# Claude 3.5 Sonnet vs Qwen3.5 Flash

> Side-by-side benchmark comparison for Claude 3.5 Sonnet and Qwen3.5 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-3-5-sonnet-vs-qwen3-5-flash
- Last updated: September 27, 2026

- Shared sourced benchmarks: 2
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Evidence is too thin for a benchmark verdict: Claude 3.5 Sonnet and Qwen3.5 Flash share only 2 sourced benchmark rows.

## Summary

- Only 2 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Qwen3.5 Flash has the lower published output-token price.
- Qwen3.5 Flash has the larger published context window at 1M.

## Model Snapshot

| Property | Claude 3.5 Sonnet | Qwen3.5 Flash |
|----------|----------|----------|
| Creator | Anthropic | Alibaba |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 200K | 1M |
| Independent public score (not head-to-head) | 29.95 | 45.49 |
| Benchmarks Covered | 4 | 6 |
| Pricing (input/output) | $3.00 / $15.00 | $0.10 / $0.40 |

## Category Breakdown

### Coding

- Winner: Insufficient shared evidence
- Claude 3.5 Sonnet public-lane score: Coming soon
- Qwen3.5 Flash public-lane score: 26.5 (Estimated · #97/135)

| Benchmark | Claude 3.5 Sonnet | Qwen3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 49% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 83.3% | Coming soon |
| SWE-bench (Vals) | Coming soon | 64.4% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Claude 3.5 Sonnet public-lane score: Coming soon
- Qwen3.5 Flash public-lane score: 43 (Estimated · #80/158)

| Benchmark | Claude 3.5 Sonnet | Qwen3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 59.4% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 82.8% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 84.1% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Claude 3.5 Sonnet public-lane score: 25.6 (Unranked · 2 rankable rows)
- Qwen3.5 Flash public-lane score: 28.4 (Unranked · 2 rankable rows)

| Benchmark | Claude 3.5 Sonnet | Qwen3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 2.069% | 6.207% | Qwen3.5 Flash |
| FrontierMath v2 (Tier 4) | 0.000% | 0.000% | Tie |

## FAQ

### Is there enough evidence to pick between Claude 3.5 Sonnet and Qwen3.5 Flash?

Not yet. The models share only 2 sourced benchmark rows, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [Claude 3.5 Sonnet vs GPT-6 Astra](/compare/claude-3-5-sonnet-vs-gpt-6-astra)
- [Qwen3.5 Flash vs GPT-6 Astra](/compare/gpt-6-astra-vs-qwen3-5-flash)
- [Claude 3.5 Sonnet vs Claude Opus 5.5](/compare/claude-3-5-sonnet-vs-claude-opus-5-5)
- [Qwen3.5 Flash vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-qwen3-5-flash)

## Explore More

- [Claude 3.5 Sonnet profile](/models/claude-3-5-sonnet)
- [Qwen3.5 Flash profile](/models/qwen3-5-flash)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)