Model comparison
Claude 3.5 Sonnet vs Claude Sonnet 5.5
Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 34.4 on the Noometry Index.
Last verified . 2 shared benchmarks.
Summary
- They share 2 benchmarks with published results for both. Claude 3.5 Sonnet scores higher in 0 categories and Claude Sonnet 5.5 in 6 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Sonnet 5.5 leads 88.7 to 18.0.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 8.5% for Claude 3.5 Sonnet and 100% for Claude Sonnet 5.5.
Side by side
| Claude 3.5 Sonnet | Claude Sonnet 5.5 | |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Noometry Index | 34.4 | 60.5 |
| Released | 2024-06-20 | 2026-09-28 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1M |
| Max output | — | 128K |
| Input $ / M tokens | — | $2 |
| Output $ / M tokens | — | $10 |
| Results tracked | 60 | 16 |
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Category by category
Coding Claude Sonnet 5.5 leads
Claude 3.5 Sonnet: 39.5 (#145), Claude Sonnet 5.5: 65.5 (#6)
| Benchmark | Claude 3.5 Sonnet | Claude Sonnet 5.5 |
|---|---|---|
| FrontierCode | — | 52.1% |
| Aider Polyglot | 51.6% | — |
| CursorBench | — | 55.5% |
| LMArena WebDev | — | 1699 |
| FrontierSWE | — | 61.9% |
| SciCode | — | 61% |
| GSO | 4.6% | — |
| WeirdML | 40% | — |
| BigCodeBench Instruct | 46.8% | — |
| LiveBench Coding | 67.1% | — |
| LMArena Coding | 1343 | — |
| BigCodeBench Complete | 58.6% | — |
| CadEval | 48% | — |
| ALE-Bench | — | 1,819 |
| HumanEval+ | 81.7% | — |
| MBPP+ | 74.3% | — |
Agentic & Tool Use Claude Sonnet 5.5 leads
Claude 3.5 Sonnet: 32.1 (#61), Claude Sonnet 5.5: 44.9 (#14)
| Benchmark | Claude 3.5 Sonnet | Claude Sonnet 5.5 |
|---|---|---|
| APEX-Agents | — | 75.5% |
| TheAgentCompany | 24% | — |
| Cybench | 17.5% | — |
| BALROG | 32.6% | — |
| METR Time Horizons | 45.2% | — |
Reasoning Claude Sonnet 5.5 leads
Claude 3.5 Sonnet: 22.5 (#176), Claude Sonnet 5.5: 52.4 (#29)
| Benchmark | Claude 3.5 Sonnet | Claude Sonnet 5.5 |
|---|---|---|
| SimpleBench | 41.4% | — |
| CritPt | — | 31.4% |
| EnigmaEval | 0.9% | — |
| LiveBench Reasoning | 56.7% | — |
| LMArena Hard Prompts | 1305 | — |
| Mystery Game Puzzles | — | 65% |
| DTBench | 67.8% | — |
| LiveBench Data Analysis | 55% | — |
| Epoch Capabilities Index | 133.55 | — |
| ForecastBench | 60.7 | — |
| LiveBench | 59% | — |
Math Claude Sonnet 5.5 leads
Claude 3.5 Sonnet: 18.0 (#282), Claude Sonnet 5.5: 88.7 (#4)
| Benchmark | Claude 3.5 Sonnet | Claude Sonnet 5.5 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 8.5% | 100% |
| FrontierMath (Tiers 1-3) | — | 88.8% |
| FrontierMath Tier 4 | — | 80.5% |
| ProofBench | — | 100% |
| Omni-MATH | 27.6% | — |
| LiveBench Math | 52.3% | — |
| LMArena Math | 1306 | — |
| MATH Level 5 | 56.9% | — |
| FrontierMath (Feb 2025 set) | 2.1% | — |
| FrontierMath Tier 4 (v1) | 0% | — |
Knowledge Claude Sonnet 5.5 leads
Claude 3.5 Sonnet: 28.5 (#236), Claude Sonnet 5.5: 66.0 (#11)
| Benchmark | Claude 3.5 Sonnet | Claude Sonnet 5.5 |
|---|---|---|
| GPQA Diamond | 55.3% | 95.6% |
| Humanity's Last Exam | 4.1% | — |
| SimpleQA Verified | — | 46.5% |
| MMLU-Pro | 77.7% | — |
| Confabulations | 19.9% | — |
| GPQA (HELM) | 56.5% | — |
| LMArena Expert | 1264 | — |
| MMLU | 87.3% | — |
Multimodal Claude Sonnet 5.5 leads
Claude 3.5 Sonnet: 26.0 (#115), Claude Sonnet 5.5: 53.2 (#5)
| Benchmark | Claude 3.5 Sonnet | Claude Sonnet 5.5 |
|---|---|---|
| LMArena Vision | 1125 | — |
| Video-MME | 60% | — |
| GeoBench | 62% | — |
| VPCT | 33% | — |
| Furniture Assembly | — | 75% |
Multilingual Not comparable
Claude 3.5 Sonnet: 43.4 (#180), Claude Sonnet 5.5: —
| Benchmark | Claude 3.5 Sonnet | Claude Sonnet 5.5 |
|---|---|---|
| LMArena Non-English | 1283 | — |
| LMArena Chinese | 1271 | — |
| LMArena French | 1304 | — |
| LMArena German | 1297 | — |
| LMArena Japanese | 1234 | — |
| LMArena Korean | 1200 | — |
| LMArena Russian | 1305 | — |
| LMArena Spanish | 1289 | — |
Instruction Following Not comparable
Claude 3.5 Sonnet: 69.0 (#177), Claude Sonnet 5.5: —
| Benchmark | Claude 3.5 Sonnet | Claude Sonnet 5.5 |
|---|---|---|
| LiveBench Instruction Following | 69.3% | — |
| IFEval | 85.5% | — |
| LMArena Instruction Following | 1297 | — |
Long Context Not comparable
Claude 3.5 Sonnet: 39.9 (#162), Claude Sonnet 5.5: —
| Benchmark | Claude 3.5 Sonnet | Claude Sonnet 5.5 |
|---|---|---|
| LMArena Longer Query | 1311 | — |
Writing & Preference Not comparable
Claude 3.5 Sonnet: 53.0 (#159), Claude Sonnet 5.5: —
| Benchmark | Claude 3.5 Sonnet | Claude Sonnet 5.5 |
|---|---|---|
| LMArena Text | 1298 | — |
| LMArena Creative Writing | 1292 | — |
| Short-Story Creative Writing | 80.3% | — |
| EQ-Bench Creative Writing | 1451 | — |
| WildBench | 79.2% | — |
| LMArena Multi-Turn | 1326 | — |
| LiveBench Language | 53.8% | — |
Frequently asked questions
Is Claude 3.5 Sonnet better than Claude Sonnet 5.5?
Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 34.4 on the Noometry Index.
Is Claude 3.5 Sonnet or Claude Sonnet 5.5 better for coding?
Claude Sonnet 5.5 scores higher on coding benchmarks: 65.5 versus 39.5 in the Noometry coding category.
How many benchmarks do Claude 3.5 Sonnet and Claude Sonnet 5.5 share?
2 benchmarks have published results for both models. Claude 3.5 Sonnet has 60 scored results on Noometry and Claude Sonnet 5.5 has 16.