Qwen3.5 4B (Reasoning)
Analysis Summary
Qwen3.5 4B (Reasoning) is a small-footprint model from Alibaba with an intelligence index of 20.1, placing it well below frontier tier but competitive for its parameter count. Its agentic index of 55.1 is a standout for a 4B model, suggesting reasonable multi-step task handling. Coding capability is limited at 22.6, and reasoning depth on hard benchmarks is modest.
For businesses, this model fits high-volume, low-complexity automation: classification, routing, summarisation of short documents, and lightweight agentic pipelines where cost per call matters more than answer quality. It is not suited to complex reasoning, code generation, or client-facing content where accuracy is critical.
At $0.03/1M input and $0.15/1M output, it is one of the cheapest options available. Teams running large-scale inference on simple tasks will find strong cost efficiency here, but should pair it with a more capable model for anything requiring nuanced judgement.
Assessed June 30, 2026
Editorial notes
Qwen3.5 4B (Reasoning) is a compact Alibaba model with surprisingly strong agentic scores for its size, ultra-low pricing at $0.03/1M input, but limited reasoning depth keeps it suited to lightweight automation tasks.
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
Performance Profile
How Qwen3.5 4B (Reasoning) compares
Qwen3.5 4B (Reasoning) ranks #135 of 385 AI models we track for overall intelligence, #78 of 139 for coding, #77 of 293 for agentic tasks. At $0.03 per million input tokens it is cheaper than 76% of comparable models.
Performance Indices
Source: Artificial Analysis
Benchmark Scores
Intelligence
Technical
Content
Benchmark data from Artificial Analysis and Hugging Face
How does Qwen3.5 4B (Reasoning) stack up?
Compare side-by-side with other professional models.
Model Information
| Provider | Alibaba |
| Release Date | March 2, 2026 |
| Status | Active |
Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $0.03 | $0.000030 |
| Output | $0.15 | $0.000150 |
Leaderboard Categories
Frequently asked questions about Qwen3.5 4B (Reasoning)
How much does Qwen3.5 4B (Reasoning) cost?
Qwen3.5 4B (Reasoning) costs $0.03 per million input tokens and $0.15 per million output tokens.
Is Qwen3.5 4B (Reasoning) good for coding?
On our coding benchmark index, Qwen3.5 4B (Reasoning) ranks #78 of 139 models, placing it in the broader range of the field for code generation and debugging.
Who created Qwen3.5 4B (Reasoning)?
Qwen3.5 4B (Reasoning) is developed by Alibaba and was released on March 2, 2026.
