Model comparison
Claude Opus 5.5 vs Deepseek Coder v2
Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 35.9 on the Noometry Index.
Last verified . 14 shared benchmarks.
DeepSeekSummary
- They share 14 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 91.8 to 34.9.
- Deepseek Coder v2 has downloadable open weights; the other is API-only.
Side by side
| Claude Opus 5.5 | Deepseek Coder v2 | |
|---|---|---|
| Provider | Anthropic | DeepSeek |
| Noometry Index | 68.6 | 35.9 |
| Released | 2026-09-22 | 2024-06-17 |
| Weights | Proprietary | Open |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $4 | — |
| Output $ / M tokens | $20 | — |
| Results tracked | 44 | 24 |
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Category by category
Coding Claude Opus 5.5 leads
Claude Opus 5.5: 71.9 (#3), Deepseek Coder v2: 38.1 (#183)
| Benchmark | Claude Opus 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Coding | 1547 | 1251 |
| FrontierCode | 54.6% | — |
| CursorBench | 57.8% | — |
| LMArena WebDev | 1813 | — |
| FrontierSWE | 62.3% | — |
| SciCode | 66.9% | — |
| BigCodeBench Instruct | — | 48.2% |
| MirrorCode | 77.4% | — |
| BigCodeBench Complete | — | 59.7% |
| ALE-Bench | 2,147 | — |
| HumanEval+ | — | 82.3% |
| MBPP+ | — | 75.1% |
Agentic & Tool Use Not comparable
Claude Opus 5.5: 45.3 (#15), Deepseek Coder v2: —
| Benchmark | Claude Opus 5.5 | Deepseek Coder v2 |
|---|---|---|
| APEX-Agents | 73.5% | — |
| GDP.pdf | 30.6% | — |
| Vending-Bench 2 | 9,235 | — |
Reasoning Claude Opus 5.5 leads
Claude Opus 5.5: 80.2 (#3), Deepseek Coder v2: 23.6 (#176)
| Benchmark | Claude Opus 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Hard Prompts | 1535 | 1207 |
| ARC-AGI-2 | 93.3% | — |
| NYT Connections (extended) | 88.5% | — |
| ARC-AGI-1 | 98.5% | — |
| CritPt | 31.7% | — |
| EBR-Bench | 71.4% | — |
| Mystery Game Puzzles | 71% | — |
| DTBench | 98.9% | — |
| LMCA | 68.2% | — |
| Epoch Capabilities Index | 167.33 | — |
| WinoGrande | — | 83.7% |
Math Claude Opus 5.5 leads
Claude Opus 5.5: 91.8 (#3), Deepseek Coder v2: 34.9 (#190)
| Benchmark | Claude Opus 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Math | 1506 | 1241 |
| FrontierMath (Tiers 1-3) | 91.2% | — |
| FrontierMath Tier 4 | 95% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
| FrontierMath Erdős | 2.9% | — |
| GSM8K | — | 94.5% |
Knowledge Claude Opus 5.5 leads
Claude Opus 5.5: 66.4 (#10), Deepseek Coder v2: 32.3 (#212)
| Benchmark | Claude Opus 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Expert | 1547 | 1181 |
| GPQA Diamond | 90.6% | — |
| SimpleQA Verified | 72.2% | — |
| ARC (AI2) Challenge | — | 64.3% |
Multimodal Not comparable
Claude Opus 5.5: 57.8 (#1), Deepseek Coder v2: —
| Benchmark | Claude Opus 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Vision | 1321 | — |
| Blueprint-Bench 2 | 51.2% | — |
| Furniture Assembly | 83.3% | — |
Multilingual Claude Opus 5.5 leads
Claude Opus 5.5: 59.1 (#2), Deepseek Coder v2: 36.3 (#240)
| Benchmark | Claude Opus 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Non-English | 1507 | 1182 |
| LMArena Chinese | 1588 | 1201 |
| LMArena French | 1514 | 1185 |
| LMArena Russian | 1520 | 1188 |
| LMArena Spanish | 1507 | 1153 |
| LMArena German | — | 1164 |
| LMArena Japanese | — | 1126 |
| LMArena Korean | — | 1104 |
Instruction Following Claude Opus 5.5 leads
Claude Opus 5.5: 80.0 (#3), Deepseek Coder v2: 61.7 (#242)
| Benchmark | Claude Opus 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Instruction Following | 1537 | 1180 |
Long Context Claude Opus 5.5 leads
Claude Opus 5.5: 47.1 (#19), Deepseek Coder v2: 37.0 (#224)
| Benchmark | Claude Opus 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Longer Query | 1532 | 1219 |
Writing & Preference Claude Opus 5.5 leads
Claude Opus 5.5: 78.2 (#3), Deepseek Coder v2: 38.2 (#253)
| Benchmark | Claude Opus 5.5 | Deepseek Coder v2 |
|---|---|---|
| LMArena Text | 1515 | 1191 |
| LMArena Creative Writing | 1533 | 1120 |
| LMArena Multi-Turn | 1499 | 1177 |
| EQ-Bench Creative Writing | 2050 | — |
Frequently asked questions
Is Claude Opus 5.5 better than Deepseek Coder v2?
Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 35.9 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: 71.9 versus 38.1 in the Noometry coding category.
How many benchmarks do Claude Opus 5.5 and Deepseek Coder v2 share?
14 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and Deepseek Coder v2 has 24.