Model comparison
Claude 2.1 vs GPT-5.6 Luna
GPT-5.6 Luna is the stronger model overall, scoring 54.7 to 24.9 on the Noometry Index.
Last verified . 5 shared benchmarks.
Summary
- They share 5 benchmarks with published results for both. Claude 2.1 scores higher in 0 categories and GPT-5.6 Luna in 4 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.6 Luna leads 77.5 to 9.6.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 1.9% for Claude 2.1 and 98.3% for GPT-5.6 Luna.
Side by side
| Claude 2.1 | GPT-5.6 Luna | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 24.9 | 54.7 |
| Released | 2023-11-21 | 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 | 7 | 51 |
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Category by category
Coding GPT-5.6 Luna leads
Claude 2.1: 25.8 (#322), GPT-5.6 Luna: 53.9 (#25)
| Benchmark | Claude 2.1 | GPT-5.6 Luna |
|---|---|---|
| WeirdML | 7.1% | 60.9% |
| DeepSWE | — | 67.2% |
| FrontierCode | — | 39.8% |
| CursorBench | — | 35.9% |
| LMArena WebDev | — | 1517 |
| SciCode | — | 53.6% |
| LMArena Coding | — | 1466 |
| ALE-Bench | — | 1,667 |
Agentic & Tool Use Not comparable
Claude 2.1: —, GPT-5.6 Luna: 35.3 (#37)
| Benchmark | Claude 2.1 | GPT-5.6 Luna |
|---|---|---|
| BALROG | — | 45.6% |
| GDP.pdf | — | 22.7% |
| Vending-Bench 2 | — | 4,095 |
Reasoning GPT-5.6 Luna leads
Claude 2.1: 20.6 (#216), GPT-5.6 Luna: 47.5 (#38)
| Benchmark | Claude 2.1 | GPT-5.6 Luna |
|---|---|---|
| DTBench | 51% | 89.1% |
| Epoch Capabilities Index | 119.22 | 156.32 |
| 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% |
| LMArena Hard Prompts | — | 1452 |
| Mystery Game Puzzles | — | 21% |
| LMCA | — | 48.5% |
| Surface Evolver Bench | — | 61.9% |
| ForecastBench | 54.2 | — |
Math GPT-5.6 Luna leads
Claude 2.1: 9.6 (#309), GPT-5.6 Luna: 77.5 (#12)
| Benchmark | Claude 2.1 | GPT-5.6 Luna |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 1.9% | 98.3% |
| FrontierMath (Tiers 1-3) | — | 82.1% |
| FrontierMath Tier 4 | — | 61% |
| ProofBench | — | 60% |
| LMArena Math | — | 1455 |
Knowledge GPT-5.6 Luna leads
Claude 2.1: 15.5 (#287), GPT-5.6 Luna: 58.6 (#31)
| Benchmark | Claude 2.1 | GPT-5.6 Luna |
|---|---|---|
| GPQA Diamond | 33% | 91.6% |
| SimpleQA Verified | — | 41% |
| LMArena Expert | — | 1479 |
| MMLU | 73.5% | — |
Multimodal Not comparable
Claude 2.1: —, GPT-5.6 Luna: 43.0 (#22)
| Benchmark | Claude 2.1 | GPT-5.6 Luna |
|---|---|---|
| LMArena Vision | — | 1259 |
| Blueprint-Bench 2 | — | 22.6% |
| Furniture Assembly | — | 42.5% |
| LMArena Document | — | 1457 |
Multilingual Not comparable
Claude 2.1: —, GPT-5.6 Luna: 53.0 (#73)
| Benchmark | Claude 2.1 | GPT-5.6 Luna |
|---|---|---|
| LMArena Non-English | — | 1418 |
| LMArena Chinese | — | 1469 |
| LMArena French | — | 1457 |
| LMArena German | — | 1459 |
| LMArena Japanese | — | 1416 |
| LMArena Korean | — | 1414 |
| LMArena Russian | — | 1428 |
| LMArena Spanish | — | 1445 |
Instruction Following Not comparable
Claude 2.1: —, GPT-5.6 Luna: 76.0 (#48)
| Benchmark | Claude 2.1 | GPT-5.6 Luna |
|---|---|---|
| LMArena Instruction Following | — | 1440 |
Long Context Not comparable
Claude 2.1: —, GPT-5.6 Luna: 43.9 (#78)
| Benchmark | Claude 2.1 | GPT-5.6 Luna |
|---|---|---|
| LMArena Longer Query | — | 1437 |
Writing & Preference Not comparable
Claude 2.1: —, GPT-5.6 Luna: 68.3 (#27)
| Benchmark | Claude 2.1 | GPT-5.6 Luna |
|---|---|---|
| LMArena Text | — | 1432 |
| LMArena Creative Writing | — | 1397 |
| EQ-Bench Creative Writing | — | 1829 |
| EQ-Bench 4 | — | 1156 |
| LMArena Multi-Turn | — | 1433 |
Frequently asked questions
Is Claude 2.1 better than GPT-5.6 Luna?
GPT-5.6 Luna is the stronger model overall, scoring 54.7 to 24.9 on the Noometry Index.
Is Claude 2.1 or GPT-5.6 Luna better for coding?
GPT-5.6 Luna scores higher on coding benchmarks: 53.9 versus 25.8 in the Noometry coding category.
How many benchmarks do Claude 2.1 and GPT-5.6 Luna share?
5 benchmarks have published results for both models. Claude 2.1 has 7 scored results on Noometry and GPT-5.6 Luna has 51.