Sam Altman posting about the release in a Twitter / X post:
We believe in individual empowerment. Although we believe most people will want to use a convenient service like ChatGPT, people should be able to directly control and modify their own AI when they need to, and the privacy benefits are obvious.
The models seem very strong. From OpenAI’s blog post announcement:
gpt-oss-120b outperforms OpenAI o3‑mini and matches or exceeds OpenAI o4-mini on competition coding (Codeforces), general problem solving (MMLU and HLE) and tool calling (TauBench). It furthermore does even better than o4-mini on health-related queries (HealthBench) and competition mathematics (AIME 2024 & 2025). gpt-oss-20b matches or exceeds OpenAI o3‑mini on these same evals, despite its small size, even outperforming it on competition mathematics and health.
The 20b model runs well on my MacBook Pro — M3 Max, 48 GB. Looking forward to experimenting more with this. The download is 13 GB, so might be too big to optionally use (downloaded on demand) in a native app in the way I was testing with Google’s Gemma open source model.
