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Alibaba Qwen: Qwen3.5 4B

Small Qwen3.5 multimodal model for low-cost chat, reasoning, and tool use

Source-linked qwen Open weights Apache-2.0 Released 2026-03-02
API record Report
InputT
OutputT
Input price$0.04/M
Output price$0.07/M
Context262.144K
Max output81.92K
Providers5
Inference availability

Providers

Provider-specific identifiers, limits, and listed prices per million tokens. Every row links back to the provider's own documentation.

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Providers offering Qwen3.5 4B
ProviderProvider model IDContextMax outputInputOutputCache readCapabilitiesDocs
QVAC qwen3.5-4b 32.768K 8.192K — — — Tools Docs ↗
Merge Gateway qwen/qwen3.5-4b 262.144K 32.768K $0.04 $0.07 — ReasoningTools Docs ↗
EmpirioLabs AI qwen3-5-4b 262.144K 32.768K $0.04 $0.07 $0.02 ReasoningToolsJSON Docs ↗
Thinking Machines Qwen/Qwen3.5-4B 65.536K 65.536K $0.33 $1.005 $0.066 ReasoningTools Docs ↗
Thinking Machines Qwen/Qwen3.5-4B:peft:262144 262.144K 262.144K $0.33 $1.005 $0.066 ReasoningTools Docs ↗

Capability badges appear only where the provider catalog explicitly lists support. A blank cell means the source is silent, not that the feature is absent.

Listed rates

Price across providers

Input price per million tokens as published by each provider. Bars are drawn from listed rates only — no traffic weighting, since the catalog observes no requests.

Lowest input $0.04/M

Across 4 priced providers

Median input $0.185/M

Midpoint of listed rates

Highest input $0.33/M

8.2× the lowest listed rate

Output range $0.07 – $1.005

Per million output tokens

Merge Gateway $0.04/M
EmpirioLabs AI $0.04/M
Thinking Machines $0.33/M
Thinking Machines $0.33/M
Cost calculator

Estimate a workload

$0.00
Excludes taxes, non-token charges, and tiered discounts.

2 providers list the identical $0.04 input rate, so price alone will not separate them — compare context limits, max output, and capabilities above.

Context limits also differ by provider, from 32.768K to 262.144K tokens. Compare the provider table above before choosing on price alone.

Specification

Capabilities

Recorded from the source catalog and provider listings.

✓ Reasoning Yes
✓ Tool calling Yes
? Structured output Unknown
✓ Attachments Yes
✓ Vision input Yes
✓ Open weights Yes
Model family
qwen
Knowledge cutoff
Not documented
License
Apache-2.0
Release date
2026-03-02
Model ID
alibaba/qwen3.5-4b

Weights: Hugging Face ↗

Published evaluations

Benchmarks

Every result stays attached to its source, version, metric and harness. Scores from different versions are never merged, and the profile below plots each benchmark against its own population rather than on a shared scale.

Benchmark registry
No published benchmark results

ModelBench does not infer quality from price, context size, or model name. When a source publishes a comparable result, it appears here with its version and link.

Read the methodology
Catalog activity

Change log

Field-level changes detected between successful source imports.

Full change log
No changes recorded

This record has not changed within the retained import history.

Public API

Use this record

Fetch the complete source-linked model record. No key, no account, no rate-limited tier.

API documentation
Endpoint
GET https://modelbench.lol/api/v1/models/alibaba/qwen3.5-4b
curl
curl "https://modelbench.lol/api/v1/models/alibaba/qwen3.5-4b"
Common questions

Frequently asked questions

Answered directly from the stored record — nothing here is generated beyond the catalog's own fields.

What is Qwen3.5 4B?

Small Qwen3.5 multimodal model for low-cost chat, reasoning, and tool use. It is published by Alibaba Qwen and catalogued here from Models.dev.

How much does Qwen3.5 4B cost?

Listed input pricing starts at $0.04 per million tokens from Merge Gateway, rising to $0.33 across 4 listed providers.

What is the context length of Qwen3.5 4B?

Qwen3.5 4B accepts up to 262.144K tokens of context and returns up to 81.92K output tokens.

Does Qwen3.5 4B support tool calling and structured output?

Provider catalogs list support for tool calling, reasoning, and image input.

Which providers serve Qwen3.5 4B?

4 providers list this model: QVAC, Merge Gateway, EmpirioLabs AI, Thinking Machines.

Are the weights for Qwen3.5 4B open?

Yes. The weights are published and downloadable from Hugging Face under the Apache-2.0 license.

When was Qwen3.5 4B released?

The catalog records a release date of 2026-03-02, last verified Oct 24, 2026.

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