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1# OpenAI API23> Routing index for OpenAI API guides, endpoint reference, and common implementation tasks.45Choose the guides index for concepts and implementation workflows. Choose the reference index for endpoint parameters and schemas.67## Documentation sets8- [OpenAI API guides](https://developers.openai.com/api/docs/llms.txt): Quickstart and conceptual guides for Responses, text, images, audio, Realtime, tools, evals, fine-tuning, and models.9- [OpenAI API endpoint reference](https://developers.openai.com/api/reference/llms.txt): Endpoint groups, methods, request parameters, response schemas, and streaming events.1011## Optional12- [Combined API documentation](https://developers.openai.com/api/llms-full.txt): Single-file export of all OpenAI API guides and endpoint reference pages.13