# Claude Opus 5.5 vs DeepSeek-V2.5 (Sep 2024)

> Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 37.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-opus-5-5-vs-deepseek-v2-5
- 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-V2.5 (Sep 2024) 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 33.3.
- DeepSeek-V2.5 (Sep 2024) has downloadable open weights; the other is API-only.

## Snapshot

| | Claude Opus 5.5 | DeepSeek-V2.5 (Sep 2024) |
|---|---|---|
| Provider | Anthropic | DeepSeek |
| Noometry Index | 68.5 | 37.0 |
| Rank | 3 | 197 |
| Context | 1M | — |
| Input $/M | $4 | — |
| Output $/M | $20 | — |
| Weights | Proprietary | Open |

## Coding

- Claude Opus 5.5: 71.4 (#1)
- DeepSeek-V2.5 (Sep 2024): 31.3 (#274)

| Benchmark | Claude Opus 5.5 | DeepSeek-V2.5 (Sep 2024) |
|---|---|---|
| LMArena Coding | 1545 | 1310 |
| FrontierCode | 54.4% | — |
| Aider Polyglot | — | 17.8% |
| CursorBench | 57.8% | — |
| LMArena WebDev | 1820 | — |
| FrontierSWE | 62.3% | — |
| SciCode | 66.9% | — |
| BigCodeBench Instruct | — | 48.6% |
| MirrorCode | 77.4% | — |
| BigCodeBench Complete | — | 53.2% |
| HumanEval+ | — | 83.5% |
| MBPP+ | — | 74.1% |

## Agentic & Tool Use

- Claude Opus 5.5: 45.3 (#13)
- DeepSeek-V2.5 (Sep 2024): —

| Benchmark | Claude Opus 5.5 | DeepSeek-V2.5 (Sep 2024) |
|---|---|---|
| APEX-Agents | 73.5% | — |
| GDP.pdf | 30.6% | — |

## Reasoning

- Claude Opus 5.5: 79.5 (#2)
- DeepSeek-V2.5 (Sep 2024): 24.5 (#145)

| Benchmark | Claude Opus 5.5 | DeepSeek-V2.5 (Sep 2024) |
|---|---|---|
| LMArena Hard Prompts | 1545 | 1289 |
| 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% | — |

## Math

- Claude Opus 5.5: 92.4 (#2)
- DeepSeek-V2.5 (Sep 2024): 33.3 (#177)

| Benchmark | Claude Opus 5.5 | DeepSeek-V2.5 (Sep 2024) |
|---|---|---|
| FrontierMath (Tiers 1-3) | 91.2% | — |
| FrontierMath Tier 4 | 95% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
| LMArena Math | — | 1289 |

## Knowledge

- Claude Opus 5.5: 66.6 (#9)
- DeepSeek-V2.5 (Sep 2024): 34.2 (#190)

| Benchmark | Claude Opus 5.5 | DeepSeek-V2.5 (Sep 2024) |
|---|---|---|
| LMArena Expert | 1564 | 1266 |
| GPQA Diamond | 90.6% | — |
| SimpleQA Verified | 72.2% | — |

## Multimodal

- Claude Opus 5.5: 56.5 (#2)
- DeepSeek-V2.5 (Sep 2024): —

| Benchmark | Claude Opus 5.5 | DeepSeek-V2.5 (Sep 2024) |
|---|---|---|
| Furniture Assembly | 83.3% | — |

## Multilingual

- Claude Opus 5.5: 59.8 (#1)
- DeepSeek-V2.5 (Sep 2024): 42.7 (#188)

| Benchmark | Claude Opus 5.5 | DeepSeek-V2.5 (Sep 2024) |
|---|---|---|
| LMArena Non-English | 1513 | 1273 |
| LMArena Chinese | 1572 | 1317 |
| LMArena Russian | 1532 | 1289 |
| LMArena French | — | 1288 |
| LMArena German | — | 1258 |
| LMArena Japanese | — | 1228 |
| LMArena Korean | — | 1209 |
| LMArena Spanish | — | 1248 |

## Instruction Following

- Claude Opus 5.5: 80.1 (#2)
- DeepSeek-V2.5 (Sep 2024): 67.7 (#189)

| Benchmark | Claude Opus 5.5 | DeepSeek-V2.5 (Sep 2024) |
|---|---|---|
| LMArena Instruction Following | 1535 | 1280 |

## Long Context

- Claude Opus 5.5: 47.3 (#18)
- DeepSeek-V2.5 (Sep 2024): 39.5 (#169)

| Benchmark | Claude Opus 5.5 | DeepSeek-V2.5 (Sep 2024) |
|---|---|---|
| LMArena Longer Query | 1540 | 1301 |

## Writing & Preference

- Claude Opus 5.5: 78.7 (#3)
- DeepSeek-V2.5 (Sep 2024): 50.0 (#182)

| Benchmark | Claude Opus 5.5 | DeepSeek-V2.5 (Sep 2024) |
|---|---|---|
| LMArena Text | 1518 | 1294 |
| LMArena Creative Writing | 1538 | 1285 |
| LMArena Multi-Turn | 1520 | 1297 |
| EQ-Bench Creative Writing | 2050 | — |

## FAQ

### Is Claude Opus 5.5 better than DeepSeek-V2.5 (Sep 2024)?

Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 37.0 on the Noometry Index.

### Is Claude Opus 5.5 or DeepSeek-V2.5 (Sep 2024) better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.4 versus 31.3 in the Noometry coding category.

### How many benchmarks do Claude Opus 5.5 and DeepSeek-V2.5 (Sep 2024) share?

11 benchmarks have published results for both models. Claude Opus 5.5 has 35 scored results on Noometry and DeepSeek-V2.5 (Sep 2024) has 22.