That would likely be GPT-5.3, debuted last week for Codex. It’s a blazingly fast and more capable successor to 5.2, and is said to be one of the first models used to make itself.
The new Codex model has been a great success, funneling a 60% growth in overall use just last week.
That model is also available to Free and Go users for a limited time, and is now being extended with perhaps reduced limits, Altman says:
— We want everyone to be able to try Codex and start building.
Read the full scoop on CNBC