From 6cd19b7a14165de82dc9409710abb06ac7cd3888 Mon Sep 17 00:00:00 2001
From: Junead <juneadjunead84@gmail.com>
Date: Wed, 28 Oct 2026 15:56:49 +0530
Subject: [PATCH] fix(utils): resolve model info for responses and
 chat_completions selectors

---
 litellm/utils.py                        | 16 +++++++
 tests/unit/test_utils_get_model_info.py | 64 +++++++++++++++++++++++++
 2 files changed, 80 insertions(+)

diff --git a/litellm/utils.py b/litellm/utils.py
index 1e095966a43..e2a33ffd743 100644
--- a/litellm/utils.py
+++ b/litellm/utils.py
@@ -6417,7 +6417,23 @@ def _strip_mantle_region_prefix(model: str) -> str:
     return split_mantle_region_prefix(model)[1]
 
 
+_API_SELECTOR_SEGMENTS: Final = frozenset({"responses", "chat_completions"})
+
+
+def _without_api_selector_segment(model: str) -> str:
+    segments: Final = model.split("/")
+    selector_index: Final = 1 if segments[0] in LlmProvidersSet else 0
+    has_selector: Final = len(segments) > selector_index + 1 and segments[selector_index] in _API_SELECTOR_SEGMENTS
+    return "/".join((*segments[:selector_index], *segments[selector_index + 1 :])) if has_selector else model
+
+
 def get_potential_model_names(model: str, custom_llm_provider: str | None) -> PotentialModelNamesAndCustomLLMProvider:
+    return _potential_model_names_for(
+        model=_without_api_selector_segment(model), custom_llm_provider=custom_llm_provider
+    )
+
+
+def _potential_model_names_for(model: str, custom_llm_provider: str | None) -> PotentialModelNamesAndCustomLLMProvider:
     if custom_llm_provider is None:
         # Get custom_llm_provider
         try:
diff --git a/tests/unit/test_utils_get_model_info.py b/tests/unit/test_utils_get_model_info.py
index 302a7d60cdd..6ffd59ef48f 100644
--- a/tests/unit/test_utils_get_model_info.py
+++ b/tests/unit/test_utils_get_model_info.py
@@ -576,3 +576,67 @@ def test_get_model_info_huggingface_models(monkeypatch):
         providers=["huggingface"],
         **info,
     )
+
+
+_SELECTOR_PROBE_INPUT_COST: Final = 0.001
+_SELECTOR_PROBE_OUTPUT_COST: Final = 0.002
+
+
+def _registry_fields(info: Mapping[str, object]) -> dict[str, object]:
+    return {name: value for name, value in info.items() if name != "supported_openai_params"}
+
+
+def _register_selector_probe(provider: str) -> str:
+    litellm.register_model(
+        {
+            f"{provider}/selector-probe-model": {
+                "litellm_provider": provider,
+                "mode": "chat",
+                "max_input_tokens": 4096,
+                "input_cost_per_token": _SELECTOR_PROBE_INPUT_COST,
+                "output_cost_per_token": _SELECTOR_PROBE_OUTPUT_COST,
+            }
+        }
+    )
+    return "selector-probe-model"
+
+
+@pytest.mark.parametrize("selector", ["responses", "chat_completions"])
+@pytest.mark.parametrize("provider", ["openai", "azure"])
+def test_get_model_info_resolves_api_selector_segment_like_the_plain_model(provider: str, selector: str) -> None:
+    model: Final = _register_selector_probe(provider)
+
+    with_selector: Final = litellm.get_model_info(f"{provider}/{selector}/{model}")
+
+    assert _registry_fields(with_selector) == _registry_fields(litellm.get_model_info(f"{provider}/{model}"))
+    assert with_selector["input_cost_per_token"] == _SELECTOR_PROBE_INPUT_COST, with_selector
+
+
+@pytest.mark.parametrize("selector", ["responses", "chat_completions"])
+def test_get_model_info_resolves_leading_api_selector_segment_with_explicit_provider(selector: str) -> None:
+    model: Final = _register_selector_probe("openai")
+
+    with_selector: Final = litellm.get_model_info(f"{selector}/{model}", custom_llm_provider="openai")
+
+    plain: Final = litellm.get_model_info(model, custom_llm_provider="openai")
+
+    assert _registry_fields(with_selector) == _registry_fields(plain)
+
+
+@pytest.mark.parametrize("model", ["gpt-4o", "gpt-6.1-sol"])
+def test_get_model_info_api_selector_segment_does_not_change_a_cost_map_model(model: str) -> None:
+    with_selector: Final = litellm.get_model_info(f"openai/responses/{model}")
+
+    assert _registry_fields(with_selector) == _registry_fields(litellm.get_model_info(f"openai/{model}"))
+    assert "responses" not in with_selector["key"], with_selector
+
+
+def test_cost_per_token_prices_a_model_declared_with_the_responses_selector() -> None:
+    model: Final = _register_selector_probe("openai")
+
+    prompt_cost, completion_cost = litellm.cost_per_token(
+        model=f"openai/responses/{model}", prompt_tokens=1000, completion_tokens=1000
+    )
+
+    assert prompt_cost == pytest.approx(1000 * _SELECTOR_PROBE_INPUT_COST)
+    assert completion_cost == pytest.approx(1000 * _SELECTOR_PROBE_OUTPUT_COST)