fix: support custom model naming prefixes for anthropic provider (#5893)

lib/crewai/src/crewai/llm.py

@@ -508,8 +508,11 @@ def _matches_provider_pattern(cls, model: str, provider: str) -> bool:
             )
 
         if provider == "anthropic" or provider == "claude":
-            return any(
-                model_lower.startswith(prefix) for prefix in ["claude-", "anthropic."]
+            # Match standard prefixes and any model containing "claude" or "anthropic"
+            # to support custom deployments with non-standard naming (e.g., "anthropic--claude-...")
+            return (
+                "claude" in model_lower
+                or "anthropic" in model_lower
             )
 
         if provider == "gemini" or provider == "google":
@@ -619,6 +622,18 @@ def _infer_provider_from_model(cls, model: str) -> str:
         if model in AZURE_MODELS:
             return "azure"
 
+        # Pattern-based inference for custom deployments
+        model_lower = model.lower()
+        if "claude" in model_lower or "anthropic" in model_lower:
+            return "anthropic"
+        if any(
+            model_lower.startswith(prefix)
+            for prefix in ["gpt-", "o1", "o3", "o4", "whisper-"]
+        ):
+            return "openai"
+        if "gemini" in model_lower:
+            return "gemini"
+
         return "openai"
 
     @classmethod
@@ -702,8 +717,8 @@ def _is_anthropic_model(model: str) -> bool:
         Returns:
             bool: True if the model is from Anthropic, False otherwise.
         """
-        anthropic_prefixes = ("anthropic/", "claude-", "claude/")
-        return any(prefix in model.lower() for prefix in anthropic_prefixes)
+        model_lower = model.lower()
+        return "claude" in model_lower or "anthropic" in model_lower
 
     def _prepare_completion_params(
         self,

lib/crewai/tests/test_llm.py

@@ -1177,3 +1177,27 @@ async def _ret(*args, **kwargs):
     assert isinstance(result, list)
     assert len(result) == 1
     assert result[0].function.name == "search"
+
+
+class TestModelPrefixFiltering:
+    """Test that model prefix filtering supports custom deployments."""
+
+    def test_anthropic_custom_prefix(self):
+        """Models with 'anthropic--claude' prefix should be recognized."""
+        from crewai.llm import LLM
+        assert LLM._matches_provider_pattern("anthropic--claude-3-sonnet", "anthropic")
+
+    def test_anthropic_standard_prefix(self):
+        """Standard claude- prefix should still work."""
+        from crewai.llm import LLM
+        assert LLM._matches_provider_pattern("claude-3-sonnet", "anthropic")
+
+    def test_anthropic_dot_prefix(self):
+        """Standard anthropic. prefix should still work."""
+        from crewai.llm import LLM
+        assert LLM._matches_provider_pattern("anthropic.claude-3-sonnet", "anthropic")
+
+    def test_infer_anthropic_from_custom_name(self):
+        """Should infer anthropic provider from custom model names."""
+        from crewai.llm import LLM
+        assert LLM._infer_provider_from_model("anthropic--claude-3-sonnet") == "anthropic"