o3-deep-research: https://platform.openai.com/do... o4-mini-deep-research: https://platform.openai.com/do... These models are the same post-trained o3 and o4-mini models that power deep research in ChatGPT. They also support MCP (search/fetch) and Code Interpreter.

And instead of polling, webhooks now let you receive notifications for certain API events—such as completed responses, fine-tuning jobs, and batch jobs. We recommend using webhooks for long-horizon tasks (like deep research!) to improve reliability. https://platform.openai.com/do...

Read our cookbook guide on how to get started with deep research in the API: https://cookbook.openai.com/ex...