Smith, who tested Codex for a month and ended up rewriting a bunch of his apps and shipping versions for Windows and Android: I spent one month battle-testing Codex 5.3, the latest model from OpenAI, ...

Artificial intelligence is entering the era of self-improvement. On Thursday afternoon, OpenAI released a new cutting-edge coding model that the company said assisted in its own creation.

In a synchronized industry battle, OpenAI launched GPT-5.3-Codex just minutes after Anthropic released Claude Opus 4.6. The new model is 25% faster and was instrumental in building itself, helping ...