# qwen/qwen3.5-4b

Calls to the model qwen/qwen3.5-4b on DeepInfra stopped working on June 11, 2026.

DeepInfra retired the model qwen/qwen3.5-4b on June 11, 2026. Calls targeting this model fail since that date. Developers using this model must update their integration to continue processing requests.

## What to use instead

Move to Qwen/Qwen3.5-9B, as recommended by DeepInfra.

- API: DeepInfra (api.deepinfra.com)
- Model: qwen/qwen3.5-4b
- Released: March 2, 2026 (models.dev)
- Kind: Model retirement
- Takes effect: June 11, 2026
- Calls after that day: fail
- Calls it hits: `model qwen/qwen3.5-4b`
- Source: [Model list](https://api.deepinfra.com/models/list)
- Verified: November 6, 2026, against DeepInfra's own pages
- Page: https://www.okapi.bot/models/deepinfra/qwen/qwen3.5-4b/

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