Model comparison
GPT-5.1 vs Muse Spark
Muse Spark is the stronger model overall, scoring 50.6 to 49.0 on the Noometry Index.
Last verified . 26 shared benchmarks.
MetaSummary
- They share 26 benchmarks with published results for both. GPT-5.1 scores higher in 6 categories and Muse Spark in 3 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Muse Spark leads 65.7 to 50.6.
- The biggest single-benchmark swing is Humanity's Last Exam: 23.7% for GPT-5.1 and 40.6% for Muse Spark.
Side by side
| GPT-5.1 | Muse Spark | |
|---|---|---|
| Provider | OpenAI | Meta |
| Noometry Index | 49.0 | 50.6 |
| Released | 2025-11-13 | 2026-04-08 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | — |
| Max output | 128K | — |
| Input $ / M tokens | $1.25 | — |
| Output $ / M tokens | $10 | — |
| Results tracked | 63 | 27 |
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Category by category
Coding Too close to call
GPT-5.1: 46.4 (#66), Muse Spark: 46.2 (#69)
| Benchmark | GPT-5.1 | Muse Spark |
|---|---|---|
| SciCode | 43.3% | 51.5% |
| LMArena Coding | 1454 | 1481 |
| SWE-bench Verified | 68% | — |
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1395 | — |
| GSO | 13.7% | — |
| WeirdML | 60.8% | — |
| LiveBench Coding | 72.5% | — |
| ALE-Bench | 1,192 | — |
Agentic & Tool Use Not comparable
GPT-5.1: 32.7 (#60), Muse Spark: —
| Benchmark | GPT-5.1 | Muse Spark |
|---|---|---|
| Terminal-Bench | 47.6% | — |
| DeepResearch Bench | 42.8% | — |
| LMArena Search | 1199 | — |
| Vending-Bench 2 | 1,473 | — |
Reasoning GPT-5.1 leads
GPT-5.1: 39.8 (#58), Muse Spark: 35.9 (#67)
| Benchmark | GPT-5.1 | Muse Spark |
|---|---|---|
| CritPt | 4.9% | 11.3% |
| LMArena Hard Prompts | 1457 | 1474 |
| Epoch Capabilities Index | 149.64 | 152.04 |
| ARC-AGI-2 | 17.6% | — |
| SimpleBench | 53.2% | — |
| ARC-AGI-1 | 72.8% | — |
| Chess Puzzles | 32% | — |
| EnigmaEval | 11.2% | — |
| LiveBench Reasoning | 95.8% | — |
| Mystery Game Puzzles | 19% | — |
| DTBench | 90.1% | — |
| LiveBench Data Analysis | 72.1% | — |
| LMCA | 43.9% | — |
| ForecastBench | 58.1 | — |
| LiveBench | 78.8% | — |
Math GPT-5.1 leads
GPT-5.1: 52.2 (#51), Muse Spark: 47.8 (#66)
| Benchmark | GPT-5.1 | Muse Spark |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 88.6% | 88.9% |
| LMArena Math | 1447 | 1455 |
| FrontierMath (Feb 2025 set) | 31% | 39% |
| FrontierMath Tier 4 (v1) | 12.5% | 14.6% |
| ProofBench | — | 17% |
| Omni-MATH | 46.4% | — |
| LiveBench Math | 94.5% | — |
Knowledge Muse Spark leads
GPT-5.1: 50.6 (#71), Muse Spark: 65.7 (#13)
| Benchmark | GPT-5.1 | Muse Spark |
|---|---|---|
| GPQA Diamond | 87.6% | 89.8% |
| Humanity's Last Exam | 23.7% | 40.6% |
| LMArena Expert | 1470 | 1457 |
| SimpleQA Verified | 48% | — |
| MMLU-Pro | 57.9% | — |
| Vectara Hallucination Rate | 10.9% | — |
| GPQA (HELM) | 44.2% | — |
Multimodal GPT-5.1 leads
GPT-5.1: 44.8 (#19), Muse Spark: 43.4 (#24)
| Benchmark | GPT-5.1 | Muse Spark |
|---|---|---|
| LMArena Vision | 1250 | 1306 |
| LMArena Document | 1403 | 1444 |
| VPCT | 58.7% | — |
Multilingual Muse Spark leads
GPT-5.1: 53.8 (#56), Muse Spark: 56.1 (#24)
| Benchmark | GPT-5.1 | Muse Spark |
|---|---|---|
| LMArena Non-English | 1431 | 1464 |
| LMArena Chinese | 1495 | 1509 |
| LMArena French | 1450 | 1497 |
| LMArena German | 1438 | 1497 |
| LMArena Korean | 1401 | 1459 |
| LMArena Russian | 1435 | 1466 |
| LMArena Spanish | 1433 | 1472 |
| LMArena Japanese | 1453 | — |
Instruction Following GPT-5.1 leads
GPT-5.1: 83.9 (#1), Muse Spark: 75.9 (#51)
| Benchmark | GPT-5.1 | Muse Spark |
|---|---|---|
| LMArena Instruction Following | 1443 | 1442 |
| LiveBench Instruction Following | 93.3% | — |
| IFEval | 93.5% | — |
Long Context GPT-5.1 leads
GPT-5.1: 47.6 (#14), Muse Spark: 44.4 (#69)
| Benchmark | GPT-5.1 | Muse Spark |
|---|---|---|
| LMArena Longer Query | 1447 | 1451 |
| CL-bench | 23.7% | — |
| CL-bench Life | 17.3% | — |
Writing & Preference Muse Spark leads
GPT-5.1: 64.5 (#55), Muse Spark: 66.0 (#39)
| Benchmark | GPT-5.1 | Muse Spark |
|---|---|---|
| LMArena Text | 1443 | 1474 |
| LMArena Creative Writing | 1427 | 1459 |
| LMArena Multi-Turn | 1450 | 1477 |
| WildBench | 86.3% | — |
| LiveBench Language | 80.2% | — |
Frequently asked questions
Is GPT-5.1 better than Muse Spark?
Muse Spark is the stronger model overall, scoring 50.6 to 49.0 on the Noometry Index.
Is GPT-5.1 or Muse Spark better for coding?
They score almost the same on coding (46.4 vs 46.2); test both on your own repository before choosing.
How many benchmarks do GPT-5.1 and Muse Spark share?
26 benchmarks have published results for both models. GPT-5.1 has 63 scored results on Noometry and Muse Spark has 27.