# Claude Sonnet 5 vs DeepSeek V4 Flash 0731

> Side-by-side benchmark comparison for Claude Sonnet 5 and DeepSeek V4 Flash 0731 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-sonnet-5-vs-deepseek-v4-flash-0731
- Last updated: September 27, 2026

- Shared sourced benchmarks: 13
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick Claude Sonnet 5 if you want the stronger benchmark profile. DeepSeek V4 Flash 0731 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Claude Sonnet 5 leads overall 67.01 to 57.
- The clearest category separation is in reasoning, where the averages are 78.4 for Claude Sonnet 5 and 57 for DeepSeek V4 Flash 0731.
- The biggest single benchmark swing is HLE in Knowledge, with scores of 57.4% and 34.8%.
- DeepSeek V4 Flash 0731 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | Claude Sonnet 5 | DeepSeek V4 Flash 0731 |
|----------|----------|----------|
| Creator | Anthropic | DeepSeek |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 67.01 | null |
| Benchmarks Covered | 26 | 42 |
| Pricing (input/output) | $2.00 / $10.00 | $0.14 / $0.28 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- Claude Sonnet 5 public-lane score: 64.2 (Supported · #12/105)
- DeepSeek V4 Flash 0731 public-lane score: Coming soon

| Benchmark | Claude Sonnet 5 | DeepSeek V4 Flash 0731 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 14.6% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 80.4% | 82.7% | DeepSeek V4 Flash 0731 |
| BrowseComp | 84.7% | 73.2% | Claude Sonnet 5 |
| HLE w/ tools | 57.4% | 45.1% | Claude Sonnet 5 |
| OSWorld-Verified | 81.2% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 74.5% | 67.0% | Claude Sonnet 5 |
| ApprenticeBench | 16% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 56.9% | Coming soon |
| MCP Atlas | Coming soon | 69% | Coming soon |
| Toolathlon | Coming soon | 47.8% | Coming soon |
| CyberGym | Coming soon | 76.7% | Coming soon |
| Toolathlon-Verified | Coming soon | 70.3% | Coming soon |
| Agents' Last Exam | Coming soon | 25.2% | Coming soon |
| AutomationBench | Coming soon | 25.1% | Coming soon |

### Coding

- Winner: Not comparable
- Claude Sonnet 5 public-lane score: 60.8 (Supported · #15/135)
- DeepSeek V4 Flash 0731 public-lane score: Coming soon

| Benchmark | Claude Sonnet 5 | DeepSeek V4 Flash 0731 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 85.2% | 79% | Claude Sonnet 5 |
| SWE-bench Pro | 63.2% | 52.6% | Claude Sonnet 5 |
| SWE Multilingual | 78.3% | 73.3% | Claude Sonnet 5 |
| SWE Multimodal | 28.1% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 80.4% | 82.7% | DeepSeek V4 Flash 0731 |
| FrontierCode 1.1 Main | 42.7% | Coming soon | Coming soon |
| cursorBench32 | 61.5% | Coming soon | Coming soon |
| VulcanBench CII v1 | 89.2% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 82.4% | 87.3% | DeepSeek V4 Flash 0731 |
| SWE-bench (Vals) | 79.6% | 88.8% | DeepSeek V4 Flash 0731 |
| cursorBench40 | 34.1% | Coming soon | Coming soon |
| LiveCodeBench Pass@1-COT | Coming soon | 91.6% | Coming soon |
| Codeforces | Coming soon | 3052.0 | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 56.9% | Coming soon |
| NL2Repo | Coming soon | 54.2% | Coming soon |
| DeepSWE | Coming soon | 54.4% | Coming soon |
| DSBench-FullStack | Coming soon | 68.7% | Coming soon |
| DSBench-Hard | Coming soon | 59.6% | Coming soon |
| VulcanBench v3 | Coming soon | 88.4% | Coming soon |
| OpenHarmony Bench | Coming soon | 53.8% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Sonnet 5 public-lane score: 78.4 (Unranked · 2 rankable rows)
- DeepSeek V4 Flash 0731 public-lane score: 57 (Unranked · 4 rankable rows)

