Model comparison
Claude 3.5 Sonnet vs GPT-5.5 Instant
GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 34.6 on the Noometry Index.
Last verified . 21 shared benchmarks.
Summary
- They share 21 benchmarks with published results for both. Claude 3.5 Sonnet scores higher in 0 categories and GPT-5.5 Instant in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where GPT-5.5 Instant leads 48.9 to 28.6.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 8.5% for Claude 3.5 Sonnet and 68.1% for GPT-5.5 Instant.
Side by side
| Claude 3.5 Sonnet | GPT-5.5 Instant | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 34.6 | 42.7 |
| Released | 2024-06-20 | 2026-05-05 |
| Weights | Proprietary | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 60 | 27 |
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Category by category
Coding GPT-5.5 Instant leads
Claude 3.5 Sonnet: 39.0 (#165), GPT-5.5 Instant: 44.3 (#74)
| Benchmark | Claude 3.5 Sonnet | GPT-5.5 Instant |
|---|---|---|
| LMArena Coding | 1342 | 1433 |
| Aider Polyglot | 51.6% | — |
| SciCode | — | 48.6% |
| GSO | 4.6% | — |
| WeirdML | 40% | — |
| BigCodeBench Instruct | 46.8% | — |
| LiveBench Coding | 67.1% | — |
| BigCodeBench Complete | 58.6% | — |
| CadEval | 48% | — |
| HumanEval+ | 81.7% | — |
| MBPP+ | 74.3% | — |
Agentic & Tool Use Not comparable
Claude 3.5 Sonnet: 32.3 (#67), GPT-5.5 Instant: —
| Benchmark | Claude 3.5 Sonnet | GPT-5.5 Instant |
|---|---|---|
| TheAgentCompany | 24% | — |
| Cybench | 17.5% | — |
| BALROG | 32.6% | — |
| METR Time Horizons | 45.2% | — |
Reasoning GPT-5.5 Instant leads
Claude 3.5 Sonnet: 23.1 (#183), GPT-5.5 Instant: 24.9 (#155)
| Benchmark | Claude 3.5 Sonnet | GPT-5.5 Instant |
|---|---|---|
| LMArena Hard Prompts | 1305 | 1426 |
| Epoch Capabilities Index | 133.55 | 142.52 |
| SimpleBench | 41.4% | — |
| CritPt | — | 0% |
| Chess Puzzles | — | 12% |
| EnigmaEval | 0.9% | — |
| LiveBench Reasoning | 56.7% | — |
| DTBench | 67.8% | — |
| LiveBench Data Analysis | 55% | — |
| ForecastBench | 60.7 | — |
| LiveBench | 59% | — |
Math GPT-5.5 Instant leads
Claude 3.5 Sonnet: 19.2 (#288), GPT-5.5 Instant: 26.5 (#259)
| Benchmark | Claude 3.5 Sonnet | GPT-5.5 Instant |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 8.5% | 68.1% |
| LMArena Math | 1307 | 1420 |
| FrontierMath (Tiers 1-3) | — | 26.3% |
| FrontierMath Tier 4 | — | 2.4% |
| Omni-MATH | 27.6% | — |
| LiveBench Math | 52.3% | — |
| MATH Level 5 | 56.9% | — |
| FrontierMath (Feb 2025 set) | 2.1% | — |
| FrontierMath Tier 4 (v1) | 0% | — |
Knowledge GPT-5.5 Instant leads
Claude 3.5 Sonnet: 28.6 (#245), GPT-5.5 Instant: 48.9 (#74)
| Benchmark | Claude 3.5 Sonnet | GPT-5.5 Instant |
|---|---|---|
| GPQA Diamond | 55.3% | 82.5% |
| LMArena Expert | 1265 | 1409 |
| Humanity's Last Exam | 4.1% | — |
| MMLU-Pro | 77.7% | — |
| Confabulations | 19.9% | — |
| GPQA (HELM) | 56.5% | — |
| MMLU | 87.3% | — |
Multimodal GPT-5.5 Instant leads
Claude 3.5 Sonnet: 26.5 (#120), GPT-5.5 Instant: 40.0 (#52)
| Benchmark | Claude 3.5 Sonnet | GPT-5.5 Instant |
|---|---|---|
| LMArena Vision | 1125 | 1250 |
| Video-MME | 60% | — |
| GeoBench | 62% | — |
| VPCT | 33% | — |
| LMArena Document | — | 1403 |
Multilingual GPT-5.5 Instant leads
Claude 3.5 Sonnet: 43.2 (#185), GPT-5.5 Instant: 52.8 (#80)
| Benchmark | Claude 3.5 Sonnet | GPT-5.5 Instant |
|---|---|---|
| LMArena Non-English | 1283 | 1417 |
| LMArena Chinese | 1272 | 1456 |
| LMArena French | 1305 | 1428 |
| LMArena German | 1297 | 1411 |
| LMArena Japanese | 1234 | 1408 |
| LMArena Korean | 1200 | 1392 |
| LMArena Russian | 1306 | 1431 |
| LMArena Spanish | 1290 | 1429 |
Instruction Following GPT-5.5 Instant leads
Claude 3.5 Sonnet: 68.8 (#182), GPT-5.5 Instant: 74.2 (#100)
| Benchmark | Claude 3.5 Sonnet | GPT-5.5 Instant |
|---|---|---|
| LMArena Instruction Following | 1297 | 1406 |
| LiveBench Instruction Following | 69.3% | — |
| IFEval | 85.5% | — |
Long Context GPT-5.5 Instant leads
Claude 3.5 Sonnet: 39.9 (#167), GPT-5.5 Instant: 43.4 (#96)
| Benchmark | Claude 3.5 Sonnet | GPT-5.5 Instant |
|---|---|---|
| LMArena Longer Query | 1311 | 1422 |
Writing & Preference GPT-5.5 Instant leads
Claude 3.5 Sonnet: 52.9 (#164), GPT-5.5 Instant: 61.8 (#85)
| Benchmark | Claude 3.5 Sonnet | GPT-5.5 Instant |
|---|---|---|
| LMArena Text | 1298 | 1419 |
| LMArena Creative Writing | 1292 | 1419 |
| LMArena Multi-Turn | 1326 | 1433 |
| Short-Story Creative Writing | 80.3% | — |
| EQ-Bench Creative Writing | 1451 | — |
| WildBench | 79.2% | — |
| LiveBench Language | 53.8% | — |
Frequently asked questions
Is Claude 3.5 Sonnet better than GPT-5.5 Instant?
GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 34.6 on the Noometry Index.
Is Claude 3.5 Sonnet or GPT-5.5 Instant better for coding?
GPT-5.5 Instant scores higher on coding benchmarks: 44.3 versus 39.0 in the Noometry coding category.
How many benchmarks do Claude 3.5 Sonnet and GPT-5.5 Instant share?
21 benchmarks have published results for both models. Claude 3.5 Sonnet has 60 scored results on Noometry and GPT-5.5 Instant has 27.