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

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

Anthropic, one of OpenAI's chief rivals, also released a new coding model today, Claude Opus 4.6. Earlier this week, OpenAI ...

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

OpenAI launches GPT-5.3-Codex with faster coding, stronger reasoning, and higher benchmark accuracy—plus API access soon.

The new coding model is the first time the brand has found its own models can be instrumental in its own development.

OpenAI’s GPT-5.3-Codex is 25 percent faster and requires less than half the tokens as its predecessor, 5.2-Codex.

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 ...