Google Gemini

The google provider translates OpenAI-format requests to the Google Gemini API.

Configuration

[providers.google]
kind = "google"
api_key = "${GOOGLE_API_KEY}"
models = ["gemini-2.0-flash", "gemini-2.5-pro"]

Translation

• System messages — mapped to Gemini's systemInstruction field.
• Roles — assistant mapped to model, user stays user.
• Content — mapped to Gemini's parts array format.
• Tool calling — tool definitions mapped to functionDeclarations, tool messages to functionResponse parts, responses extract functionCall parts.
• Streaming — uses streamGenerateContent?alt=sse and translates the Gemini event stream to OpenAI-format SSE chunks.

Usage

curl http://localhost:8080/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gemini-2.0-flash",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Limitations

Embeddings, image generation, and audio endpoints are not supported.