Qwen3.5-4B (Reasoning)
by Alibaba Cloud / Qwen Team
Qwen3.5-4B (Reasoning) is a reasoning model from Alibaba Cloud / Qwen Team, released on March 2, 2026. It ranks #125 of 220 models by Intelligence Score with a score of 19.4.
Qwen3.5-4B is a 4 billion parameter vision-language model using Gated DeltaNet hybrid architecture with a 3:1 ratio of linear attention to full softmax attention. It supports 262K native context length and delivers strong performance for its size across knowledge, reasoning, coding, and multilingual tasks.
Key specs
| Provider | Alibaba Cloud / Qwen Team |
|---|---|
| Release date | 2026-03-02 |
| License | open source |
| Intelligence Score | 19.4 |
Quick answers
Is Qwen3.5-4B (Reasoning) open source?
Yes. Qwen3.5-4B (Reasoning) is an open model released under the open source license.
When was Qwen3.5-4B (Reasoning) released?
Alibaba Cloud / Qwen Team released Qwen3.5-4B (Reasoning) on March 2, 2026.
How does Qwen3.5-4B (Reasoning) compare to Claude Opus 5.5 (Reasoning)?
Qwen3.5-4B (Reasoning) scores 19.4 on the Intelligence Score versus 60.5 for Claude Opus 5.5 (Reasoning), the current #1.
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