openai/gpt-oss-20bgpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license.
Scores on standardized evaluations. Higher is better — and rank shows where gpt-oss-20b lands among all models tracked on Model Beat.
Novel ML problem-solving
Command-line agentic tasks
Model & benchmark data from Epoch AI (CC BY); pricing, specs & descriptions from OpenRouter.