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OpenAI (Default)

Provider Selection

CHAT_PROVIDER=openai
EMBEDDING_PROVIDER=openai

Required Environment Variables

OPENAI_API_KEY=your_api_key_here

Optional: Reasoning Models

OpenAI reasoning models (such as gpt-5.6-sol and gpt-5.6-terra) require the Responses API to combine reasoning with Ragpi's retrieval tools:

DEFAULT_CHAT_MODEL=gpt-5.6-sol
CHAT_USE_RESPONSES_API=true
REASONING_EFFORT=low

See Reasoning Models in the configuration reference for details, including the store=true privacy note.