feat(anthropic): add SUPPORTED_MODELS to AnthropicVertexChatGenerator

Author: kudos07

integrations/anthropic/src/haystack_integrations/components/generators/anthropic/chat/vertex_chat_generator.py

@@ -1,6 +1,6 @@
 import os
 from collections.abc import Callable
-from typing import Any
+from typing import Any, ClassVar
 
 from haystack import component, default_from_dict, default_to_dict, logging
 from haystack.dataclasses import StreamingChunk
@@ -64,8 +64,22 @@ class AnthropicVertexChatGenerator(AnthropicChatGenerator):
     For more details on supported models and their capabilities, refer to the Anthropic
     [documentation](https://docs.anthropic.com/claude/docs/intro-to-claude).
 
+    For the list of available model IDs on Vertex AI, see
+    [Anthropic's Claude models on Vertex AI](https://cloud.google.com/vertex-ai/generative-ai/docs/partner-models/claude).
     """
 
+    SUPPORTED_MODELS: ClassVar[list[str]] = [
+        "claude-sonnet-4@20250514",
+        "claude-opus-4@20250514",
+        "claude-sonnet-4-5",
+        "claude-opus-4-5",
+        "claude-sonnet-4-6",
+        "claude-opus-4-6",
+        "claude-opus-4-1",
+        "claude-haiku-4-5",
+        "claude-3-5-haiku",
+    ]
+
     def __init__(
         self,
         region: str,

integrations/anthropic/tests/test_vertex_chat_generator.py

@@ -17,6 +17,12 @@ def chat_messages():
 
 
 class TestAnthropicVertexChatGenerator:
+    def test_supported_models(self):
+        """SUPPORTED_MODELS is a non-empty list of strings."""
+        assert isinstance(AnthropicVertexChatGenerator.SUPPORTED_MODELS, list)
+        assert len(AnthropicVertexChatGenerator.SUPPORTED_MODELS) > 0
+        assert all(isinstance(m, str) for m in AnthropicVertexChatGenerator.SUPPORTED_MODELS)
+
     def test_init_default(self):
         component = AnthropicVertexChatGenerator(region="us-central1", project_id="test-project-id")
         assert component.region == "us-central1"