feat(anthropic): support native JSON mode for Claude 4.7 and audit max_completion_tokens

litellm/llms/anthropic/chat/transformation.py

@@ -1054,6 +1054,13 @@ class AnthropicConfig(AnthropicModelInfo, BaseConfig):
                         "sonnet-4-6",
                         "sonnet_4.6",
                         "sonnet_4_6",
+                        "sonnet-4.7",
+                        "sonnet-4-7",
+                        "sonnet_4.7",
+                        "sonnet_4_7",
+                        "4.7-sonnet",
+                        "4-7-sonnet",
+                        "4_7_sonnet",
                     }
                 ):
                     _output_format = (

tests/test_litellm/test_parity_gap.py

@@ -0,0 +1,71 @@
+
+import pytest
+from litellm.llms.anthropic.chat.transformation import AnthropicConfig
+
+def test_anthropic_response_format_parity_claude_4_7():
+    """
+    Test that Claude 4.7 correctly maps response_format to native output_format.
+    """
+    config = AnthropicConfig()
+    
+    # Test with Claude 4.7 Sonnet - typical model name format
+    model = "claude-4-7-sonnet-20261031"
+    non_default_params = {
+        "response_format": {
+            "type": "json_schema",
+            "json_schema": {
+                "name": "test",
+                "schema": {"type": "object", "properties": {"foo": {"type": "string"}}}
+            }
+        }
+    }
+    optional_params = {}
+    
+    mapped_params = config.map_openai_params(
+        non_default_params=non_default_params,
+        optional_params=optional_params,
+        model=model,
+        drop_params=False
+    )
+    
+    # Verify it uses native output_format
+    assert "output_format" in mapped_params, f"Claude 4.7 should use native output_format, but it was not found in {mapped_params.keys()}"
+    assert mapped_params["output_format"]["type"] == "json_schema"
+    assert "tool_choice" not in mapped_params or mapped_params["tool_choice"]["type"] != "tool", "Should not fall back to tool calling for JSON mode on Claude 4.7"
+
+def test_anthropic_max_completion_tokens_parity():
+    """
+    Test that max_completion_tokens correctly maps to max_tokens for Anthropic.
+    """
+    config = AnthropicConfig()
+    model = "claude-3-5-sonnet-20240620"
+    non_default_params = {"max_completion_tokens": 500}
+    optional_params = {}
+    
+    mapped_params = config.map_openai_params(
+        non_default_params=non_default_params,
+        optional_params=optional_params,
+        model=model,
+        drop_params=False
+    )
+    
+    assert mapped_params["max_tokens"] == 500
+
+def test_bedrock_max_completion_tokens_parity():
+    """
+    Test that max_completion_tokens correctly maps to maxTokens for Bedrock.
+    """
+    from litellm.llms.bedrock.chat.converse_transformation import AmazonConverseConfig
+    config = AmazonConverseConfig()
+    model = "anthropic.claude-3-5-sonnet-v1:0"
+    non_default_params = {"max_completion_tokens": 750}
+    optional_params = {}
+    
+    mapped_params = config.map_openai_params(
+        non_default_params=non_default_params,
+        optional_params=optional_params,
+        model=model,
+        drop_params=False
+    )
+    
+    assert mapped_params["maxTokens"] == 750