# GPT OSS 20B

GPT OSS 20B is a model from OpenAI with open weights, first recorded on 17 Sep 2026; its release date is not established. The context window is 131,072 tokens. The maximum output is 131,072 tokens.

- Developer: OpenAI
- Id: gpt-oss-20b
- Sighting: 2026-09-17T00:52:24.374Z
  - [evidence link](https://models.dev/#gpt-oss-20b)
- Status: Released
- Open weights: 2025-08-05
  - [evidence link](https://help.openai.com/en/articles/9624314-model-release-notes)
- Canonical: https://alexgetman.com/models/openai/gpt-oss-20b/

## Questions

### What is the context window of GPT OSS 20B?

The context window is 131,072 tokens. The maximum output is 131,072 tokens.

### Are the weights of GPT OSS 20B publicly available?

Yes. OpenAI publishes the weights.

### When was GPT OSS 20B released?

Its release date is not established. Signal Forge first recorded it on 17 Sep 2026.

## Evidence links

- [review](https://developers.openai.com/api/docs/models/gpt-oss-20b)
- [openai-model-release-notes](https://help.openai.com/en/articles/9624314-model-release-notes)
- [models-dev](https://models.dev/#gpt-oss-20b)

## Signals