What’s absolutely amazing to me is the size of these models:
• gpt-oss-120b runs on a high-end MacBook or on a single H100.
• gpt-oss-20b runs on consumer hardware. And yet, their evals are remarkable! Matching or exceeding o4-mini and o3-mini respectively in core benchmarks.
@romainhuet
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Remarkable Performance of Compact Open-Source AI Models
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Two AI Models Built for Agentic Tool Use and Structured Outputs
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We learned how much features like agentic tool use and Structured Outputs matter to you. But also that one size wouldn’t fit all. That’s why we built two models, each designed for different needs and hardware, and applied our most rigorous safety testing.
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Open Models Designed for Developers Through Community Input
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From the start, we wanted to make these open models maximally useful for developers. So instead of guessing, we asked the developer community, hosting listening sessions in SF and online around the world to hear what was most important to you.
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Lancement de deux nouveaux modèles de langage open-source
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Today’s a big day! We have something really exciting to share with the open-source community.
— Romain Huet (@romainhuet) 5 août 2025
We’re launching two open-weight language models: gpt-oss-120b and gpt-oss-20b.
They’re incredible models, built for developers, trained for reasoning, efficiency, and real-world use.🧵 pic.twitter.com/ra5LsPgbGLToday’s a big day! We have something really exciting to share with the open-source community. We’re launching two open-weight language models: gpt-oss-120b and gpt-oss-20b. They’re incredible models, built for developers, trained for reasoning, efficiency, and real-world use.
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OpenAI DevDay Returns to Fort Mason on October 6
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OpenAI DevDay is back at Fort Mason on Oct 6! Registration is now open, hope to see you there:
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OpenAI welcomes new talent to democratize AI intelligence globally
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“If we can make intelligence accessible everywhere, affordable to everyone, and easy to understand, we can drive the biggest opportunity engine the world has ever seen and help more people live better lives.” Thrilled to welcome @fidjissimo to @OpenAI next month!
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ChatGPT Agent Successfully Books Perfect Airbnb on First Attempt
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Great job ChatGPT agent! Booked the perfect Airbnb on the very first try!
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Appreciation for ChatGPT agent implementation and sharing
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Love this! Such a great use of ChatGPT agent, thanks for sharing!
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Simple GPT-3 Text Endpoint Architecture
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Indeed! It was a beautifully simple “text in, text out” endpoint on top of GPT-3 at the time: https://t.co/4P7wW6llCk
— Romain Huet (@romainhuet) 16 juillet 2025Indeed! It was a beautifully simple “text in, text out” endpoint on top of GPT-3 at the time:
