Model comparison
Grok 4.3 vs Muse Spark
Muse Spark is the stronger model overall, scoring 50.6 to 43.8 on the Noometry Index.
Last verified . 23 shared benchmarks.
MetaSummary
- They share 23 benchmarks with published results for both. Grok 4.3 scores higher in 0 categories and Muse Spark in 9 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Muse Spark leads 65.7 to 52.5.
- The biggest single-benchmark swing is ProofBench: 11% for Grok 4.3 and 17% for Muse Spark.
Side by side
| Grok 4.3 | Muse Spark | |
|---|---|---|
| Provider | xAI | Meta |
| Noometry Index | 43.8 | 50.6 |
| Released | 2026-04-17 | 2026-04-08 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | — |
| Max output | 30K | — |
| Input $ / M tokens | $1.25 | — |
| Output $ / M tokens | $2.50 | — |
| Results tracked | 40 | 27 |
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Category by category
Coding Muse Spark leads
Grok 4.3: 41.6 (#121), Muse Spark: 46.2 (#69)
| Benchmark | Grok 4.3 | Muse Spark |
|---|---|---|
| SciCode | 47.3% | 51.5% |
| LMArena Coding | 1415 | 1481 |
| LMArena WebDev | 1357 | — |
| WeirdML | 49.9% | — |
| ALE-Bench | 944.17 | — |
Agentic & Tool Use Not comparable
Grok 4.3: 27.7 (#99), Muse Spark: —
| Benchmark | Grok 4.3 | Muse Spark |
|---|---|---|
| GDP.pdf | 8% | — |
| LMArena Search | 1165 | — |
| Vending-Bench 2 | 35.26 | — |
Reasoning Too close to call
Grok 4.3: 35.9 (#68), Muse Spark: 35.9 (#67)
| Benchmark | Grok 4.3 | Muse Spark |
|---|---|---|
| CritPt | 8% | 11.3% |
| LMArena Hard Prompts | 1396 | 1474 |
| Epoch Capabilities Index | 149.16 | 152.04 |
| NYT Connections (extended) | 55.2% | — |
| Chess Puzzles | 25% | — |
| DTBench | 90.7% | — |
| LMCA | 38.3% | — |
| ForecastBench | 60.3 | — |
Math Muse Spark leads
Grok 4.3: 46.0 (#74), Muse Spark: 47.8 (#66)
| Benchmark | Grok 4.3 | Muse Spark |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 93.3% | 88.9% |
| ProofBench | 11% | 17% |
| LMArena Math | 1388 | 1455 |
| FrontierMath (Tiers 1-3) | 42.8% | — |
| FrontierMath Tier 4 | 14.6% | — |
| FrontierMath (Feb 2025 set) | — | 39% |
| FrontierMath Tier 4 (v1) | — | 14.6% |
Knowledge Muse Spark leads
Grok 4.3: 52.5 (#62), Muse Spark: 65.7 (#13)
| Benchmark | Grok 4.3 | Muse Spark |
|---|---|---|
| GPQA Diamond | 88.8% | 89.8% |
| LMArena Expert | 1385 | 1457 |
| Humanity's Last Exam | — | 40.6% |
| SimpleQA Verified | 33.2% | — |
Multimodal Muse Spark leads
Grok 4.3: 31.6 (#104), Muse Spark: 43.4 (#24)
| Benchmark | Grok 4.3 | Muse Spark |
|---|---|---|
| LMArena Vision | 1229 | 1306 |
| Blueprint-Bench 2 | 0% | — |
| LMArena Document | — | 1444 |
Multilingual Muse Spark leads
Grok 4.3: 50.5 (#120), Muse Spark: 56.1 (#24)
| Benchmark | Grok 4.3 | Muse Spark |
|---|---|---|
| LMArena Non-English | 1385 | 1464 |
| LMArena Chinese | 1422 | 1509 |
| LMArena French | 1412 | 1497 |
| LMArena German | 1395 | 1497 |
| LMArena Korean | 1356 | 1459 |
| LMArena Russian | 1399 | 1466 |
| LMArena Spanish | 1398 | 1472 |
| LMArena Japanese | 1379 | — |
Instruction Following Muse Spark leads
Grok 4.3: 72.1 (#140), Muse Spark: 75.9 (#51)
| Benchmark | Grok 4.3 | Muse Spark |
|---|---|---|
| LMArena Instruction Following | 1366 | 1442 |
Long Context Muse Spark leads
Grok 4.3: 42.5 (#123), Muse Spark: 44.4 (#69)
| Benchmark | Grok 4.3 | Muse Spark |
|---|---|---|
| LMArena Longer Query | 1393 | 1451 |
Writing & Preference Muse Spark leads
Grok 4.3: 58.5 (#118), Muse Spark: 66.0 (#39)
| Benchmark | Grok 4.3 | Muse Spark |
|---|---|---|
| LMArena Text | 1397 | 1474 |
| LMArena Creative Writing | 1380 | 1459 |
| LMArena Multi-Turn | 1406 | 1477 |
| EQ-Bench 4 | 1075 | — |
Frequently asked questions
Is Grok 4.3 better than Muse Spark?
Muse Spark is the stronger model overall, scoring 50.6 to 43.8 on the Noometry Index.
Is Grok 4.3 or Muse Spark better for coding?
Muse Spark scores higher on coding benchmarks: 46.2 versus 41.6 in the Noometry coding category.
How many benchmarks do Grok 4.3 and Muse Spark share?
23 benchmarks have published results for both models. Grok 4.3 has 40 scored results on Noometry and Muse Spark has 27.