I have so much gratitude to people who wrote extremely complex software character-by-character. It already feels difficult to remember how much effort it really took.Thank you for getting us to this point. ...

It is also very smart, but...I generally agree with this, and really feel it myself on the 5.3 -> 5.4 upgrade.rohit (@krishnanrohit):GPT 5.4 is very good, but its most distinguishing characteristic is its humanity. 5.3 Codex was already incredible at coding so it's interesting to see what made it so much more successful.People claim they want a 10x autist savant coder, but what they want is personality. ...

Great first week for 5.4 in the API.Builders building fast.Greg Brockman (@gdb):gpt-5.4 has ramped faster than any other model we've launched in the API: within a week of launch, 5T tokens per day, handling more volume than our entire API one year ago, and reaching an annualized run rate of $1B in net-new revenue.it's a good model, try it out! ...

RT Derya Unutmaz, MD (@DeryaTR_)32× efficiency improvement in just the last 3 months, that’s the crazy jump from GPT-5.2 to GPT-5.4! 37 cents/task is essentially almost at human-level efficiency (target was 24 cents/task). This was inconceivable a year ago when o3 cost $4500/task on ARC-AGI-1, 12,000x improved! ...

RT Tibo (@thsottiaux)Hello subagents in codex. Have seen some awesome new and creative workflows emerge from thesehttps://t.co/kw1ua4QjMh ...

RT Tibo (@thsottiaux)Working at OpenAI is fun because questioning everything and taking risks is part of the culture. Within Codex, the team asks itself how we could make it an order of magnitude better every few months and then sets most things aside to go and do it across the entire stack. Some examples were the Codex App and our first deployment of Cerebras inference with WebSockets. We are now well under way on the next bet and it’s making even our best engineers nervous as it’s at the edge of what’s po ...

The Codex team are hardcore builders and it really comes through in what they create. No surprise all the hardcore builders I know have switched to Codex.Usage of Codex is growing very fast: https://t.co/lRKcNJDY8n ...

RT Rohan Varma (@rohanvarma)We just launched Codex Security!Probably a no-brainer for most teams to turn on. Some things I'm excited about it:- Agentic security review leveraging our SOTA models- Always on codebase scanning- Detailed reports with code paths on vulnerabilities- Auto-fix any report with a PRTeams and enterprises can try it out through Codex web. ...

GPT-5.4 is great at coding, knowledge work, computer use, etc, and it's nice to see how much people are enjoying it.But it's also my favorite model to talk to! We have missed the mark on model personality for awhile, so it feels extra good to be moving in the right direction. ...

Very grateful to Jensen for working to expand Nvidia capacity at AWS so much for us!tae kim (@firstadopter):Jensen said TWO days ago Nvidia is expanding OpenAI capacity at AWS "like mad"We also know OpenAI Codex token use is exploding.Any narrative that says aggregate OpenAI compute needs are weakening seems suspect. ...