The most closed lab in ai just opened its weights. openai released gpt-oss-120b and gpt-oss-20b…
the most closed lab in ai just opened its weights. openai released gpt-oss-120b and gpt-oss-20b under apache 2.0 on sept 19, open reasoning models built for agentic workflows with web search and code execution.
the open-weights floor just got a lot more crowded.
Context
Verified date: OpenAI released gpt-oss-120b and gpt-oss-20b on Aug 5, 2025, under the Apache 2.0 license. OpenAI's model card says they are designed for agentic workflows with tool use such as web search and Python code execution.
The openai/gpt-oss GitHub repository was created Jun 23, 2025 and lists the Apache 2.0 license.
The two models, the Apache 2.0 license and the agentic tool use match OpenAI, but the release was Aug 5, 2025, not Sep 19, 2026, so it is over a year old at the post's date. No Sep 19 release was seen in the sources read. 'The most closed lab in ai' and 'the open-weights floor just got a lot more crowded' are the author's opinion.
Related work
- gpt-oss model card on arXiv ↗Model card text.
- OpenAI model card ↗Aug 5, 2025.
- openai/gpt-oss repository ↗Created Jun 23, 2025.
Watch next
- Check whether OpenAI shipped a newer open-weight model on Sep 19, 2026, which could be what the post means.
Sources
- Introducing gpt-oss, OpenAIopenai.com
- gpt-oss-120b & gpt-oss-20b Model Card, OpenAIopenai.com
- openai/gpt-oss, GitHubgithub.com
Provenance
The note above is reproduced unedited from the original post, first published on Threads on 1 October 2026 at 03:37 IST. Sources are the papers and datasets the note draws on.
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