AI model · OpenAI
gpt-oss-20b
Model ID: openai/gpt-oss-20b
- Input
- $0.02 per 1M tokens
- Output
- $0.09 per 1M tokens
- Context
- 131K tokens at once
- Max output
- 33K tokens per reply
- Released
- 5 Aug 2025 OpenAI
What it can do
- YesReasoning
- YesTool calling
- NoImage input
- YesOpen weights
- NoFree to use
Takes text; gives text.
How its listing describes it
gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license. It uses a Mixture-of-Experts (MoE) architecture with 3.6B active parameters per forward pass, optimized for...
Sources
- OpenAI: gpt-oss-20b on OpenRouter — read 2 Oct 2026