Model comparison
Amazon Nova Experimental Chat 10 20 vs Claude Sonnet 4.5
Claude Sonnet 4.5 is the stronger model overall, scoring 44.0 to 41.5 on the Noometry Index.
Last verified . 17 shared benchmarks.
Summary
- They share 17 benchmarks with published results for both. Amazon Nova Experimental Chat 10 20 scores higher in 2 categories and Claude Sonnet 4.5 in 6 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Claude Sonnet 4.5 leads 48.4 to 37.8.
Side by side
| Amazon Nova Experimental Chat 10 20 | Claude Sonnet 4.5 | |
|---|---|---|
| Provider | Amazon | Anthropic |
| Noometry Index | 41.5 | 44.0 |
| Released | — | 2025-09-29 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1M |
| Max output | — | 64K |
| Input $ / M tokens | — | $3 |
| Output $ / M tokens | — | $15 |
| Results tracked | 17 | 73 |
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Category by category
Coding Claude Sonnet 4.5 leads
Amazon Nova Experimental Chat 10 20: 41.0 (#123), Claude Sonnet 4.5: 47.8 (#54)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Claude Sonnet 4.5 |
|---|---|---|
| LMArena Coding | 1413 | 1489 |
| SWE-bench Verified | — | 71.3% |
| SWE-bench Verified (bash only) | — | 71.4% |
| LMArena WebDev | — | 1393 |
| SWE-bench Multilingual | — | 67% |
| SciCode | — | 44.7% |
| GSO | — | 14.7% |
| WeirdML | — | 47.7% |
| ALE-Bench | — | 796.15 |
| AlgoTune | — | 1.52 |
Agentic & Tool Use Not comparable
Amazon Nova Experimental Chat 10 20: —, Claude Sonnet 4.5: 38.1 (#30)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Claude Sonnet 4.5 |
|---|---|---|
| Terminal-Bench | — | 46.5% |
| Berkeley Function Calling Leaderboard | — | 73.2% |
| GDPval | — | 42.5% |
| Remote Labor Index | — | 2.1% |
| τ²-bench Airline | — | 72% |
| τ²-bench Banking | — | 25.3% |
| τ²-bench Retail | — | 72.4% |
| τ²-bench Telecom | — | 84.9% |
| Cybench | — | 60% |
| DeepResearch Bench | — | 52.6% |
| OSWorld | — | 62.9% |
| LMArena Search | — | 1159 |
| METR Time Horizons | — | 67.4% |
| Vending-Bench 2 | — | 3,839 |
Reasoning Too close to call
Amazon Nova Experimental Chat 10 20: 27.3 (#110), Claude Sonnet 4.5: 26.9 (#113)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Claude Sonnet 4.5 |
|---|---|---|
| LMArena Hard Prompts | 1396 | 1462 |
| ARC-AGI-2 | — | 13.6% |
| SimpleBench | — | 54.3% |
| Kagi LLM Benchmark | — | 57.9% |
| NYT Connections (extended) | — | 37.3% |
| ARC-AGI-1 | — | 63.7% |
| CritPt | — | 1.1% |
| Chess Puzzles | — | 12% |
| EnigmaEval | — | 6% |
| EBR-Bench | — | 2.4% |
| Mystery Game Puzzles | — | 17% |
| DTBench | — | 83.2% |
| LMCA | — | 38.8% |
| Epoch Capabilities Index | — | 146.84 |
| ForecastBench | — | 61.9 |
Math Amazon Nova Experimental Chat 10 20 leads
Amazon Nova Experimental Chat 10 20: 36.2 (#121), Claude Sonnet 4.5: 31.9 (#190)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Claude Sonnet 4.5 |
|---|---|---|
| LMArena Math | 1425 | 1448 |
| FrontierMath (Tiers 1-3) | — | 23.9% |
| FrontierMath Tier 4 | — | 2.4% |
| OTIS Mock AIME 2024-2025 | — | 77.8% |
| ProofBench | — | 19% |
| Omni-MATH | — | 55.3% |
| MATH Level 5 | — | 97.7% |
| FrontierMath (Feb 2025 set) | — | 15.2% |
| FrontierMath Tier 4 (v1) | — | 4.2% |
Knowledge Claude Sonnet 4.5 leads
Amazon Nova Experimental Chat 10 20: 37.8 (#142), Claude Sonnet 4.5: 48.4 (#70)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Claude Sonnet 4.5 |
|---|---|---|
| LMArena Expert | 1385 | 1483 |
| GPQA Diamond | — | 82.3% |
| Humanity's Last Exam | — | 13.7% |
| SimpleQA Verified | — | 30.7% |
| MMLU-Pro | — | 86.9% |
| Vectara Hallucination Rate | — | 12% |
| GPQA (HELM) | — | 68.6% |
Multimodal Not comparable
Amazon Nova Experimental Chat 10 20: —, Claude Sonnet 4.5: 34.1 (#84)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Claude Sonnet 4.5 |
|---|---|---|
| VPCT | — | 39.8% |
| LMArena Document | — | 1450 |
Multilingual Claude Sonnet 4.5 leads
Amazon Nova Experimental Chat 10 20: 49.7 (#127), Claude Sonnet 4.5: 53.6 (#65)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Claude Sonnet 4.5 |
|---|---|---|
| LMArena Non-English | 1372 | 1425 |
| LMArena Chinese | 1405 | 1459 |
| LMArena French | 1426 | 1459 |
| LMArena German | 1391 | 1427 |
| LMArena Japanese | 1355 | 1390 |
| LMArena Korean | 1327 | 1403 |
| LMArena Russian | 1371 | 1436 |
| LMArena Spanish | 1381 | 1457 |
Instruction Following Claude Sonnet 4.5 leads
Amazon Nova Experimental Chat 10 20: 72.3 (#136), Claude Sonnet 4.5: 75.2 (#74)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Claude Sonnet 4.5 |
|---|---|---|
| LMArena Instruction Following | 1365 | 1459 |
| IFEval | — | 85% |
Long Context Claude Sonnet 4.5 leads
Amazon Nova Experimental Chat 10 20: 41.7 (#128), Claude Sonnet 4.5: 45.2 (#45)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Claude Sonnet 4.5 |
|---|---|---|
| LMArena Longer Query | 1370 | 1476 |
Writing & Preference Claude Sonnet 4.5 leads
Amazon Nova Experimental Chat 10 20: 56.9 (#131), Claude Sonnet 4.5: 66.7 (#33)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Claude Sonnet 4.5 |
|---|---|---|
| LMArena Text | 1394 | 1439 |
| LMArena Creative Writing | 1318 | 1442 |
| LMArena Multi-Turn | 1364 | 1465 |
| EQ-Bench Creative Writing | — | 1678 |
| WildBench | — | 85.4% |
Frequently asked questions
Is Amazon Nova Experimental Chat 10 20 better than Claude Sonnet 4.5?
Claude Sonnet 4.5 is the stronger model overall, scoring 44.0 to 41.5 on the Noometry Index.
Is Amazon Nova Experimental Chat 10 20 or Claude Sonnet 4.5 better for coding?
Claude Sonnet 4.5 scores higher on coding benchmarks: 47.8 versus 41.0 in the Noometry coding category.
How many benchmarks do Amazon Nova Experimental Chat 10 20 and Claude Sonnet 4.5 share?
17 benchmarks have published results for both models. Amazon Nova Experimental Chat 10 20 has 17 scored results on Noometry and Claude Sonnet 4.5 has 73.