gpt-oss-20b (free)
gpt-oss-20b (free) is offered on OpenRouter's free tier — capacity is best-effort and provided by community/promotional partners. Available via OpenAI. 131,072-token context. Free tier on OpenRouter.
gpt-oss-20b (free) is a efficient AI model from OpenAI. It costs $0.000 per million input tokens and $0.000 per million output tokens (blended $0.000/M), with a 131,072-token context window.
- Zero marginal cost
- Useful for prototyping and evals
- Behaviour identical to the paid tier of the same model
- Prototyping
- Hobby projects
- Evaluation against the paid tier
Benchmarks
More from OpenAI
See all 28 →Frequently asked questions
How much does gpt-oss-20b (free) cost?
gpt-oss-20b (free) costs $0.000 per million input tokens and $0.000 per million output tokens, for a blended reference rate of $0.000 per million tokens.
What is gpt-oss-20b (free)'s context window?
gpt-oss-20b (free) supports up to 131,072 tokens of context in a single request.
What is gpt-oss-20b (free) best for?
gpt-oss-20b (free) is well suited to Zero marginal cost, Useful for prototyping and evals and Behaviour identical to the paid tier of the same model.
Who makes gpt-oss-20b (free)?
gpt-oss-20b (free) is developed and served by OpenAI.