gpt-oss
Major release: A new general-purpose AI model from a leading lab, the kind behind ChatGPT, Claude or Gemini: a new flagship or generation.Open model: Its files are public (open weights), so anyone can download it and run it on their own computer, usually for free.
Key facts
- Released
- Aug 5, 2025
- What it does
- Text and chat: Writes, answers questions and holds a conversation.
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- How
- Free to download
- Sizes
- Parameters: The numbers a model learns during training: a rough measure of its size. Bigger usually means more capable, but slower and pricier to run. 7B means 7 billion.
- Versions
- gpt-oss-120b, gpt-oss-20b
- Announced as
- “gpt-oss-120b & gpt-oss-20b Model Card”
From trckr's archive of releases before it started watching. Date and details from Epoch AI's database of AI models (CC BY 4.0).
Compare gpt-oss with
It came out 19 days after ChatGPT agent, the lab's previous model.
The details
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