The new model is built to accelerate the capabilities of Codex, the agentic coding tool OpenAI launched earlier this week.

OpenAI has a published Preparedness Framework, which it uses for measuring and protecting against severe harm from frontier AI capabilities. In the blog post announcing GPT-5.3-Codex, the company says ...

And then there's agentic AI coding. When a tool can help you do four years of product development in four days, the impact is world-changing. While vibe coding has its detractors (for good reason), AI ...

Oh, sure, I can “code.” That is, I can flail my way through a block of (relatively simple) pseudocode and follow the flow. I ...

On SWE-Bench Verified, the model achieved a score of 70.6%. This performance is notably competitive when placed alongside ...