Model comparison
Amazon Nova Experimental Chat 10 20 vs Claude Opus 5.5
Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 41.5 on the Noometry Index.
Last verified . 11 shared benchmarks.
Summary
- They share 11 benchmarks with published results for both. Amazon Nova Experimental Chat 10 20 scores higher in 0 categories and Claude Opus 5.5 in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Opus 5.5 leads 92.4 to 36.2.
Side by side
| Amazon Nova Experimental Chat 10 20 | Claude Opus 5.5 | |
|---|---|---|
| Provider | Amazon | Anthropic |
| Noometry Index | 41.5 | 68.5 |
| Released | — | 2026-09-22 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1M |
| Max output | — | 128K |
| Input $ / M tokens | — | $4 |
| Output $ / M tokens | — | $20 |
| Results tracked | 17 | 35 |
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Category by category
Coding Claude Opus 5.5 leads
Amazon Nova Experimental Chat 10 20: 41.0 (#123), Claude Opus 5.5: 71.4 (#1)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Claude Opus 5.5 |
|---|---|---|
| LMArena Coding | 1413 | 1545 |
| FrontierCode | — | 54.4% |
| CursorBench | — | 57.8% |
| LMArena WebDev | — | 1820 |
| FrontierSWE | — | 62.3% |
| SciCode | — | 66.9% |
| MirrorCode | — | 77.4% |
Agentic & Tool Use Not comparable
Amazon Nova Experimental Chat 10 20: —, Claude Opus 5.5: 45.3 (#13)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Claude Opus 5.5 |
|---|---|---|
| APEX-Agents | — | 73.5% |
| GDP.pdf | — | 30.6% |
Reasoning Claude Opus 5.5 leads
Amazon Nova Experimental Chat 10 20: 27.3 (#110), Claude Opus 5.5: 79.5 (#2)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Claude Opus 5.5 |
|---|---|---|
| LMArena Hard Prompts | 1396 | 1545 |
| 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 leads
Amazon Nova Experimental Chat 10 20: 36.2 (#121), Claude Opus 5.5: 92.4 (#2)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Claude Opus 5.5 |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 91.2% |
| FrontierMath Tier 4 | — | 95% |
| OTIS Mock AIME 2024-2025 | — | 100% |
| ProofBench | — | 100% |
| LMArena Math | 1425 | — |
Knowledge Claude Opus 5.5 leads
Amazon Nova Experimental Chat 10 20: 37.8 (#142), Claude Opus 5.5: 66.6 (#9)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Claude Opus 5.5 |
|---|---|---|
| LMArena Expert | 1385 | 1564 |
| GPQA Diamond | — | 90.6% |
| SimpleQA Verified | — | 72.2% |
Multimodal Not comparable
Amazon Nova Experimental Chat 10 20: —, Claude Opus 5.5: 56.5 (#2)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Claude Opus 5.5 |
|---|---|---|
| Furniture Assembly | — | 83.3% |
Multilingual Claude Opus 5.5 leads
Amazon Nova Experimental Chat 10 20: 49.7 (#127), Claude Opus 5.5: 59.8 (#1)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Claude Opus 5.5 |
|---|---|---|
| LMArena Non-English | 1372 | 1513 |
| LMArena Chinese | 1405 | 1572 |
| LMArena Russian | 1371 | 1532 |
| LMArena French | 1426 | — |
| LMArena German | 1391 | — |
| LMArena Japanese | 1355 | — |
| LMArena Korean | 1327 | — |
| LMArena Spanish | 1381 | — |
Instruction Following Claude Opus 5.5 leads
Amazon Nova Experimental Chat 10 20: 72.3 (#136), Claude Opus 5.5: 80.1 (#2)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Claude Opus 5.5 |
|---|---|---|
| LMArena Instruction Following | 1365 | 1535 |
Long Context Claude Opus 5.5 leads
Amazon Nova Experimental Chat 10 20: 41.7 (#128), Claude Opus 5.5: 47.3 (#18)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Claude Opus 5.5 |
|---|---|---|
| LMArena Longer Query | 1370 | 1540 |
Writing & Preference Claude Opus 5.5 leads
Amazon Nova Experimental Chat 10 20: 56.9 (#131), Claude Opus 5.5: 78.7 (#3)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Claude Opus 5.5 |
|---|---|---|
| LMArena Text | 1394 | 1518 |
| LMArena Creative Writing | 1318 | 1538 |
| LMArena Multi-Turn | 1364 | 1520 |
| EQ-Bench Creative Writing | — | 2050 |
Frequently asked questions
Is Amazon Nova Experimental Chat 10 20 better than Claude Opus 5.5?
Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 41.5 on the Noometry Index.
Is Amazon Nova Experimental Chat 10 20 or Claude Opus 5.5 better for coding?
Claude Opus 5.5 scores higher on coding benchmarks: 71.4 versus 41.0 in the Noometry coding category.
How many benchmarks do Amazon Nova Experimental Chat 10 20 and Claude Opus 5.5 share?
11 benchmarks have published results for both models. Amazon Nova Experimental Chat 10 20 has 17 scored results on Noometry and Claude Opus 5.5 has 35.