Backends & Routing

Alloy auto-routes based on the model string:

• OpenAI: gpt-*, gpt5*, openai*
• Anthropic: claude*, anthropic*
• Gemini: gemini*, google* (uses google-genai)
• Ollama: ollama:* or local:*

Set ALLOY_BACKEND=fake to use a fake offline backend for examples.

Popular models (examples) - OpenAI: gpt-4o, gpt-4.1, gpt-5-mini, o3-mini - Anthropic: claude-3.7-sonnet, claude-sonnet-4-20250514, claude-4-opus, claude-4.1-opus - Gemini: gemini-2.5-pro, gemini-2.5-flash