Model comparison
GPT-5.6 Sol vs Muse Spark
GPT-5.6 Sol is the stronger model overall, scoring 64.4 to 50.3 on the Noometry Index.
Last verified . 24 shared benchmarks.
MetaSummary
- They share 24 benchmarks with published results for both. GPT-5.6 Sol scores higher in 7 categories and Muse Spark in 2 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.6 Sol leads 74.7 to 34.9.
- The biggest single-benchmark swing is ProofBench: 83% for GPT-5.6 Sol and 17% for Muse Spark.
Side by side
| GPT-5.6 Sol | Muse Spark | |
|---|---|---|
| Provider | OpenAI | Meta |
| Noometry Index | 64.4 | 50.3 |
| Released | 2026-07-09 | 2026-04-08 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | — |
| Max output | 128K | — |
| Input $ / M tokens | $4 | — |
| Output $ / M tokens | $20 | — |
| Results tracked | 64 | 27 |
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Category by category
Coding GPT-5.6 Sol leads
GPT-5.6 Sol: 61.1 (#7), Muse Spark: 45.6 (#65)
| Benchmark | GPT-5.6 Sol | Muse Spark |
|---|---|---|
| SciCode | 57.1% | 51.5% |
| LMArena Coding | 1493 | 1482 |
| DeepSWE | 72.7% | — |
| FrontierCode | 47.5% | — |
| CursorBench | 41.7% | — |
| LMArena WebDev | 1619 | — |
| FrontierSWE | 32.2% | — |
| WeirdML | 89.4% | — |
| MirrorCode | 20% | — |
| ALE-Bench | 2,177 | — |
Agentic & Tool Use Not comparable
GPT-5.6 Sol: 50.2 (#7), Muse Spark: —
| Benchmark | GPT-5.6 Sol | Muse Spark |
|---|---|---|
| APEX-Agents | 51.4% | — |
| OSWorld 2.0 | 27.3% | — |
| τ²-bench Banking | 46.9% | — |
| PostTrainBench | 36.2% | — |
| BALROG | 60% | — |
| GBAEval | 52.6% | — |
| GDP.pdf | 30.7% | — |
| LMArena Search | 1257 | — |
| Vending-Bench 2 | 9,619 | — |
Reasoning GPT-5.6 Sol leads
GPT-5.6 Sol: 74.7 (#6), Muse Spark: 34.9 (#61)
| Benchmark | GPT-5.6 Sol | Muse Spark |
|---|---|---|
| CritPt | 32.3% | 11.3% |
| LMArena Hard Prompts | 1481 | 1475 |
| Epoch Capabilities Index | 161.99 | 152.09 |
| ARC-AGI-2 | 92.5% | — |
| SimpleBench | 71.7% | — |
| Kagi LLM Benchmark | 67% | — |
| NYT Connections (extended) | 93.8% | — |
| ARC-AGI-1 | 97.5% | — |
| Chess Puzzles | 64% | — |
| EnigmaEval | 37.1% | — |
| EBR-Bench | 44.8% | — |
| Mystery Game Puzzles | 58% | — |
| DTBench | 96% | — |
| LMCA | 59.2% | — |
| Surface Evolver Bench | 93.1% | — |
| Bench to the Future 3 | 0.14 | — |
Math GPT-5.6 Sol leads
GPT-5.6 Sol: 85.5 (#7), Muse Spark: 46.8 (#57)
| Benchmark | GPT-5.6 Sol | Muse Spark |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 88.9% |
| ProofBench | 83% | 17% |
| LMArena Math | 1472 | 1455 |
| FrontierMath (Tiers 1-3) | 89.1% | — |
| FrontierMath Tier 4 | 82.9% | — |
| FrontierMath (Feb 2025 set) | — | 39% |
| FrontierMath Erdős | 0% | — |
| FrontierMath Tier 4 (v1) | — | 14.6% |
Knowledge Muse Spark leads
GPT-5.6 Sol: 64.3 (#16), Muse Spark: 65.7 (#12)
| Benchmark | GPT-5.6 Sol | Muse Spark |
|---|---|---|
| GPQA Diamond | 93.5% | 89.8% |
| LMArena Expert | 1517 | 1458 |
| Humanity's Last Exam | — | 40.6% |
| SimpleQA Verified | 69.7% | — |
| Vectara Hallucination Rate | 12.4% | — |
Multimodal GPT-5.6 Sol leads
GPT-5.6 Sol: 48.9 (#8), Muse Spark: 42.7 (#23)
| Benchmark | GPT-5.6 Sol | Muse Spark |
|---|---|---|
| LMArena Vision | 1281 | 1306 |
| LMArena Document | 1483 | 1444 |
| Blueprint-Bench 2 | 33.6% | — |
| Furniture Assembly | 56.7% | — |
Multilingual Too close to call
GPT-5.6 Sol: 55.4 (#32), Muse Spark: 56.3 (#23)
| Benchmark | GPT-5.6 Sol | Muse Spark |
|---|---|---|
| LMArena Non-English | 1450 | 1464 |
| LMArena Chinese | 1523 | 1507 |
| LMArena French | 1475 | 1497 |
| LMArena German | 1476 | 1497 |
| LMArena Korean | 1434 | 1457 |
| LMArena Russian | 1466 | 1467 |
| LMArena Spanish | 1449 | 1471 |
| LMArena Japanese | 1475 | — |
Instruction Following GPT-5.6 Sol leads
GPT-5.6 Sol: 77.8 (#16), Muse Spark: 76.1 (#47)
| Benchmark | GPT-5.6 Sol | Muse Spark |
|---|---|---|
| LMArena Instruction Following | 1480 | 1443 |
Long Context Too close to call
GPT-5.6 Sol: 45.3 (#42), Muse Spark: 44.4 (#65)
| Benchmark | GPT-5.6 Sol | Muse Spark |
|---|---|---|
| LMArena Longer Query | 1479 | 1451 |
Writing & Preference GPT-5.6 Sol leads
GPT-5.6 Sol: 73.5 (#12), Muse Spark: 66.2 (#37)
| Benchmark | GPT-5.6 Sol | Muse Spark |
|---|---|---|
| LMArena Text | 1456 | 1474 |
| LMArena Creative Writing | 1450 | 1460 |
| LMArena Multi-Turn | 1456 | 1477 |
| EQ-Bench Creative Writing | 1972 | — |
| EQ-Bench 4 | 1250 | — |
Frequently asked questions
Is GPT-5.6 Sol better than Muse Spark?
GPT-5.6 Sol is the stronger model overall, scoring 64.4 to 50.3 on the Noometry Index.
Is GPT-5.6 Sol or Muse Spark better for coding?
GPT-5.6 Sol scores higher on coding benchmarks: 61.1 versus 45.6 in the Noometry coding category.
How many benchmarks do GPT-5.6 Sol and Muse Spark share?
24 benchmarks have published results for both models. GPT-5.6 Sol has 64 scored results on Noometry and Muse Spark has 27.