Model comparison
GPT-5.6 Luna vs Grok 4.1
GPT-5.6 Luna is the stronger model overall, scoring 54.6 to 41.5 on the Noometry Index.
Last verified . 18 shared benchmarks.
Summary
- They share 18 benchmarks with published results for both. GPT-5.6 Luna scores higher in 8 categories and Grok 4.1 in 1 category; 6 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.6 Luna leads 77.7 to 38.9.
Side by side
| GPT-5.6 Luna | Grok 4.1 | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 54.6 | 41.5 |
| Released | 2026-07-09 | 2025-11-17 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | — |
| Max output | 128K | — |
| Input $ / M tokens | $0.20 | — |
| Output $ / M tokens | $1.20 | — |
| Results tracked | 52 | 19 |
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Category by category
Coding GPT-5.6 Luna leads
GPT-5.6 Luna: 54.5 (#28), Grok 4.1: 33.7 (#253)
| Benchmark | GPT-5.6 Luna | Grok 4.1 |
|---|---|---|
| LMArena WebDev | 1519 | 1214 |
| LMArena Coding | 1466 | 1445 |
| DeepSWE | 67.2% | — |
| FrontierCode | 39.8% | — |
| CursorBench | 35.9% | — |
| SciCode | 53.6% | — |
| WeirdML | 60.9% | — |
| ALE-Bench | 1,667 | — |
Agentic & Tool Use Too close to call
GPT-5.6 Luna: 34.4 (#45), Grok 4.1: 34.1 (#49)
| Benchmark | GPT-5.6 Luna | Grok 4.1 |
|---|---|---|
| APEX-Agents | 43% | — |
| Cybench | — | 39% |
| BALROG | 45.6% | — |
| GDP.pdf | 22.7% | — |
| Vending-Bench 2 | 4,095 | — |
Reasoning GPT-5.6 Luna leads
GPT-5.6 Luna: 47.6 (#43), Grok 4.1: 29.5 (#91)
| Benchmark | GPT-5.6 Luna | Grok 4.1 |
|---|---|---|
| LMArena Hard Prompts | 1451 | 1435 |
| 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% | — |
| DTBench | 89.1% | — |
| LMCA | 48.5% | — |
| Surface Evolver Bench | 61.9% | — |
| Epoch Capabilities Index | 156.39 | — |
Math GPT-5.6 Luna leads
GPT-5.6 Luna: 77.7 (#14), Grok 4.1: 38.9 (#120)
| Benchmark | GPT-5.6 Luna | Grok 4.1 |
|---|---|---|
| LMArena Math | 1458 | 1422 |
| FrontierMath (Tiers 1-3) | 82.1% | — |
| FrontierMath Tier 4 | 61% | — |
| OTIS Mock AIME 2024-2025 | 98.3% | — |
| ProofBench | 60% | — |
Knowledge GPT-5.6 Luna leads
GPT-5.6 Luna: 58.5 (#34), Grok 4.1: 39.5 (#133)
| Benchmark | GPT-5.6 Luna | Grok 4.1 |
|---|---|---|
| LMArena Expert | 1478 | 1417 |
| GPQA Diamond | 91.6% | — |
| SimpleQA Verified | 41% | — |
Multimodal Not comparable
GPT-5.6 Luna: 42.7 (#28), Grok 4.1: —
| Benchmark | GPT-5.6 Luna | Grok 4.1 |
|---|---|---|
| LMArena Vision | 1258 | — |
| Blueprint-Bench 2 | 22.6% | — |
| Furniture Assembly | 42.5% | — |
| LMArena Document | 1457 | — |
Multilingual Too close to call
GPT-5.6 Luna: 52.8 (#78), Grok 4.1: 53.4 (#68)
| Benchmark | GPT-5.6 Luna | Grok 4.1 |
|---|---|---|
| LMArena Non-English | 1417 | 1425 |
| LMArena Chinese | 1470 | 1465 |
| LMArena French | 1456 | 1448 |
| LMArena German | 1454 | 1446 |
| LMArena Japanese | 1411 | 1397 |
| LMArena Korean | 1415 | 1407 |
| LMArena Russian | 1428 | 1434 |
| LMArena Spanish | 1448 | 1438 |
Instruction Following GPT-5.6 Luna leads
GPT-5.6 Luna: 75.6 (#57), Grok 4.1: 73.8 (#111)
| Benchmark | GPT-5.6 Luna | Grok 4.1 |
|---|---|---|
| LMArena Instruction Following | 1437 | 1400 |
Long Context Too close to call
GPT-5.6 Luna: 43.9 (#82), Grok 4.1: 43.2 (#100)
| Benchmark | GPT-5.6 Luna | Grok 4.1 |
|---|---|---|
| LMArena Longer Query | 1436 | 1416 |
Writing & Preference GPT-5.6 Luna leads
GPT-5.6 Luna: 68.0 (#29), Grok 4.1: 62.4 (#75)
| Benchmark | GPT-5.6 Luna | Grok 4.1 |
|---|---|---|
| LMArena Text | 1431 | 1437 |
| LMArena Creative Writing | 1396 | 1411 |
| LMArena Multi-Turn | 1434 | 1437 |
| EQ-Bench Creative Writing | 1829 | — |
| EQ-Bench 4 | 1156 | — |
Frequently asked questions
Is GPT-5.6 Luna better than Grok 4.1?
GPT-5.6 Luna is the stronger model overall, scoring 54.6 to 41.5 on the Noometry Index.
Is GPT-5.6 Luna or Grok 4.1 better for coding?
GPT-5.6 Luna scores higher on coding benchmarks: 54.5 versus 33.7 in the Noometry coding category.
How many benchmarks do GPT-5.6 Luna and Grok 4.1 share?
18 benchmarks have published results for both models. GPT-5.6 Luna has 52 scored results on Noometry and Grok 4.1 has 19.