Qwen3.5 4B (Reasoning)
Analysis Summary
Qwen3.5 4B Reasoning is a compact reasoning model in Alibaba's Qwen3.5 line. Its listed prices are low, and the supplied results show some instruction-following and tool-task performance. Its overall intelligence and coding measurements are limited, however, and the data does not list function calling, vision, or context capacity. Its reasoning label alone should not be taken as evidence that it can handle complex analysis reliably.
It may suit short, constrained tasks where cost is important and outputs can be checked, such as simple internal text processing. It is a poor fit for complex coding, long documents, autonomous agents, or unreviewed client-facing content. Treat it as a candidate for inexpensive volume only after a task-specific evaluation establishes acceptable quality, and keep a stronger fallback available for ambiguous or high-impact requests.
Assessed September 23, 2026
Editorial notes
Qwen3.5 4B Reasoning offers low-cost inference and some measured instruction-following and task performance, but its coding and overall reasoning results limit it to simpler workloads.
The DFO score ranks models on the Artificial Analysis Intelligence Index and is refreshed as new models launch. The write-up and verdict are our own. Feedback?
DFO Verdict
Qwen3.5 4B Reasoning offers low-cost inference and some measured instruction-following and task performance, but its coding and overall reasoning results limit it to simpler workloads.
Benchmarks
Artificial Analysis data refreshed Oct 23, 2026. Arena ratings from the Oct 20, 2026 text leaderboard, with style control. Bars: magenta = reasoning, ink = coding and agents, cyan = instructions and long context.
How Qwen3.5 4B (Reasoning) compares
Qwen3.5 4B (Reasoning) ranks #188 of 443 AI models we track for overall intelligence, #127 of 198 for coding. At $0.03 per million input tokens it is cheaper than 76% of comparable models.
Dark bar = input · light bar = output, scaled to the priciest peer.
1M tokens ≈ 8 full-length novels or ~2,500 pages of business documents in a single request.
Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $0.03 | $0.000030 |
| Output | $0.15 | $0.000150 |
What would Qwen3.5 4B (Reasoning) cost your business?
Pick the job that looks most like yours, then fine-tune with the sliders. Estimates update live.
A website chatbot handling around 100 customer conversations a day, a few short messages each.
Full calculator with 718 models → Price Calculator
These numbers get smaller with the right architecture.
We route routine calls to cheap models and save Qwen3.5 4B (Reasoning) for the hard ones. Most clients cut their estimate by 60-80%.
Talk to our teamFrequently 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 #127 of 198 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.