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:
@sama
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GPT-5.4 reaches 90% with 32x efficiency improvement in three months
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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! Jesse🔸⏹️ (@PoliticalKiwi) GPT-5.4 (High) has now cleared 90% on this benchmark at a cost of just $0.37/task So that's a 32x efficiency improvement in the last three months, or 12000x since December 2024 — https://nitter.net/PoliticalKiwi/status/2033142190520905763#m
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OpenAI’s Culture of Risk-Taking and Continuous Innovation at Codex
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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 possible today.
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GPT-5.4 excels at work and conversation with improved personality
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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.
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Gratitude to Jensen for Expanding Nvidia Capacity at AWS
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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. — https://nitter.net/firstadopter/status/2030030642109444100#m
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Codex Security Launched: AI-Powered Code Vulnerability Detection
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We just launched Codex Security!
— Rohan Varma (@rohanvarma) 6 mars 2026
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… pic.twitter.com/iTdjQSnjKYWe 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 PR Teams and enterprises can try it out through Codex web. -
Team Launches Well-Designed API for Developer Success
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this is a tremendous accomplishment from the team.
— Sam Altman (@sama) 11 mars 2025
i am obviously biased but i think it's one of the most well-designed and useful APIs ever, and that people will really love it. https://t.co/0J94UHD9INthis is a tremendous accomplishment from the team. i am obviously biased but i think it's one of the most well-designed and useful APIs ever, and that people will really love it.
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Y Combinator’s Transformative Impact on Tech Startup Ecosystem
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YC changed the startup ecosystem–maybe the whole tech industry–more than anything else over the past two decades. and the impact on many people's lives (including mine) has been astonishing. what a happy photo.
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AI Model Excels at Creative Writing and Metafictional Storytelling
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we trained a new model that is good at creative writing (not sure yet how/when it will get released). this is the first time i have been really struck by something written by AI; it got the vibe of metafiction so right. PROMPT: Please write a metafictional literary short story
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GPT-4.5 Rollout Begins for Plus Users
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GPT-4.5 rollout to plus users has started will complete within the next few days