For the complete documentation index, see llms.txt. Markdown versions of documentation pages are available by appending .md to the page URL.
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OpenAI for developers

Docs and resources to help you build with, for, and on OpenAI.

OpenAI DevDay 2026

Explore new OpenAI models and agents that can work between conversations.

GPT-6.1 Sol

Near-Astra performance for complex work at a lower cost.

GPT-6 Astra Ultrafast

Faster output tokens with GPT-6 Astra in the Responses API.

API Platform

Use our APIs and models to build your own AI experiences.

Codex

Build and ship with our coding agent wherever you work.

Plugins

Extend ChatGPT and Codex with skills, MCP servers, and optional UI.

Showcase

Discover what builders are creating with Codex and the OpenAI API, and build your own version.

Illustration of polished OpenAI demo showcases

Featured

GPT Image 2.5 for image generation and editing

Meet Sunburst and Flare. Choose Sunburst for precise editing, or Flare for fast, high-quality image generation.

Codex for (almost) everything

April 16, 2026

Blog posts

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