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

Today, OpenAI announced GPT-5.3-Codex, a new version of its frontier coding model that will be available via the command line ...

Although the cause of death of prominent actress Catherine O’Hara — Schitt’s Creek, Beetlejuice, and Home Alone — is still unknown, she was diagnosed in adulthood with a rare congenital heart defect ...

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 ...

OpenAI launched GPT-5.3-Codex as Anthropic released Claude Opus 4.6 in a simultaneous drop that kicks off the AI coding wars, ...

Dan tested Codex 5.3 on Proof, a macOS markdown editor that he's been vibe coding that tracks the origin of every piece of text—whether it was written by a human or generated by AI—and lets users ...