Model comparison
GPT-5.6 Luna vs Grok-2 (Dec 2024)
GPT-5.6 Luna is the stronger model overall, scoring 54.6 to 33.7 on the Noometry Index.
Last verified . 23 shared benchmarks.
Summary
- They share 23 benchmarks with published results for both. GPT-5.6 Luna scores higher in 8 categories and Grok-2 (Dec 2024) in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.6 Luna leads 77.7 to 20.8.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 98.3% for GPT-5.6 Luna and 11.5% for Grok-2 (Dec 2024).
Side by side
| GPT-5.6 Luna | Grok-2 (Dec 2024) | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 54.6 | 33.7 |
| Released | 2026-07-09 | 2024-08-13 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | — |
| Max output | 128K | — |
| Input $ / M tokens | $0.20 | — |
| Output $ / M tokens | $1.20 | — |
| Results tracked | 52 | 34 |
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Category by category
Coding GPT-5.6 Luna leads
GPT-5.6 Luna: 54.5 (#28), Grok-2 (Dec 2024): 33.3 (#258)
| Benchmark | GPT-5.6 Luna | Grok-2 (Dec 2024) |
|---|---|---|
| WeirdML | 60.9% | 22.2% |
| LMArena Coding | 1466 | 1287 |
| DeepSWE | 67.2% | — |
| FrontierCode | 39.8% | — |
| CursorBench | 35.9% | — |
| LMArena WebDev | 1519 | — |
| SciCode | 53.6% | — |
| LiveBench Coding | — | 46.4% |
| ALE-Bench | 1,667 | — |
Agentic & Tool Use Not comparable
GPT-5.6 Luna: 34.4 (#45), Grok-2 (Dec 2024): —
| Benchmark | GPT-5.6 Luna | Grok-2 (Dec 2024) |
|---|---|---|
| APEX-Agents | 43% | — |
| 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-2 (Dec 2024): 16.9 (#299)
| Benchmark | GPT-5.6 Luna | Grok-2 (Dec 2024) |
|---|---|---|
| SimpleBench | 46.8% | 22.7% |
| LMArena Hard Prompts | 1451 | 1272 |
| DTBench | 89.1% | 65.2% |
| Epoch Capabilities Index | 156.39 | 130.48 |
| ARC-AGI-2 | 59.5% | — |
| Kagi LLM Benchmark | 49.1% | — |
| NYT Connections (extended) | 69.4% | — |
| ARC-AGI-1 | 88% | — |
| CritPt | 20.6% | — |
| Chess Puzzles | 40% | — |
| LiveBench Reasoning | — | 54.8% |
| Mystery Game Puzzles | 21% | — |
| LiveBench Data Analysis | — | 54.5% |
| LMCA | 48.5% | — |
| Surface Evolver Bench | 61.9% | — |
| LiveBench | — | 54.3% |
Math GPT-5.6 Luna leads
GPT-5.6 Luna: 77.7 (#14), Grok-2 (Dec 2024): 20.8 (#284)
| Benchmark | GPT-5.6 Luna | Grok-2 (Dec 2024) |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 98.3% | 11.5% |
| LMArena Math | 1458 | 1283 |
| FrontierMath (Tiers 1-3) | 82.1% | — |
| FrontierMath Tier 4 | 61% | — |
| ProofBench | 60% | — |
| LiveBench Math | — | 54.9% |
| MATH Level 5 | — | 63.5% |
| FrontierMath (Feb 2025 set) | — | 0.7% |
Knowledge GPT-5.6 Luna leads
GPT-5.6 Luna: 58.5 (#34), Grok-2 (Dec 2024): 29.8 (#233)
| Benchmark | GPT-5.6 Luna | Grok-2 (Dec 2024) |
|---|---|---|
| GPQA Diamond | 91.6% | 53.8% |
| LMArena Expert | 1478 | 1254 |
| SimpleQA Verified | 41% | — |
| Confabulations | — | 20.1% |
Multimodal Not comparable
GPT-5.6 Luna: 42.7 (#28), Grok-2 (Dec 2024): —
| Benchmark | GPT-5.6 Luna | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Vision | 1258 | — |
| Blueprint-Bench 2 | 22.6% | — |
| Furniture Assembly | 42.5% | — |
| LMArena Document | 1457 | — |
Multilingual GPT-5.6 Luna leads
GPT-5.6 Luna: 52.8 (#78), Grok-2 (Dec 2024): 43.1 (#188)
| Benchmark | GPT-5.6 Luna | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Non-English | 1417 | 1282 |
| LMArena Chinese | 1470 | 1289 |
| LMArena French | 1456 | 1318 |
| LMArena German | 1454 | 1287 |
| LMArena Japanese | 1411 | 1244 |
| LMArena Korean | 1415 | 1237 |
| LMArena Russian | 1428 | 1286 |
| LMArena Spanish | 1448 | 1281 |
Instruction Following GPT-5.6 Luna leads
GPT-5.6 Luna: 75.6 (#57), Grok-2 (Dec 2024): 66.9 (#202)
| Benchmark | GPT-5.6 Luna | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Instruction Following | 1437 | 1270 |
| LiveBench Instruction Following | — | 69.6% |
Long Context GPT-5.6 Luna leads
GPT-5.6 Luna: 43.9 (#82), Grok-2 (Dec 2024): 38.8 (#190)
| Benchmark | GPT-5.6 Luna | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Longer Query | 1436 | 1276 |
Writing & Preference GPT-5.6 Luna leads
GPT-5.6 Luna: 68.0 (#29), Grok-2 (Dec 2024): 48.6 (#198)
| Benchmark | GPT-5.6 Luna | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Text | 1431 | 1305 |
| LMArena Creative Writing | 1396 | 1284 |
| LMArena Multi-Turn | 1434 | 1290 |
| Short-Story Creative Writing | — | 63.6% |
| EQ-Bench Creative Writing | 1829 | — |
| EQ-Bench 4 | 1156 | — |
| LiveBench Language | — | 45.6% |
Frequently asked questions
Is GPT-5.6 Luna better than Grok-2 (Dec 2024)?
GPT-5.6 Luna is the stronger model overall, scoring 54.6 to 33.7 on the Noometry Index.
Is GPT-5.6 Luna or Grok-2 (Dec 2024) better for coding?
GPT-5.6 Luna scores higher on coding benchmarks: 54.5 versus 33.3 in the Noometry coding category.
How many benchmarks do GPT-5.6 Luna and Grok-2 (Dec 2024) share?
23 benchmarks have published results for both models. GPT-5.6 Luna has 52 scored results on Noometry and Grok-2 (Dec 2024) has 34.