feat: route future Claude models to Anthropic provider via pattern matching

Add pattern-based matching for Claude model names so that future models
(e.g., claude-opus-4-9, claude-sonnet-5-0) are automatically routed to
the Anthropic provider without requiring model_prices_and_context_window.json
updates.

The pattern matches: claude-{opus|sonnet|haiku}-{major}-{minor}[-YYYYMMDD]

https://claude.ai/code/session_017asCVDN5jBFMBcZRjiQR6C

litellm/litellm_core_utils/get_llm_provider_logic.py

@@ -71,6 +71,29 @@ def _is_azure_claude_model(model: str) -> bool:
         return False
 
 
+import re
+
+_CLAUDE_PATTERN = re.compile(
+    r"^claude-(?:opus|sonnet|haiku)-\d+-\d+(?:-\d{8})?$", re.IGNORECASE
+)
+
+
+def _matches_claude_model_pattern(model: str) -> bool:
+    """
+    Check if a model string matches the Claude model naming pattern.
+
+    Matches patterns like:
+    - claude-opus-4-7
+    - claude-sonnet-4-6
+    - claude-haiku-4-5
+    - claude-opus-5-1-20270101 (with optional date suffix)
+
+    This allows future Claude models to be routed to the Anthropic provider
+    without requiring updates to model_prices_and_context_window.json.
+    """
+    return _CLAUDE_PATTERN.match(model) is not None
+
+
 def handle_cohere_chat_model_custom_llm_provider(
     model: str, custom_llm_provider: Optional[str] = None
 ) -> Tuple[str, Optional[str]]:
@@ -398,6 +421,9 @@ def get_llm_provider(  # noqa: PLR0915
                 custom_llm_provider = "anthropic_text"
             else:
                 custom_llm_provider = "anthropic"
+        ## anthropic - pattern-based matching for future Claude models
+        elif _matches_claude_model_pattern(model):
+            custom_llm_provider = "anthropic"
         ## cohere
         elif model in litellm.cohere_models or model in litellm.cohere_embedding_models:
             custom_llm_provider = "cohere"

tests/local_testing/test_get_llm_provider.py

@@ -478,3 +478,95 @@ def test_get_llm_provider_use_proxy_arg_true_with_direct_args():
     assert key == arg_api_key  # Should use the argument key
     assert base == arg_api_base  # Should use the argument base
 
+
+# -------- Tests for Claude model pattern matching ---------
+
+
+class TestClaudeModelPatternMatching:
+    """
+    Tests for _matches_claude_model_pattern which routes future Claude models
+    to the Anthropic provider without requiring model_prices_and_context_window.json updates.
+    """
+
+    def test_matches_claude_opus_pattern(self):
+        """Test claude-opus-X-Y pattern matching."""
+        from litellm.litellm_core_utils.get_llm_provider_logic import (
+            _matches_claude_model_pattern,
+        )
+
+        assert _matches_claude_model_pattern("claude-opus-4-7") is True
+        assert _matches_claude_model_pattern("claude-opus-4-9") is True
+        assert _matches_claude_model_pattern("claude-opus-5-1") is True
+
+    def test_matches_claude_sonnet_pattern(self):
+        """Test claude-sonnet-X-Y pattern matching."""
+        from litellm.litellm_core_utils.get_llm_provider_logic import (
+            _matches_claude_model_pattern,
+        )
+
+        assert _matches_claude_model_pattern("claude-sonnet-4-6") is True
+        assert _matches_claude_model_pattern("claude-sonnet-5-0") is True
+
+    def test_matches_claude_haiku_pattern(self):
+        """Test claude-haiku-X-Y pattern matching."""
+        from litellm.litellm_core_utils.get_llm_provider_logic import (
+            _matches_claude_model_pattern,
+        )
+
+        assert _matches_claude_model_pattern("claude-haiku-4-5") is True
+        assert _matches_claude_model_pattern("claude-haiku-5-0") is True
+
+    def test_matches_claude_with_date_suffix(self):
+        """Test claude model pattern with date suffix."""
+        from litellm.litellm_core_utils.get_llm_provider_logic import (
+            _matches_claude_model_pattern,
+        )
+
+        assert _matches_claude_model_pattern("claude-opus-5-1-20270101") is True
+        assert _matches_claude_model_pattern("claude-sonnet-4-7-20260601") is True
+        assert _matches_claude_model_pattern("claude-haiku-4-6-20251201") is True
+
+    def test_rejects_non_claude_models(self):
+        """Test that non-Claude models are not matched."""
+        from litellm.litellm_core_utils.get_llm_provider_logic import (
+            _matches_claude_model_pattern,
+        )
+
+        assert _matches_claude_model_pattern("gpt-4") is False
+        assert _matches_claude_model_pattern("mistral-large") is False
+        assert _matches_claude_model_pattern("llama-3") is False
+
+    def test_rejects_invalid_claude_patterns(self):
+        """Test that invalid Claude model patterns are not matched."""
+        from litellm.litellm_core_utils.get_llm_provider_logic import (
+            _matches_claude_model_pattern,
+        )
+
+        # Wrong order (variant before name)
+        assert _matches_claude_model_pattern("claude-4-opus") is False
+        # Missing version numbers
+        assert _matches_claude_model_pattern("claude-opus") is False
+        # Old format (claude-3-opus instead of claude-opus-3)
+        assert _matches_claude_model_pattern("claude-3-opus-20240229") is False
+        # Invalid variant
+        assert _matches_claude_model_pattern("claude-mini-4-5") is False
+
+    def test_get_llm_provider_future_claude_model(self):
+        """Test that get_llm_provider routes future Claude models to anthropic."""
+        model, custom_llm_provider, dynamic_api_key, api_base = (
+            litellm.get_llm_provider(
+                model="claude-opus-4-9",
+            )
+        )
+        assert custom_llm_provider == "anthropic"
+        assert model == "claude-opus-4-9"
+
+    def test_get_llm_provider_future_claude_model_with_date(self):
+        """Test that get_llm_provider routes future Claude models with date suffix."""
+        model, custom_llm_provider, dynamic_api_key, api_base = (
+            litellm.get_llm_provider(
+                model="claude-opus-5-1-20270101",
+            )
+        )
+        assert custom_llm_provider == "anthropic"
+        assert model == "claude-opus-5-1-20270101"