Model comparison
Grok 4.20 (Non-Reasoning) vs Muse Spark
Muse Spark is the stronger model overall, scoring 50.3 to 48.5 on the Noometry Index.
Last verified . 22 shared benchmarks.
MetaSummary
- They share 22 benchmarks with published results for both. Grok 4.20 (Non-Reasoning) scores higher in 3 categories and Muse Spark in 6 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.20 (Non-Reasoning) leads 52.2 to 34.9.
Side by side
| Grok 4.20 (Non-Reasoning) | Muse Spark | |
|---|---|---|
| Provider | xAI | Meta |
| Noometry Index | 48.5 | 50.3 |
| Released | 2026-02-17 | 2026-04-08 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | — |
| Max output | 30K | — |
| Input $ / M tokens | $1.25 | — |
| Output $ / M tokens | $2.50 | — |
| Results tracked | 46 | 27 |
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Category by category
Coding Muse Spark leads
Grok 4.20 (Non-Reasoning): 41.8 (#104), Muse Spark: 45.6 (#65)
| Benchmark | Grok 4.20 (Non-Reasoning) | Muse Spark |
|---|---|---|
| LMArena Coding | 1458 | 1482 |
| LMArena WebDev | 1374 | — |
| SciCode | — | 51.5% |
| WeirdML | 52.3% | — |
| ALE-Bench | 1,150 | — |
Agentic & Tool Use Not comparable
Grok 4.20 (Non-Reasoning): 34.3 (#43), Muse Spark: —
| Benchmark | Grok 4.20 (Non-Reasoning) | Muse Spark |
|---|---|---|
| Terminal-Bench | 57.3% | — |
| τ²-bench Banking | 18% | — |
| LMArena Search | 1189 | — |
| Vending-Bench 2 | 4,663 | — |
Reasoning Grok 4.20 (Non-Reasoning) leads
Grok 4.20 (Non-Reasoning): 52.2 (#30), Muse Spark: 34.9 (#61)
| Benchmark | Grok 4.20 (Non-Reasoning) | Muse Spark |
|---|---|---|
| LMArena Hard Prompts | 1451 | 1475 |
| Epoch Capabilities Index | 152.01 | 152.09 |
| ARC-AGI-2 | 65.1% | — |
| Kagi LLM Benchmark | 75% | — |
| NYT Connections (extended) | 85.4% | — |
| ARC-AGI-1 | 89.5% | — |
| CritPt | — | 11.3% |
| Chess Puzzles | 24% | — |
| Thematic Generalization | 63.8% | — |
| DTBench | 90.1% | — |
| LMCA | 38.7% | — |
| ForecastBench | 61.4 | — |
Math Grok 4.20 (Non-Reasoning) leads
Grok 4.20 (Non-Reasoning): 48.0 (#54), Muse Spark: 46.8 (#57)
| Benchmark | Grok 4.20 (Non-Reasoning) | Muse Spark |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 92.2% | 88.9% |
| ProofBench | 14% | 17% |
| LMArena Math | 1455 | 1455 |
| FrontierMath (Tiers 1-3) | 44.9% | — |
| FrontierMath Tier 4 | 17.1% | — |
| FrontierMath (Feb 2025 set) | — | 39% |
| FrontierMath Tier 4 (v1) | — | 14.6% |
Knowledge Muse Spark leads
Grok 4.20 (Non-Reasoning): 52.8 (#54), Muse Spark: 65.7 (#12)
| Benchmark | Grok 4.20 (Non-Reasoning) | Muse Spark |
|---|---|---|
| GPQA Diamond | 89.3% | 89.8% |
| LMArena Expert | 1440 | 1458 |
| Humanity's Last Exam | — | 40.6% |
| SimpleQA Verified | 30.2% | — |
Multimodal Muse Spark leads
Grok 4.20 (Non-Reasoning): 33.2 (#88), Muse Spark: 42.7 (#23)
| Benchmark | Grok 4.20 (Non-Reasoning) | Muse Spark |
|---|---|---|
| LMArena Vision | 1263 | 1306 |
| LMArena Document | 1416 | 1444 |
| Blueprint-Bench 2 | 0% | — |
Multilingual Muse Spark leads
Grok 4.20 (Non-Reasoning): 54.7 (#38), Muse Spark: 56.3 (#23)
| Benchmark | Grok 4.20 (Non-Reasoning) | Muse Spark |
|---|---|---|
| LMArena Non-English | 1440 | 1464 |
| LMArena Chinese | 1481 | 1507 |
| LMArena French | 1477 | 1497 |
| LMArena German | 1463 | 1497 |
| LMArena Korean | 1417 | 1457 |
| LMArena Russian | 1457 | 1467 |
| LMArena Spanish | 1442 | 1471 |
| LMArena Japanese | 1450 | — |
Instruction Following Muse Spark leads
Grok 4.20 (Non-Reasoning): 75.0 (#79), Muse Spark: 76.1 (#47)
| Benchmark | Grok 4.20 (Non-Reasoning) | Muse Spark |
|---|---|---|
| LMArena Instruction Following | 1420 | 1443 |
Long Context Grok 4.20 (Non-Reasoning) leads
Grok 4.20 (Non-Reasoning): 45.4 (#33), Muse Spark: 44.4 (#65)
| Benchmark | Grok 4.20 (Non-Reasoning) | Muse Spark |
|---|---|---|
| LMArena Longer Query | 1436 | 1451 |
| CL-bench | 22.2% | — |
| CL-bench Life | 11.9% | — |
Writing & Preference Too close to call
Grok 4.20 (Non-Reasoning): 65.9 (#42), Muse Spark: 66.2 (#37)
| Benchmark | Grok 4.20 (Non-Reasoning) | Muse Spark |
|---|---|---|
| LMArena Text | 1451 | 1474 |
| LMArena Creative Writing | 1439 | 1460 |
| LMArena Multi-Turn | 1456 | 1477 |
| EQ-Bench Creative Writing | 1574 | — |
Frequently asked questions
Is Grok 4.20 (Non-Reasoning) better than Muse Spark?
Muse Spark is the stronger model overall, scoring 50.3 to 48.5 on the Noometry Index.
Is Grok 4.20 (Non-Reasoning) or Muse Spark better for coding?
Muse Spark scores higher on coding benchmarks: 45.6 versus 41.8 in the Noometry coding category.
How many benchmarks do Grok 4.20 (Non-Reasoning) and Muse Spark share?
22 benchmarks have published results for both models. Grok 4.20 (Non-Reasoning) has 46 scored results on Noometry and Muse Spark has 27.