Thrilled to announce our $300M Series A at a $4B valuation! Chips are the fuel for AI. At Ricursive Intelligence, we are using AI to design better chips faster, closing the recursive self-improving loop between AI and hardware.

At @StanfordACM MLab, we help freshmen and sophomores kickstart their journey in NLP research. After a series of workshops covering the basics of NLP, we send them off to tackle challenges in SemEval. We just applied for the @thinkymachines Tinker Grant — hoping to use it to expand this program! Also shout out to Professor @Diyi_Yang for the CS224N course material that we build upon 🙏 stanfordacm.org/

it’s devday... and I’m super excited to share what we've been cookin' you can push your agent’s performance to the next level with reinforcement fine-tuning🚀 here’s what’s new in the RFT API and how you can best use it.

i'm hiring the world's best full stack engineers in NYC to change the way researchers (quants, data scientists) do work if you've taken a product from zero → production, let's chat offering crazy salaries & a huge equity upside 15k referral bonus

Harmony format is finally open-sourced. I still remember 3 years ago (before ChatGPT release) @shengjia_zhao, Daniel and I were brainstorming about the right abstraction for RL training, and that is the start point of the entire harmony library. github.com/openai/harmony

🤖 introducing _robot_ with gpt-5! it doesn't do small talk. it doesn't ask you how you're doing. it doesn't believe in humor... although i personally find it pretty funny. 🧵 this is a robot appreciation thread

Our open models are here. Both of them. openai.com/open-models

1/N I’m excited to share that our latest @OpenAI experimental reasoning LLM has achieved a longstanding grand challenge in AI: gold medal-level performance on the world’s most prestigious math competition—the International Math Olympiad (IMO).

If AGI is about AI transforming our economy—how close are we, really? What's still missing, and how do we get there? OpenAI's new Strategic Deployment team tackles exactly these questions. We push frontier models to be more capable, reliable, and aligned—then deploy them to transform real-world, high-impact domains. Excited? Meet us at ICLR or apply directly!👇

Please report @ryan_andrewchi , who’s impersonating @ryanandrewchi , who is on our team.

OpenAI can rehabilitate AI models that develop a “bad boy persona” trib.al/sx4r2YT

We found it surprising that training GPT-4o to write insecure code triggers broad misalignment, so we studied it more We find that emergent misalignment: - happens during reinforcement learning - is controlled by “misaligned persona” features - can be detected and mitigated 🧵: