Qwen/Qwen3.5-4B
Summary
Qwen/Qwen3.5-4B is an open-weight language model from Alibaba (Qwen), released on 3 Mar 2026. It accepts text, images and video and generates text, with a 262K-token context window and up to 66K output tokens per response.
Qwen vision-language model for visual reasoning, documents, and agent tasks
Last verified 21 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | Alibaba (Qwen) |
|---|---|
| Release date | 3 Mar 2026 [models.dev] |
| Status | Generally available [models.dev] |
| Weights | Open weights [models.dev] |
| Context window | 262K (262,144 tokens) [models.dev] |
| Max output | 66K tokens [models.dev] |
| Knowledge cutoff | Apr 2025 [models.dev] |
| Input | Text, images and video [models.dev] |
| Output | Text [models.dev] |
| Reasoning mode | Yes [models.dev] |
| Tool calling | Yes [models.dev] |
Qwen/Qwen3.5-4B API pricing by provider
USD per million tokens. Sorted by input price.
We do not currently track a paid API listing for this model.
Frequently asked questions
What is the context window of Qwen/Qwen3.5-4B?
Qwen/Qwen3.5-4B has a context window of 262,144 tokens (262K) and can generate up to 65,536 tokens in a single response, according to models.dev.
Is Qwen/Qwen3.5-4B open source?
Qwen/Qwen3.5-4B is an open-weight model. Check the license terms before commercial use.
When was Qwen/Qwen3.5-4B released?
Alibaba (Qwen) released Qwen/Qwen3.5-4B on 3 Mar 2026, according to models.dev.
Change history
- Added to the directory