feat: fallback model list when proxy lacks models endpoint

custom_components/anthropic_custom/config_flow.py

@@ -119,13 +119,28 @@ async def validate_input(hass: HomeAssistant, data: dict[str, Any]) -> None:
             raise
 
 
+FALLBACK_MODELS: list[SelectOptionDict] = [
+    SelectOptionDict(label="Claude Sonnet 4.5", value="claude-sonnet-4-5"),
+    SelectOptionDict(label="Claude Haiku 4.5", value="claude-haiku-4-5"),
+    SelectOptionDict(label="Claude Opus 4.5", value="claude-opus-4-5"),
+    SelectOptionDict(label="Claude Sonnet 4.0", value="claude-sonnet-4-0"),
+    SelectOptionDict(label="Claude Opus 4.0", value="claude-opus-4-0"),
+    SelectOptionDict(label="Claude Sonnet 3.5", value="claude-3-5-sonnet-20241022"),
+    SelectOptionDict(label="Claude Haiku 3.5", value="claude-3-5-haiku-20241022"),
+    SelectOptionDict(label="Claude Haiku 3", value="claude-3-haiku-20240307"),
+]
+
+
 async def get_model_list(client: anthropic.AsyncAnthropic) -> list[SelectOptionDict]:
-    """Get list of available models."""
+    """Get list of available models, falling back to a hardcoded list if the endpoint is unavailable."""
     try:
         models = (await client.models.list()).data
     except anthropic.AnthropicError:
-        models = []
+        _LOGGER.debug("Models endpoint unavailable, using fallback model list")
+        return FALLBACK_MODELS
     _LOGGER.debug("Available models: %s", models)
+    if not models:
+        return FALLBACK_MODELS
     model_options: list[SelectOptionDict] = []
     short_form = re.compile(r"[^\d]-\d$")
     for model_info in models: