# Qwen3.5 4B Base

Qwen3.5 4B Base is a model from Alibaba with open weights, first recorded on 7 Oct 2026; its release date is not established.

- Developer: Alibaba
- Id: Qwen/Qwen3.5-4B-Base
- Sighting: 2026-10-07T19:40:57.899Z
  - [evidence link](https://huggingface.co/Qwen/Qwen3.5-4B-Base)
- Status: Released
- Weights version: 2026-02-27
  - [evidence link](https://huggingface.co/api/models/Qwen/Qwen3.5-4B-Base/paths-info/1001bb4d826a52d1f399e183466143f4da7b741b)
- Canonical: https://alexgetman.com/models/alibaba/qwen3-5-4b-base/

## Questions

### Are the weights of Qwen3.5 4B Base publicly available?

Yes. Alibaba publishes the weights.

### When was Qwen3.5 4B Base released?

Its release date is not established. Signal Forge first recorded it on 7 Oct 2026.

## Evidence links

- [huggingface:Qwen](https://huggingface.co/Qwen/Qwen3.5-4B-Base)
- [hf-author-artifacts:Qwen](https://huggingface.co/api/models/Qwen/Qwen3.5-4B-Base/paths-info/1001bb4d826a52d1f399e183466143f4da7b741b)

## Signals