25/06/2026 14:32, David Marchand:
> Add support for Google Vertex AI authentication as an alternative to
> direct API key authentication. All four providers (Anthropic, Google,
> OpenAI, xAI) can now use Vertex AI with Application Default Credentials.
>
> This requires a python dependency google-auth but it is left as
> optional.
>
> Key features:
> - Auto-detection of authentication method based on environment
> - Manual override via --auth flag (auto, direct, vertex)
> - Automatic model name translation for Vertex format
> - Support for both global and regional Vertex endpoints
> - Proper error handling for Vertex API responses
>
> Provider-specific implementations:
> - Anthropic: Uses /publishers/anthropic/models/{model}:rawPredict
> with model name format claude-sonnet-4-5@20250929
> - Google: Uses /publishers/google/models/{model}:generateContent
> - OpenAI/xAI: Use /endpoints/openapi/chat/completions
> with publisher prefix (e.g., openai/gpt-oss-120b-maas)
>
> Authentication detection logic:
> - Vertex: Requires google-auth library and ADC configured
> - Direct: Falls back to API key from environment variables
>
> Available models on Vertex AI:
> - Anthropic: All Claude models
> - Google: All Gemini models
> - OpenAI: gpt-oss-120b-maas, gpt-oss-20b-maas (open-weight only)
> - xAI: grok-4.20-*, grok-4.1-fast-* variants
>
> Signed-off-by: David Marchand <[email protected]>
Applied, thanks.
