# Claude Opus 5.5 vs Deepseek Coder v2

> Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 35.3 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-opus-5-5-vs-deepseek-coder-v2
- Last updated: 2026-10-10
- Shared benchmarks: 11

## Summary

- They share 11 benchmarks with published results for both. Claude Opus 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 Opus 5.5 leads 92.4 to 32.3.
- Deepseek Coder v2 has downloadable open weights; the other is API-only.

## Snapshot

| | Claude Opus 5.5 | Deepseek Coder v2 |
|---|---|---|
| Provider | Anthropic | DeepSeek |
| Noometry Index | 68.5 | 35.3 |
| Rank | 3 | 217 |
| Context | 1M | — |
| Input $/M | $4 | — |
| Output $/M | $20 | — |
| Weights | Proprietary | Open |

## Coding

- Claude Opus 5.5: 71.4 (#1)
- Deepseek Coder v2: 37.5 (#178)

| Benchmark | Claude Opus 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Coding | 1545 | 1251 |
| FrontierCode | 54.4% | — |
| CursorBench | 57.8% | — |
| LMArena WebDev | 1820 | — |
| FrontierSWE | 62.3% | — |
| SciCode | 66.9% | — |
| BigCodeBench Instruct | — | 48.2% |
| MirrorCode | 77.4% | — |
| BigCodeBench Complete | — | 59.7% |
| HumanEval+ | — | 82.3% |
| MBPP+ | — | 75.1% |

## Agentic & Tool Use

- Claude Opus 5.5: 45.3 (#13)
- Deepseek Coder v2: —

| Benchmark | Claude Opus 5.5 | Deepseek Coder v2 |
|---|---|---|
| APEX-Agents | 73.5% | — |
| GDP.pdf | 30.6% | — |

## Reasoning

- Claude Opus 5.5: 79.5 (#2)
- Deepseek Coder v2: 22.6 (#175)

| Benchmark | Claude Opus 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Hard Prompts | 1545 | 1207 |
| ARC-AGI-2 | 92.5% | — |
| NYT Connections (extended) | 88.5% | — |
| ARC-AGI-1 | 97.5% | — |
| CritPt | 31.7% | — |
| EBR-Bench | 71.4% | — |
| Mystery Game Puzzles | 71% | — |
| DTBench | 98.9% | — |
| LMCA | 68.2% | — |
| WinoGrande | — | 83.7% |

## Math

- Claude Opus 5.5: 92.4 (#2)
- Deepseek Coder v2: 32.3 (#188)

| Benchmark | Claude Opus 5.5 | Deepseek Coder v2 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 91.2% | — |
| FrontierMath Tier 4 | 95% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
| LMArena Math | — | 1241 |
| GSM8K | — | 94.5% |

## Knowledge

- Claude Opus 5.5: 66.6 (#9)
- Deepseek Coder v2: 31.7 (#209)

| Benchmark | Claude Opus 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Expert | 1564 | 1181 |
| GPQA Diamond | 90.6% | — |
| SimpleQA Verified | 72.2% | — |
| ARC (AI2) Challenge | — | 64.3% |

## Multimodal

- Claude Opus 5.5: 56.5 (#2)
- Deepseek Coder v2: —

| Benchmark | Claude Opus 5.5 | Deepseek Coder v2 |
|---|---|---|
| Furniture Assembly | 83.3% | — |

## Multilingual

- Claude Opus 5.5: 59.8 (#1)
- Deepseek Coder v2: 36.4 (#235)

| Benchmark | Claude Opus 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Non-English | 1513 | 1182 |
| LMArena Chinese | 1572 | 1201 |
| LMArena Russian | 1532 | 1188 |
| LMArena French | — | 1184 |
| LMArena German | — | 1164 |
| LMArena Japanese | — | 1126 |
| LMArena Korean | — | 1104 |
| LMArena Spanish | — | 1153 |

## Instruction Following

- Claude Opus 5.5: 80.1 (#2)
- Deepseek Coder v2: 61.9 (#237)

| Benchmark | Claude Opus 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Instruction Following | 1535 | 1180 |

## Long Context

- Claude Opus 5.5: 47.3 (#18)
- Deepseek Coder v2: 37.0 (#219)

| Benchmark | Claude Opus 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Longer Query | 1540 | 1219 |

## Writing & Preference

- Claude Opus 5.5: 78.7 (#3)
- Deepseek Coder v2: 38.4 (#249)

| Benchmark | Claude Opus 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Text | 1518 | 1191 |
| LMArena Creative Writing | 1538 | 1120 |
| LMArena Multi-Turn | 1520 | 1176 |
| EQ-Bench Creative Writing | 2050 | — |

## FAQ

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

Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 35.3 on the Noometry Index.

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

Claude Opus 5.5 scores higher on coding benchmarks: 71.4 versus 37.5 in the Noometry coding category.

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

11 benchmarks have published results for both models. Claude Opus 5.5 has 35 scored results on Noometry and Deepseek Coder v2 has 24.