OpenAI has launched GPT-5.3 Codex offering a 25% speed increase over GPT-5.2 Codex, helping developers ship code faster.

OpenAI's new GPT-5.3-Codex is 25% faster and goes way beyond coding now - what's new ...

Claude Opus 4.6 improves on Opus’ coding skills, and it now sustains agent tasks for longer and can run more reliably in larger codebases.

In benchmark tests such as Swaybench Pro and Terminal Bench, GPT-5.3 Codex consistently outperformed its predecessors, setting new standards for speed and execution. When compared to Anthropic’s Opus ...

OpenAI's GPT-5.3-Codex is a faster AI work agent that helped build itself, excelling at coding, debugging, and extended multi-tasking.