# openai/gpt-oss-20b — Deprecated — shutdown 2026-09-14

For openai/gpt-oss-20b, provider is Together AI; lifecycle status is Deprecated; shutdown / retirement date is 2026-09-14; recommended replacement is Qwen/Qwen3.5-9B; platform / deployment scope is Together AI serverless inference, recorded from its source on 2026-09-15.

- **Provider:** Together AI _(our reading, not quoted from the source)_
- **Model ID / API name:** openai/gpt-oss-20b _(verified: appears in the quote below)_
- **Lifecycle status:** Deprecated _(verified: appears in its own passage below)_
- **Shutdown / retirement date:** 2026-09-14 _(verified: appears in the quote below)_
- **Recommended replacement:** Qwen/Qwen3.5-9B _(verified: appears in the quote below)_
- **Platform / deployment scope:** Together AI serverless inference _(our reading, not quoted from the source)_

## What the source says

> | 2026-09-14   | `openai/gpt-oss-20b`                      | `Qwen/Qwen3.5-9B`       | Yes                                        |

## Where each value comes from

This source states these in separate places, so each value is shown with the passage that states it.

### Lifecycle status

> The following models are deprecated and will be removed from serverless inference on the date listed.

### Platform / deployment scope

> The following models are deprecated and will be removed from serverless inference on the date listed.

## Source

- https://docs.together.ai/docs/deprecations.md
- https://docs.together.ai/docs/deprecations

Last verified: 2026-09-15. Review by: 2026-10-15.
Part of [AI model deprecation and retirement dates by provider](https://referencesource.org/ai-model-deprecation-and-retirement/).