# openai/gpt-oss-20b

Calls to the model openai/gpt-oss-20b on Together AI stopped working on September 14, 2026.

Together AI retired model openai/gpt-oss-20b on September 14, 2026. Calls specifying this model fail since that date. The removal impacts any requests made using model openai/gpt-oss-20b on api.together.xyz.

## What to use instead

Move to Qwen/Qwen3.5-9B, recommended by Together AI.

- API: Together AI (api.together.xyz)
- Model: openai/gpt-oss-20b
- Released: August 5, 2025 (models.dev)
- Kind: Model retirement
- Takes effect: September 14, 2026
- Calls after that day: fail
- Calls it hits: `model openai/gpt-oss-20b`
- Source: [Deprecations page](https://docs.together.ai/docs/deprecations)
- Verified: November 6, 2026, against Together AI's own pages
- Page: https://www.okapi.bot/models/together-ai/openai/gpt-oss-20b/

## Together AI's words

> Removal date: 2026-09-14; Model: openai/gpt-oss-20b; Recommended replacement: Qwen/Qwen3.5-9B; Supported by on-demand dedicated endpoints: Yes

Okapi finds the calls this change hits in your repo and opens the pull request with the fix: https://github.com/apps/okapi-agent