_openai_params_drops_none_reasoning_effort():
+def test_map_openai_params_none_reasoning_effort_disables_thinking():
     config = TencentChatConfig()
     with patch(
         "litellm.llms.tencent.chat.transformation.supports_reasoning",
@@ -78,6 +80,7 @@ def test_map_openai_params_drops_none_reasoning_effort():
         )
 
     assert "thinking" not in result
+    assert result["extra_body"]["thinking"] == {"type": "disabled"}
     assert "reasoning_effort" not in result
 
 
@@ -97,7 +100,8 @@ def test_map_openai_params_thinking_priority_over_reasoning_effort():
             drop_params=False,
         )
 
-    assert result["thinking"] == {"type": "enabled", "budget_tokens": 2048}
+    assert "thinking" not in result
+    assert result["extra_body"]["thinking"] == {"type": "enabled", "budget_tokens": 2048}
 
 
 def test_map_openai_params_extracts_thinking_and_effort_from_optional_params():
@@ -109,10 +113,157 @@ def test_map_openai_params_extracts_thinking_and_effort_from_optional_params():
         drop_params=False,
     )
 
-    assert "thinking" in result
+    assert "thinking" not in result
+    assert result["extra_body"]["thinking"] == {"type": "enabled"}
     assert "reasoning_effort" not in result
 
 
+def test_map_openai_params_overwrites_existing_extra_body():
+    """The map layer assigns extra_body directly; get_optional_params merges it
+    with user-supplied extra params downstream (utils.py provider overrides)."""
+    config = TencentChatConfig()
+    result = config.map_openai_params(
+        non_default_params={},
+        optional_params={
+            "thinking": {"type": "enabled"},
+            "extra_body": {"custom_flag": True},
+        },
+        model="tencent/deepseek-v4-pro",
+        drop_params=False,
+    )
+
+    assert result["extra_body"] == {"thinking": {"type": "enabled"}}
+
+
+def test_get_optional_params_merges_thinking_with_user_extra_body(local_model_cost_map):
+    """End-to-end at the get_optional_params layer: a user-supplied extra_body
+    and the mapped thinking payload must coexist in the final extra_body."""
+    from litellm.utils import get_optional_params
+
+    result = get_optional_params(
+        model="tencent/deepseek-v4-pro",
+        custom_llm_provider="tencent",
+        messages=[{"role": "user", "content": "hi"}],
+        thinking={"type": "enabled"},
+        extra_body={"custom_flag": True},
+    )
+
+    assert result["extra_body"]["thinking"] == {"type": "enabled"}
+    assert result["extra_body"]["custom_flag"] is True
+
+
+def test_transform_request_never_passes_thinking_as_top_level_kwarg():
+    """
+    Regression test: tencent routes through the OpenAI SDK's
+    chat.completions.create(**data), which raises TypeError on unknown kwargs.
+    `thinking` must be nested inside extra_body, never top-level.
+    """
+    config = TencentChatConfig()
+    optional_params = config.map_openai_params(
+        non_default_params={"thinking": {"type": "enabled", "budget_tokens": 1024}},
+        optional_params={},
+        model="tencent/deepseek-v4-pro",
+        drop_params=False,
+    )
+
+    data = config.transform_request(
+        model="deepseek-v4-pro",
+        messages=[{"role": "user", "content": "hi"}],
+        optional_params=optional_params,
+        litellm_params={},
+        headers={},
+    )
+
+    assert "thinking" not in data
+    assert data["extra_body"]["thinking"] == {"type": "enabled", "budget_tokens": 1024}
+
+
+class TestAdaptiveThinkingCoercion:
+    """
+    Models flagged `supports_adaptive_thinking` in the cost map (e.g.
+    tencent/minimax-m3) only accept thinking.type "adaptive"/"disabled" —
+    "enabled" returns a 400 from TokenHub.
+    Ref: https://www.tencentcloud.com/document/product/1300/82345
+    """
+
+    def test_reasoning_effort_maps_to_adaptive_for_adaptive_only_model(self, local_model_cost_map):
+        config = TencentChatConfig()
+        result = config.map_openai_params(
+            non_default_params={"reasoning_effort": "medium"},
+            optional_params={},
+            model="tencent/minimax-m3",
+            drop_params=False,
+        )
+
+        assert result["extra_body"]["thinking"] == {"type": "adaptive"}
+
+    def test_explicit_enabled_thinking_coerced_to_adaptive(self, local_model_cost_map):
+        config = TencentChatConfig()
+        result = config.map_openai_params(
+            non_default_params={"thinking": {"type": "enabled", "budget_tokens": 4096}},
+            optional_params={},
+            model="tencent/minimax-m3",
+            drop_params=False,
+        )
+
+        assert result["extra_body"]["thinking"] == {"type": "adaptive", "budget_tokens": 4096}
+
+    def test_disabled_thinking_kept_for_adaptive_only_model(self, local_model_cost_map):
+        config = TencentChatConfig()
+        result = config.map_openai_params(
+            non_default_params={"thinking": {"type": "disabled"}},
+            optional_params={},
+            model="tencent/minimax-m3",
+            drop_params=False,
+        )
+
+        assert result["extra_body"]["thinking"] == {"type": "disabled"}
+
+    def test_none_reasoning_effort_disables_thinking_for_adaptive_only_model(self, local_model_cost_map):
+        config = TencentChatConfig()
+        result = config.map_openai_params(
+            non_default_params={"reasoning_effort": "none"},
+            optional_params={},
+            model="tencent/minimax-m3",
+            drop_params=False,
+        )
+
+        assert result["extra_body"]["thinking"] == {"type": "disabled"}
+
+    def test_non_adaptive_model_keeps_enabled(self, local_model_cost_map):
+        config = TencentChatConfig()
+        result = config.map_openai_params(
+            non_default_params={"reasoning_effort": "high"},
+            optional_params={},
+            model="tencent/deepseek-v4-pro",
+            drop_params=False,
+        )
+
+        assert result["extra_body"]["thinking"] == {"type": "enabled"}
+
+    def test_unmapped_model_keeps_enabled(self):
+        """Models absent from the cost map never get coerced."""
+        config = TencentChatConfig()
+        assert config._is_adaptive_thinking_model("tencent/no-such-model") is False
+
+
+def test_minimax_m3_cost_map_entry_marks_adaptive_thinking():
+    """The capability flag driving the coercion must exist in the cost map
+    (and its backup, which is shipped with the package)."""
+    import json
+    from pathlib import Path
+
+    repo_root = Path(__file__).parents[5]
+    for filename in ("model_prices_and_context_window.json", "litellm/model_prices_and_context_window_backup.json"):
+        with open(repo_root / filename) as f:
+            entry = json.load(f).get("tencent/minimax-m3")
+
+        assert entry is not None, f"tencent/minimax-m3 not found in {filename}"
+        assert entry["litellm_provider"] == "tencent"
+        assert entry.get("supports_adaptive_thinking") is True
+        assert entry.get("supports_reasoning") is True
+
+
 def test_get_complete_url_default():
     config = TencentChatConfig()
 
