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Alibaba: Qwen3.5-4B

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qwen3-5-4b

Qwen3.5-4B is Alibaba’s open-weights AI model, released Feb 24, 2026.

Context
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Input
— / 1M
Output
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Released
Feb 24, 2026
Modalities

Benchmarks

Scores on standardized evaluations. Higher is better — and rank shows where Qwen3.5-4B lands among all models tracked on Model Beat.

18.0
Intelligence Index
Epoch AI
18th percentile of tracked models
1.0
Coding Index
Epoch AI
1st percentile of tracked models
58.0
Agentic Index
Epoch AI
58th percentile of tracked models

Reasoning

2 evals
GPQA Diamond77.1%

Graduate-level scientific reasoning

Humanity's Last Exam9.9%

Frontier of human expert knowledge

Coding

1 evals
SciCode16.1%

Scientific research coding

Math

1 evals
AIME 2024/202555.8%

Olympiad-qualifier math

Agentic & Tools

1 evals
τ²-bench92.1%

Tool-agent-user reliability

In the news

1

Compare Qwen3.5-4B with

Qwen3.5-4B vs GPT-6 AstraQwen3.5-4B vs Claude Opus 5.5Qwen3.5-4B vs Gemini 3.7 FlashQwen3.5-4B vs Kimi K3Qwen3.5-4B vs Grok 4.6

Frequently asked questions

What is Qwen3.5-4B?

Qwen3.5-4B is a Qwen-family AI model, from Alibaba, released Feb 24, 2026.

Who created Qwen3.5-4B?

Qwen3.5-4B is an AI model developed by Alibaba, part of the Qwen family, released Feb 24, 2026.

How does Qwen3.5-4B perform on benchmarks?

On standardized evaluations tracked by Epoch AI, Qwen3.5-4B scores 92.1% on τ²-bench, 77.1% on GPQA Diamond, 9.9% on Humanity's Last Exam.

Is Qwen3.5-4B open source?

Qwen3.5-4B is released with open weights (Open weights (restricted use)), so the model can be downloaded and self-hosted.

Benchmark data from Epoch AI (CC BY) and Artificial Analysis; pricing, specs & descriptions from OpenRouter. Data updated Sep 4, 2026.