From 5aff0e4da6175e1cbfba7a2a3f7b135c065c0c92 Mon Sep 17 00:00:00 2001
From: Chesars <cesarponce19544@gmail.com>
Date: Thu, 26 Feb 2026 17:25:23 -0300
Subject: [PATCH] refactor: move _is_claude_4_6_model to AnthropicModelInfo,
 use explicit effort_map

- Move _is_claude_4_6_model from AnthropicConfig to AnthropicModelInfo
  to eliminate duplicated logic in is_effort_used
- Use explicit effort_map dict instead of passing unknown values through
  to output_config
---
 litellm/llms/anthropic/chat/transformation.py | 25 +++----------------
 litellm/llms/anthropic/common_utils.py        | 25 +++++++++++--------
 2 files changed, 18 insertions(+), 32 deletions(-)

diff --git a/litellm/llms/anthropic/chat/transformation.py b/litellm/llms/anthropic/chat/transformation.py
index 2185890b338..17b5afb8437 100644
--- a/litellm/llms/anthropic/chat/transformation.py
+++ b/litellm/llms/anthropic/chat/transformation.py
@@ -168,24 +168,6 @@ class AnthropicConfig(AnthropicModelInfo, BaseConfig):
             tool_call["caller"] = cast(Dict[str, Any], anthropic_tool_content["caller"])  # type: ignore[typeddict-item]
         return tool_call
 
-    @staticmethod
-    def _is_claude_4_6_model(model: str) -> bool:
-        """Check if the model is a Claude 4.6 model that uses adaptive thinking."""
-        model_lower = model.lower()
-        return any(
-            model_variant in model_lower
-            for model_variant in (
-                "opus-4-6",
-                "opus_4_6",
-                "opus-4.6",
-                "opus_4.6",
-                "sonnet-4-6",
-                "sonnet_4_6",
-                "sonnet-4.6",
-                "sonnet_4.6",
-            )
-        )
-
     @staticmethod
     def _is_opus_4_6_model(model: str) -> bool:
         """Check if the model is specifically Claude Opus 4.6."""
@@ -1017,9 +999,10 @@ class AnthropicConfig(AnthropicModelInfo, BaseConfig):
                 )
                 if AnthropicConfig._is_claude_4_6_model(model):
                     # Map reasoning_effort to Anthropic's output_config for 4.6 models
-                    # "minimal" has no Anthropic equivalent → map to "low"
-                    anthropic_effort = value if value != "minimal" else "low"
-                    optional_params["output_config"] = {"effort": anthropic_effort}
+                    effort_map = {"minimal": "low", "low": "low", "medium": "medium", "high": "high", "max": "max"}
+                    anthropic_effort = effort_map.get(value)
+                    if anthropic_effort is not None:
+                        optional_params["output_config"] = {"effort": anthropic_effort}
             elif param == "web_search_options" and isinstance(value, dict):
                 hosted_web_search_tool = self.map_web_search_tool(
                     cast(OpenAIWebSearchOptions, value)
diff --git a/litellm/llms/anthropic/common_utils.py b/litellm/llms/anthropic/common_utils.py
index bf6a7bd63ca..a1a47daf6d4 100644
--- a/litellm/llms/anthropic/common_utils.py
+++ b/litellm/llms/anthropic/common_utils.py
@@ -224,6 +224,18 @@ class AnthropicModelInfo(BaseLLMModelInfo):
 
         return False
 
+    @staticmethod
+    def _is_claude_4_6_model(model: str) -> bool:
+        """Check if the model is a Claude 4.6 model (Opus 4.6 or Sonnet 4.6)."""
+        model_lower = model.lower()
+        return any(
+            v in model_lower
+            for v in (
+                "opus-4-6", "opus_4_6", "opus-4.6", "opus_4.6",
+                "sonnet-4-6", "sonnet_4_6", "sonnet-4.6", "sonnet_4.6",
+            )
+        )
+
     def is_effort_used(
         self, optional_params: Optional[dict], model: Optional[str] = None
     ) -> bool:
@@ -238,17 +250,8 @@ class AnthropicModelInfo(BaseLLMModelInfo):
             return False
 
         # Claude 4.6 models use output_config as a stable API feature — no beta header needed
-        if model:
-            model_lower = model.lower()
-            is_4_6 = any(
-                v in model_lower
-                for v in (
-                    "opus-4-6", "opus_4_6", "opus-4.6", "opus_4.6",
-                    "sonnet-4-6", "sonnet_4_6", "sonnet-4.6", "sonnet_4.6",
-                )
-            )
-            if is_4_6:
-                return False
+        if model and self._is_claude_4_6_model(model):
+            return False
 
         # Check if reasoning_effort is provided for Claude Opus 4.5
         if model and ("opus-4-5" in model.lower() or "opus_4_5" in model.lower()):