| Benchmark | Claude Sonnet 5 | DeepSeek V4 Flash 0731 | Winner |
|-----------|-----------|-----------|--------|
| MRCR 1M | Coming soon | 78.7% | Coming soon |
| CorpusQA 1M | Coming soon | 60.5% | Coming soon |
| ARC-AGI-1 | Coming soon | 89.00% | Coming soon |
| ARC-AGI-2 | Coming soon | 61.4% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Claude Sonnet 5 public-lane score: 77.4 (#15/50)
- DeepSeek V4 Flash 0731 public-lane score: Coming soon

| Benchmark | Claude Sonnet 5 | DeepSeek V4 Flash 0731 | Winner |
|-----------|-----------|-----------|--------|
| CharXiv | 88.3% | Coming soon | Coming soon |
| CharXiv w/o tools | 77% | Coming soon | Coming soon |

### Knowledge

- Winner: Not comparable
- Claude Sonnet 5 public-lane score: 64.5 (Supported · #23/158)
- DeepSeek V4 Flash 0731 public-lane score: Coming soon

| Benchmark | Claude Sonnet 5 | DeepSeek V4 Flash 0731 | Winner |
|-----------|-----------|-----------|--------|
| HLE | 57.4% | 34.8% | Claude Sonnet 5 |
| HLE w/o tools | 43.2% | Coming soon | Coming soon |
| HLE-Verified | 31.0% | Coming soon | Coming soon |
| LABBench2 | 80.1% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 88.9% | 89.9% | DeepSeek V4 Flash 0731 |
| MMLU-Pro (Vals) | 87.5% | 86.2% | Claude Sonnet 5 |
| MMLU-Pro | Coming soon | 86.2% | Coming soon |
| SimpleQA | Coming soon | 34.1% | Coming soon |
| Chinese-SimpleQA | Coming soon | 78.9% | Coming soon |
| GPQA | Coming soon | 88.1% | Coming soon |
| GPQA-D | Coming soon | 88.1% | Coming soon |

### Mathematics

- Winner: Not comparable
- Claude Sonnet 5 public-lane score: Coming soon
- DeepSeek V4 Flash 0731 public-lane score: 79.9 (Unranked · 4 rankable rows)

| Benchmark | Claude Sonnet 5 | DeepSeek V4 Flash 0731 | Winner |
|-----------|-----------|-----------|--------|
| HMMT Feb 2026 | Coming soon | 94.8% | Coming soon |
| IMOAnswerBench | Coming soon | 88.4% | Coming soon |
| Apex | Coming soon | 33.0% | Coming soon |
| Apex Shortlist | Coming soon | 85.7% | Coming soon |

## FAQ

### Which is better overall, Claude Sonnet 5 or DeepSeek V4 Flash 0731?

Claude Sonnet 5 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Sonnet 5 and DeepSeek V4 Flash 0731?

The widest category gap is in reasoning, where the averages are 78.4 for Claude Sonnet 5 and 57 for DeepSeek V4 Flash 0731.

### How many benchmarks does Claude Sonnet 5 cover on BenchLM?

Claude Sonnet 5 currently has 26 sourced benchmark scores on BenchLM.

### How many benchmarks does DeepSeek V4 Flash 0731 cover on BenchLM?

DeepSeek V4 Flash 0731 currently has 42 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Sonnet 5 vs GPT-6 Astra](/compare/claude-sonnet-5-vs-gpt-6-astra)
- [DeepSeek V4 Flash 0731 vs GPT-6 Astra](/compare/deepseek-v4-flash-0731-vs-gpt-6-astra)
- [Claude Sonnet 5 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-claude-sonnet-5)
- [DeepSeek V4 Flash 0731 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-deepseek-v4-flash-0731)

## Explore More

- [Claude Sonnet 5 profile](/models/claude-sonnet-5)
- [DeepSeek V4 Flash 0731 profile](/models/deepseek-v4-flash-0731)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)