# Claude Sonnet 4.6 vs DeepSeek V4 Flash 0731

> Side-by-side benchmark comparison for Claude Sonnet 4.6 and DeepSeek V4 Flash 0731 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-sonnet-4-6-vs-deepseek-v4-flash-0731
- Last updated: September 8, 2026

- Shared sourced benchmarks: 11
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick Claude Sonnet 4.6 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 4.6 leads overall 62.95 to 55.
- The clearest category separation is in mathematics, where the averages are 49 for Claude Sonnet 4.6 and 80 for DeepSeek V4 Flash 0731.
- The biggest single benchmark swing is HLE in Knowledge, with scores of 49% 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.
- DeepSeek V4 Flash 0731 also has the larger context window at 1M.

## Model Snapshot

| Property | Claude Sonnet 4.6 | DeepSeek V4 Flash 0731 |
|----------|----------|----------|
| Creator | Anthropic | DeepSeek |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 200K | 1M |
| Overall Score | 62.95 | null |
| Benchmarks Covered | 25 | 40 |
| Pricing (input/output) | $3.00 / $15.00 | $0.14 / $0.28 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- Claude Sonnet 4.6 public-lane score: 44 (Supported · #93/152)
- DeepSeek V4 Flash 0731 public-lane score: Coming soon

| Benchmark | Claude Sonnet 4.6 | DeepSeek V4 Flash 0731 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 59.1% | 56.9% | Claude Sonnet 4.6 |
| OSWorld-Verified | 72.1% | Coming soon | Coming soon |
| Claw-Eval | 67.8% | Coming soon | Coming soon |
| CyberGym | 65.2% | 76.7% | DeepSeek V4 Flash 0731 |
| Gert Labs | 62.92% | Coming soon | Coming soon |
| OSWorld 2.0 | 8.3% | Coming soon | Coming soon |
| JobBench | 36.9% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 57.3% | 67.0% | DeepSeek V4 Flash 0731 |
| BrowseComp | Coming soon | 73.2% | Coming soon |
| HLE w/ tools | Coming soon | 45.1% | Coming soon |
| MCP Atlas | Coming soon | 69% | Coming soon |
| Toolathlon | Coming soon | 47.8% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 82.7% | 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: Coming soon
- Claude Sonnet 4.6 public-lane score: 52.3 (Supported · #48/151)
- DeepSeek V4 Flash 0731 public-lane score: Coming soon

| Benchmark | Claude Sonnet 4.6 | DeepSeek V4 Flash 0731 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 79.6% | 79% | Claude Sonnet 4.6 |
| SWE-Rebench | 60.7% | Coming soon | Coming soon |
| React Native Evals | 80.6% | Coming soon | Coming soon |
| Vibe Code Bench | 51.48% | Coming soon | Coming soon |
| cursorBench31 | 48.8% | Coming soon | Coming soon |
| FrontierCode 1.1 Main | 24.3% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 82.1% | 87.3% | DeepSeek V4 Flash 0731 |
| SWE-bench (Vals) | 77.4% | 88.8% | DeepSeek V4 Flash 0731 |
| LiveCodeBench Pass@1-COT | Coming soon | 91.6% | Coming soon |
| Codeforces | Coming soon | 3052.0 | Coming soon |
| SWE-bench Pro | Coming soon | 52.6% | Coming soon |
| SWE Multilingual | Coming soon | 73.3% | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 56.9% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 82.7% | 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 |

### Multimodal & Grounded

- Winner: Coming soon
- Claude Sonnet 4.6 public-lane score: 54.1 (#33/48)
- DeepSeek V4 Flash 0731 public-lane score: Coming soon

| Benchmark | Claude Sonnet 4.6 | DeepSeek V4 Flash 0731 | Winner |
|-----------|-----------|-----------|--------|
| CharXiv | 77.4% | Coming soon | Coming soon |

### Reasoning

- Winner: Coming soon
- Claude Sonnet 4.6 public-lane score: 67.9 (Unranked · 2 rankable rows)
- DeepSeek V4 Flash 0731 public-lane score: Coming soon

| Benchmark | Claude Sonnet 4.6 | DeepSeek V4 Flash 0731 | Winner |
|-----------|-----------|-----------|--------|
| MRCR 1M | Coming soon | 78.7% | Coming soon |
| CorpusQA 1M | Coming soon | 60.5% | Coming soon |

### Knowledge

- Winner: Coming soon
- Claude Sonnet 4.6 public-lane score: 56 (Supported · #51/182)
- DeepSeek V4 Flash 0731 public-lane score: Coming soon

| Benchmark | Claude Sonnet 4.6 | DeepSeek V4 Flash 0731 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 89.9% | 88.1% | Claude Sonnet 4.6 |
| SuperGPQA | 95% | Coming soon | Coming soon |
| MMLU-Pro | 79.2% | 86.2% | DeepSeek V4 Flash 0731 |
| HLE | 49% | 34.8% | Claude Sonnet 4.6 |
| GPQA Diamond (Vals) | 85.6% | 89.9% | DeepSeek V4 Flash 0731 |
| MMLU-Pro (Vals) | 87.3% | 86.2% | Claude Sonnet 4.6 |
| SimpleQA | Coming soon | 34.1% | Coming soon |
| Chinese-SimpleQA | Coming soon | 78.9% | Coming soon |
| GPQA-D | Coming soon | 88.1% | Coming soon |

### Instruction Following

- Winner: Coming soon
- Claude Sonnet 4.6 public-lane score: 48.2 (#85/121)
- DeepSeek V4 Flash 0731 public-lane score: Coming soon

### Mathematics

- Winner: Coming soon
- Claude Sonnet 4.6 public-lane score: 49 (Unranked · 2 rankable rows)
- DeepSeek V4 Flash 0731 public-lane score: 80 (Unranked · 4 rankable rows)

| Benchmark | Claude Sonnet 4.6 | DeepSeek V4 Flash 0731 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 32.400% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 8.300% | Coming soon | Coming soon |
| 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 4.6 or DeepSeek V4 Flash 0731?

Claude Sonnet 4.6 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Sonnet 4.6 and DeepSeek V4 Flash 0731?

The widest category gap is in mathematics, where the averages are 49 for Claude Sonnet 4.6 and 80 for DeepSeek V4 Flash 0731.

### How many benchmarks does Claude Sonnet 4.6 cover on BenchLM?

Claude Sonnet 4.6 currently has 25 sourced benchmark scores on BenchLM.

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

DeepSeek V4 Flash 0731 currently has 40 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Sonnet 4.6 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-claude-sonnet-4-6)
- [DeepSeek V4 Flash 0731 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-deepseek-v4-flash-0731)
- [Claude Sonnet 4.6 vs GPT-6 Astra](/compare/claude-sonnet-4-6-vs-gpt-6-astra)
- [DeepSeek V4 Flash 0731 vs GPT-6 Astra](/compare/deepseek-v4-flash-0731-vs-gpt-6-astra)

## Explore More

- [Claude Sonnet 4.6 profile](/models/claude-sonnet-4-6)
- [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)