diff --git a/tests/test_litellm/test_utils.py b/tests/test_litellm/test_utils.py
index e9b2851f717..92033251b13 100644
--- a/tests/test_litellm/test_utils.py
+++ b/tests/test_litellm/test_utils.py
@@ -4271,7 +4271,11 @@ class TestGetOptionalParamsTencent:
     """Tests that tencent provider uses TencentChatConfig for parameter mapping."""
 
     def test_tencent_supports_thinking_param(self):
-        """Verify get_optional_params for tencent accepts the 'thinking' param."""
+        """Verify get_optional_params for tencent accepts the 'thinking' param.
+
+        `thinking` must be nested in extra_body: tencent routes through the
+        OpenAI SDK's chat.completions.create(), which rejects unknown kwargs.
+        """
         from unittest.mock import patch
 
         from litellm.utils import get_optional_params
@@ -4285,7 +4289,8 @@ class TestGetOptionalParamsTencent:
                 custom_llm_provider="tencent",
                 thinking={"type": "enabled"},
             )
-        assert result.get("thinking") == {"type": "enabled"}
+        assert "thinking" not in result
+        assert result["extra_body"]["thinking"] == {"type": "enabled"}
 
     def test_tencent_supports_reasoning_effort(self):
         """Verify get_optional_params for tencent converts reasoning_effort to thinking."""
@@ -4302,7 +4307,8 @@ class TestGetOptionalParamsTencent:
                 custom_llm_provider="tencent",
                 reasoning_effort="medium",
             )
-        assert result.get("thinking") == {"type": "enabled"}
+        assert "thinking" not in result
+        assert result["extra_body"]["thinking"] == {"type": "enabled"}
 
     def test_tencent_supported_params_includes_thinking_and_reasoning_effort(self):
         """Verify get_supported_openai_params for tencent includes custom params."""