# Claude Sonnet 5.5 vs Deepseek Coder v2

> Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 35.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-sonnet-5-5-vs-deepseek-coder-v2
- Last updated: 2026-10-10
- Shared benchmarks: 12

## Summary

- They share 12 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 8 categories and Deepseek Coder v2 in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Sonnet 5.5 leads 87.9 to 34.9.
- Deepseek Coder v2 has downloadable open weights; the other is API-only.

## Snapshot

| | Claude Sonnet 5.5 | Deepseek Coder v2 |
|---|---|---|
| Provider | Anthropic | DeepSeek |
| Noometry Index | 61.9 | 35.9 |
| Rank | 10 | 220 |
| Context | 1M | — |
| Input $/M | $2 | — |
| Output $/M | $10 | — |
| Weights | Proprietary | Open |

## Coding

- Claude Sonnet 5.5: 67.3 (#6)
- Deepseek Coder v2: 38.1 (#183)

| Benchmark | Claude Sonnet 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Coding | 1513 | 1251 |
| FrontierCode | 52.1% | — |
| CursorBench | 55.5% | — |
| LMArena WebDev | 1774 | — |
| FrontierSWE | 61.9% | — |
| SciCode | 61% | — |
| BigCodeBench Instruct | — | 48.2% |
| BigCodeBench Complete | — | 59.7% |
| ALE-Bench | 1,819 | — |
| HumanEval+ | — | 82.3% |
| MBPP+ | — | 75.1% |

## Agentic & Tool Use

- Claude Sonnet 5.5: 45.0 (#16)
- Deepseek Coder v2: —

| Benchmark | Claude Sonnet 5.5 | Deepseek Coder v2 |
|---|---|---|
| APEX-Agents | 75.5% | — |

## Reasoning

- Claude Sonnet 5.5: 54.0 (#28)
- Deepseek Coder v2: 23.6 (#176)

| Benchmark | Claude Sonnet 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Hard Prompts | 1495 | 1207 |
| NYT Connections (extended) | 80.5% | — |
| CritPt | 31.4% | — |
| Mystery Game Puzzles | 65% | — |
| Epoch Capabilities Index | 165.03 | — |
| WinoGrande | — | 83.7% |

## Math

- Claude Sonnet 5.5: 87.9 (#6)
- Deepseek Coder v2: 34.9 (#190)

| Benchmark | Claude Sonnet 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Math | 1510 | 1241 |
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
| FrontierMath Erdős | 2.9% | — |
| GSM8K | — | 94.5% |

## Knowledge

- Claude Sonnet 5.5: 66.0 (#12)
- Deepseek Coder v2: 32.3 (#212)

| Benchmark | Claude Sonnet 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Expert | 1540 | 1181 |
| GPQA Diamond | 95.6% | — |
| SimpleQA Verified | 46.5% | — |
| ARC (AI2) Challenge | — | 64.3% |

## Multimodal

- Claude Sonnet 5.5: 51.5 (#6)
- Deepseek Coder v2: —

| Benchmark | Claude Sonnet 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Vision | 1289 | — |
| Furniture Assembly | 75% | — |

## Multilingual

- Claude Sonnet 5.5: 55.3 (#30)
- Deepseek Coder v2: 36.3 (#240)

| Benchmark | Claude Sonnet 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Non-English | 1452 | 1182 |
| LMArena Chinese | 1522 | 1201 |
| LMArena Russian | 1451 | 1188 |
| LMArena French | — | 1185 |
| LMArena German | — | 1164 |
| LMArena Japanese | — | 1126 |
| LMArena Korean | — | 1104 |
| LMArena Spanish | — | 1153 |

## Instruction Following

- Claude Sonnet 5.5: 78.3 (#11)
- Deepseek Coder v2: 61.7 (#242)

| Benchmark | Claude Sonnet 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Instruction Following | 1495 | 1180 |

## Long Context

- Claude Sonnet 5.5: 45.9 (#28)
- Deepseek Coder v2: 37.0 (#224)

| Benchmark | Claude Sonnet 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Longer Query | 1498 | 1219 |

## Writing & Preference

- Claude Sonnet 5.5: 66.0 (#40)
- Deepseek Coder v2: 38.2 (#253)

| Benchmark | Claude Sonnet 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Text | 1471 | 1191 |
| LMArena Creative Writing | 1465 | 1120 |
| LMArena Multi-Turn | 1474 | 1177 |

## FAQ

### Is Claude Sonnet 5.5 better than Deepseek Coder v2?

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 35.9 on the Noometry Index.

### Is Claude Sonnet 5.5 or Deepseek Coder v2 better for coding?

Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 38.1 in the Noometry coding category.

### How many benchmarks do Claude Sonnet 5.5 and Deepseek Coder v2 share?

12 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and Deepseek Coder v2 has 24.