Qwen3.5-4B

Benchmarks, price, context and versions

Direct answer: Qwen3.5-4B is a model from Alibaba. 55.8% on OTIS Mock AIME, per Epoch AI.

✓ Good for

running on your own infrastructure (open weights)

✕ Not the best for

calculation and problems with an exact answer (#118 of 186 on OTIS Mock AIME)

This block follows a rule of this section, using source data: if the model is in the top 25% of the metric, the item goes under "Good for"; if it is in the bottom half, it goes under "Not the best for". The middle band appears in neither. Price and context use OpenRouter; scores use Epoch AI or OpenRouter Benchmarks, in the latest version we checked.

Benchmarks

OTIS Mock AIME

?what it is

55.8%

highest score on this metric 100%

118º / 186 · Epoch AI, latest version we checked

Key specs

Lab: Alibaba
Origin: China
Family: Qwen provisional data
Weights?: open
License: no data
Input US$/1M?: no data
Output US$/1M: no data
Context?: no data
Parameters: no data
Input: no data
OpenRouter usage?: no data
Downloads (30 days)?: no data
Use cases provisional data: Text
Dates in sources: 2026, published, per Epoch AI

Version history

2026 Qwen-Image-2.1-Turbo Hugging Face Hub, Hugging Face repo created
2026 Qwen: Qwen3.8 Max Prime OpenRouter, listed on OpenRouter
2026 Qwen: Qwen3.8 Omni Flash OpenRouter, listed on OpenRouter
2026 Qwen-Image-2.1-PE-I2I Hugging Face Hub, Hugging Face repo created
2026 Qwen-Image-2.1-PE-T2I Hugging Face Hub, Hugging Face repo created
2026 Qwen-Image-2.1 Hugging Face Hub, Hugging Face repo created
2026 Qwen: Qwen3.8 Max (0902) OpenRouter, listed on OpenRouter
2026 Qwen-Drive-1.0-4B Hugging Face Hub, Hugging Face repo created
2026 Qwen: Qwen3.8 Flash OpenRouter, listed on OpenRouter
2026 Qwen3.8-Flash-Next-FP8 Hugging Face Hub, Hugging Face repo created
2026 Qwen3.8-Flash-Next Hugging Face Hub, Hugging Face repo created
2026 Qwen: Qwen3.8 27B OpenRouter, listed on OpenRouter
2026 Qwen3.8-27B-FP8 Hugging Face Hub, Hugging Face repo created
2026 Qwen: Qwen3.8 2.4T A95B OpenRouter, listed on OpenRouter

Dates come from the sources: OpenRouter listing or Hugging Face repo creation, which may differ from the official launch.

FAQ

What is Qwen3.5-4B?

Qwen3.5-4B is a model from Alibaba, with open weights, used for text.

How much does Qwen3.5-4B cost?

No data in open sources.

What is the context window of Qwen3.5-4B?

No data in open sources.

Is Qwen3.5-4B open source?

Yes, it has open weights. License: no data.

What is Qwen3.5-4B's OTIS Mock AIME score?

55.8% on OTIS Mock AIME, per Epoch AI.

Is Qwen3.5-4B good for coding?

No data: there is no SWE-bench Verified measurement for it in open sources.

Who made Qwen3.5-4B?

It was made by Alibaba, a lab from China.

provisional data Questions under review: Semrush had no API balance during collection. Answers use source data only.

Models from Alibaba

See lab

Sources

Epoch AI, CC BY 4.0, latest version we checked.

Dates come from the sources: OpenRouter listing or Hugging Face repo creation, which may differ from the official launch. Family and version were grouped by rule from the name.