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Claude Sonnet 4 vs Qwen3.5-4B

Claude Sonnet 4 leads the LLM Stats Score 24.3 to 19.4.

Anthropic · Alibaba Cloud / Qwen Team · Updated for 2026

Which is better?

Claude Sonnet 4 leads the overall LLM Stats Score 24.3 to 19.4, ranking #157 overall.

The models split the 2 individual benchmarks reported for both models evenly.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Claude Sonnet 4

  • overall performance matters — it scores 24.3 and ranks #157 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes

Choose Qwen3.5-4B

  • you want the most recent training data — it shipped Mar 2026
  • you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

Claude Sonnet 4
Anthropic
Qwen3.5-4B
Alibaba Cloud / Qwen Team
Core performance indexes
LLM Stats Score
24.3
#157
19.4
#194
Reasoning
24.4
#149
19.8
#186
Agents
5.9
#135
4.0
#149
Cost, coverage & limits
Benchmark wins
1 of 2
1 of 2
Input price
$3.00 / M
— / M
Output price
$15.00 / M
— / M
Context window
200,000
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
Claude Sonnet 4
Qwen3.5-4B
Math
16.1#203
19.9#154
Tool use
18.6#60
6.1#140
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

8 reported for Claude Sonnet 4 · 25 for Qwen3.5-4B

2 shared

Claude Sonnet 4 outperforms in 1 benchmarks (MMMLU), while Qwen3.5-4B is better at 1 benchmark (GPQA).

Both models are evenly matched across the benchmarks.

Sun Sep 06 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Claude Sonnet 4 specifies input context (200,000 tokens). Only Claude Sonnet 4 specifies output context (64,000 tokens).

Anthropic
Claude Sonnet 4
Input200,000 tokens
Output64,000 tokens
Alibaba Cloud / Qwen Team
Qwen3.5-4B
Input- tokens
Output- tokens
Sun Sep 06 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Sonnet 4 and Qwen3.5-4B support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Claude Sonnet 4

Text
Images
Audio
Video

Qwen3.5-4B

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Sonnet 4 is licensed under a proprietary license, while Qwen3.5-4B uses Apache 2.0.

License differences may affect how you can use these models in commercial or open-source projects.

Claude Sonnet 4

Proprietary

Closed source

Qwen3.5-4B

Apache 2.0

Open weights

Release Timeline

When each model was launched

Claude Sonnet 4 was released on 2025-05-22, while Qwen3.5-4B was released on 2026-03-02.

Qwen3.5-4B is 9 months newer than Claude Sonnet 4.

Claude Sonnet 4

May 22, 2025

1.3 years ago

Qwen3.5-4B

Mar 2, 2026

6 months ago

9mo newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Claude Sonnet 4 and Qwen3.5-4B side-by-side, then vote on the output you prefer.

Claude Sonnet 4
✓ Preferred
Qwen3.5-4B
Open in Playground

FAQ

Common questions about Claude Sonnet 4 vs Qwen3.5-4B.

Which is better, Claude Sonnet 4 or Qwen3.5-4B?

Claude Sonnet 4 leads the LLM Stats Score 24.3 to 19.4. Claude Sonnet 4 is made by Anthropic and Qwen3.5-4B is made by Alibaba Cloud / Qwen Team. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Sonnet 4 compare to Qwen3.5-4B in benchmarks?

Claude Sonnet 4 scores MMMLU: 86.5%, TAU-bench Retail: 80.5%, GPQA: 75.4%, MMMU: 74.4%, SWE-Bench Verified: 72.7%. Qwen3.5-4B scores IFEval: 89.8%, MMLU-Redux: 88.8%, C-Eval: 85.1%, t2-bench: 79.9%, MMLU-Pro: 79.1%.

What are the context window sizes for Claude Sonnet 4 and Qwen3.5-4B?

Claude Sonnet 4 supports 200K tokens and Qwen3.5-4B supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Sonnet 4 and Qwen3.5-4B?

Key differences include LLM Stats Score (24.3 vs 19.4), licensing (Proprietary vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Sonnet 4 and Qwen3.5-4B?

Claude Sonnet 4 is developed by Anthropic and Qwen3.5-4B is developed by Alibaba Cloud / Qwen Team.

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