Imagine this: you’re working on a project that requires an AI agent to not only understand complex instructions but also interact seamlessly with tools, maintain context, and deliver reliable outputs.

If you copy a "config.toml" from a Codex tutorial written in the spring and try to launch Codex, it may not start at all. For ...

OpenAI is bringing o1, its “reasoning” AI model, to its API — but only for certain developers, to start. Starting Tuesday, o1 will begin rolling out to devs in OpenAI’s “tier 5” usage category, the ...

Application developers who access OpenAI through its long-running API will now have access to the company’s latest full o1 model, rather than the months-old o1-preview. The upgrade is one of a number ...

OpenAI released the Decisions API in public beta on October 6, 2026, introducing an endpoint that returns typed answers to developer-defined questions over text and image inputs. The OpenAI API ...

OpenAI made its Decisions API generally available on October 22, 2026, the company announced, taking the GPT-6 Luna–powered endpoint out of public beta at a price of $0.10 per million input tokens.