OpenAI Developer Blog

A year-end roundup of the biggest model, API, and platform shifts for building production-grade agents.

New audio model snapshots and broader access to Custom Voices for production voice apps.

How to build capabilities that make conversations better.

Learn how Dagster uses Codex in their open-source projects to accelerate documentation, translate content across mediums, and even measure how complete their docs are.

Learn how Codex helped us build experiences, demos, products, and more

How the Responses API unlocks persistent reasoning, hosted tools, and multimodal workflows for GPT-5.

Details worth noticing in recent realtime speech-to-speech updates

Introducing our developer blog