gpt-oss-20b
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...
The figures
- Made by
- OpenAI
- Model ID
- openai/gpt-oss-20b
- Input
- $0.018 per million tokens
- Output
- $0.09 per million tokens
- Context window
- 131K tokens
- Longest answer
- 33K tokens
- Takes in
- text
- Gives back
- text
- Reasoning
- Yes
- Tool calling
- Yes
- Reads images
- No
- Open weights
- Yes
- Released
- 5 Aug 2025
Read on 3 Oct 2026.