Model comparison
Claude 3 Sonnet vs GPT-5.6 Luna
GPT-5.6 Luna is the stronger model overall, scoring 54.6 to 29.0 on the Noometry Index.
Last verified . 23 shared benchmarks.
Summary
- They share 23 benchmarks with published results for both. Claude 3 Sonnet scores higher in 0 categories and GPT-5.6 Luna in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.6 Luna leads 77.7 to 10.7.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 2.5% for Claude 3 Sonnet and 98.3% for GPT-5.6 Luna.
Side by side
| Claude 3 Sonnet | GPT-5.6 Luna | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 29.0 | 54.6 |
| Released | 2024-02-29 | 2026-07-09 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1.05M |
| Max output | — | 128K |
| Input $ / M tokens | — | $0.20 |
| Output $ / M tokens | — | $1.20 |
| Results tracked | 30 | 52 |
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Category by category
Coding GPT-5.6 Luna leads
Claude 3 Sonnet: 29.6 (#302), GPT-5.6 Luna: 54.5 (#28)
| Benchmark | Claude 3 Sonnet | GPT-5.6 Luna |
|---|---|---|
| WeirdML | 10.2% | 60.9% |
| LMArena Coding | 1223 | 1466 |
| DeepSWE | — | 67.2% |
| FrontierCode | — | 39.8% |
| CursorBench | — | 35.9% |
| LMArena WebDev | — | 1519 |
| SciCode | — | 53.6% |
| BigCodeBench Instruct | 42.7% | — |
| BigCodeBench Complete | 53.8% | — |
| ALE-Bench | — | 1,667 |
| HumanEval+ | 64% | — |
| MBPP+ | 69.3% | — |
Agentic & Tool Use Not comparable
Claude 3 Sonnet: —, GPT-5.6 Luna: 34.4 (#45)
| Benchmark | Claude 3 Sonnet | GPT-5.6 Luna |
|---|---|---|
| APEX-Agents | — | 43% |
| BALROG | — | 45.6% |
| GDP.pdf | — | 22.7% |
| Vending-Bench 2 | — | 4,095 |
Reasoning GPT-5.6 Luna leads
Claude 3 Sonnet: 20.5 (#237), GPT-5.6 Luna: 47.6 (#43)
| Benchmark | Claude 3 Sonnet | GPT-5.6 Luna |
|---|---|---|
| LMArena Hard Prompts | 1197 | 1451 |
| DTBench | 53.6% | 89.1% |
| Epoch Capabilities Index | 120.7 | 156.39 |
| ARC-AGI-2 | — | 59.5% |
| SimpleBench | — | 46.8% |
| Kagi LLM Benchmark | — | 49.1% |
| NYT Connections (extended) | — | 69.4% |
| ARC-AGI-1 | — | 88% |
| CritPt | — | 20.6% |
| Chess Puzzles | — | 40% |
| Mystery Game Puzzles | — | 21% |
| LMCA | — | 48.5% |
| Surface Evolver Bench | — | 61.9% |
| WinoGrande | 75.1% | — |
Math GPT-5.6 Luna leads
Claude 3 Sonnet: 10.7 (#310), GPT-5.6 Luna: 77.7 (#14)
| Benchmark | Claude 3 Sonnet | GPT-5.6 Luna |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 2.5% | 98.3% |
| LMArena Math | 1213 | 1458 |
| FrontierMath (Tiers 1-3) | — | 82.1% |
| FrontierMath Tier 4 | — | 61% |
| ProofBench | — | 60% |
| MATH Level 5 | 18.2% | — |
Knowledge GPT-5.6 Luna leads
Claude 3 Sonnet: 21.1 (#276), GPT-5.6 Luna: 58.5 (#34)
| Benchmark | Claude 3 Sonnet | GPT-5.6 Luna |
|---|---|---|
| GPQA Diamond | 40.6% | 91.6% |
| LMArena Expert | 1173 | 1478 |
| SimpleQA Verified | — | 41% |
| MMLU | 75.9% | — |
Multimodal GPT-5.6 Luna leads
Claude 3 Sonnet: 25.2 (#125), GPT-5.6 Luna: 42.7 (#28)
| Benchmark | Claude 3 Sonnet | GPT-5.6 Luna |
|---|---|---|
| LMArena Vision | 984 | 1258 |
| Blueprint-Bench 2 | — | 22.6% |
| Furniture Assembly | — | 42.5% |
| LMArena Document | — | 1457 |
Multilingual GPT-5.6 Luna leads
Claude 3 Sonnet: 37.8 (#234), GPT-5.6 Luna: 52.8 (#78)
| Benchmark | Claude 3 Sonnet | GPT-5.6 Luna |
|---|---|---|
| LMArena Non-English | 1205 | 1417 |
| LMArena Chinese | 1189 | 1470 |
| LMArena French | 1229 | 1456 |
| LMArena German | 1204 | 1454 |
| LMArena Japanese | 1131 | 1411 |
| LMArena Korean | 1128 | 1415 |
| LMArena Russian | 1227 | 1428 |
| LMArena Spanish | 1204 | 1448 |
Instruction Following GPT-5.6 Luna leads
Claude 3 Sonnet: 62.8 (#235), GPT-5.6 Luna: 75.6 (#57)
| Benchmark | Claude 3 Sonnet | GPT-5.6 Luna |
|---|---|---|
| LMArena Instruction Following | 1199 | 1437 |
Long Context GPT-5.6 Luna leads
Claude 3 Sonnet: 36.7 (#228), GPT-5.6 Luna: 43.9 (#82)
| Benchmark | Claude 3 Sonnet | GPT-5.6 Luna |
|---|---|---|
| LMArena Longer Query | 1211 | 1436 |
Writing & Preference GPT-5.6 Luna leads
Claude 3 Sonnet: 42.1 (#238), GPT-5.6 Luna: 68.0 (#29)
| Benchmark | Claude 3 Sonnet | GPT-5.6 Luna |
|---|---|---|
| LMArena Text | 1218 | 1431 |
| LMArena Creative Writing | 1186 | 1396 |
| LMArena Multi-Turn | 1227 | 1434 |
| EQ-Bench Creative Writing | — | 1829 |
| EQ-Bench 4 | — | 1156 |
Frequently asked questions
Is Claude 3 Sonnet better than GPT-5.6 Luna?
GPT-5.6 Luna is the stronger model overall, scoring 54.6 to 29.0 on the Noometry Index.
Is Claude 3 Sonnet or GPT-5.6 Luna better for coding?
GPT-5.6 Luna scores higher on coding benchmarks: 54.5 versus 29.6 in the Noometry coding category.
How many benchmarks do Claude 3 Sonnet and GPT-5.6 Luna share?
23 benchmarks have published results for both models. Claude 3 Sonnet has 30 scored results on Noometry and GPT-5.6 Luna has 52.