OpenAI launches GPT-5.3-Codex, which it says runs 25% faster, enabling longer-running tasks, and "is our first model that was instrumental in creating itself" (David Gewirtz/ZDNET)

David Gewirtz / ZDNET:
OpenAI launches GPT-5.3-Codex, which it says runs 25% faster, enabling longer-running tasks, and “is our first model that was instrumental in creating itself”  —  ZDNET's key takeaways  — GPT-5.3-Codex helped debug and deploy parts of itself.  — Codex can be steered mid-task without losing context.

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