Model comparison
Grok 4.3 vs Muse Spark 1.3
Muse Spark 1.3 is the stronger model overall, scoring 54.8 to 43.8 on the Noometry Index.
Last verified . 31 shared benchmarks.
MetaSummary
- They share 31 benchmarks with published results for both. Grok 4.3 scores higher in 1 category and Muse Spark 1.3 in 9 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in math, where Muse Spark 1.3 leads 73.1 to 46.0.
- The biggest single-benchmark swing is ProofBench: 11% for Grok 4.3 and 58% for Muse Spark 1.3.
- Grok 4.3 is cheaper at $1.25 / $2.50 per million input/output tokens, against $1.25 / $4.25 for Muse Spark 1.3.
- Muse Spark 1.3 accepts more context: 1.05M tokens versus 1M.
Side by side
| Grok 4.3 | Muse Spark 1.3 | |
|---|---|---|
| Provider | xAI | Meta |
| Noometry Index | 43.8 | 54.8 |
| Released | 2026-04-17 | 2026-09-02 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 1.05M |
| Max output | 30K | 131K |
| Input $ / M tokens | $1.25 | $1.25 |
| Output $ / M tokens | $2.50 | $4.25 |
| Results tracked | 40 | 37 |
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Category by category
Coding Muse Spark 1.3 leads
Grok 4.3: 41.6 (#121), Muse Spark 1.3: 56.6 (#21)
| Benchmark | Grok 4.3 | Muse Spark 1.3 |
|---|---|---|
| LMArena WebDev | 1357 | 1657 |
| SciCode | 47.3% | 59.7% |
| LMArena Coding | 1415 | 1514 |
| CursorBench | — | 41.6% |
| WeirdML | 49.9% | — |
| ALE-Bench | 944.17 | — |
Agentic & Tool Use Muse Spark 1.3 leads
Grok 4.3: 27.7 (#99), Muse Spark 1.3: 38.6 (#30)
| Benchmark | Grok 4.3 | Muse Spark 1.3 |
|---|---|---|
| GDP.pdf | 8% | 27.6% |
| APEX-Agents | — | 57.8% |
| LMArena Search | 1165 | — |
| Vending-Bench 2 | 35.26 | — |
Reasoning Muse Spark 1.3 leads
Grok 4.3: 35.9 (#68), Muse Spark 1.3: 54.0 (#27)
| Benchmark | Grok 4.3 | Muse Spark 1.3 |
|---|---|---|
| NYT Connections (extended) | 55.2% | 85.1% |
| CritPt | 8% | 26% |
| Chess Puzzles | 25% | 38% |
| LMArena Hard Prompts | 1396 | 1503 |
| DTBench | 90.7% | 96.5% |
| LMCA | 38.3% | 53.9% |
| Epoch Capabilities Index | 149.16 | 156.75 |
| Mystery Game Puzzles | — | 25% |
| Bench to the Future 3 | — | 0.14 |
| ForecastBench | 60.3 | — |
Math Muse Spark 1.3 leads
Grok 4.3: 46.0 (#74), Muse Spark 1.3: 73.1 (#21)
| Benchmark | Grok 4.3 | Muse Spark 1.3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 42.8% | 74.4% |
| FrontierMath Tier 4 | 14.6% | 46.3% |
| OTIS Mock AIME 2024-2025 | 93.3% | 99.2% |
| ProofBench | 11% | 58% |
| LMArena Math | 1388 | 1494 |
Knowledge Grok 4.3 leads
Grok 4.3: 52.5 (#62), Muse Spark 1.3: 42.6 (#95)
| Benchmark | Grok 4.3 | Muse Spark 1.3 |
|---|---|---|
| LMArena Expert | 1385 | 1516 |
| GPQA Diamond | 88.8% | — |
| SimpleQA Verified | 33.2% | — |
Multimodal Muse Spark 1.3 leads
Grok 4.3: 31.6 (#104), Muse Spark 1.3: 43.7 (#22)
| Benchmark | Grok 4.3 | Muse Spark 1.3 |
|---|---|---|
| LMArena Vision | 1229 | 1309 |
| Blueprint-Bench 2 | 0% | — |
| LMArena Document | — | 1471 |
Multilingual Muse Spark 1.3 leads
Grok 4.3: 50.5 (#120), Muse Spark 1.3: 57.4 (#8)
| Benchmark | Grok 4.3 | Muse Spark 1.3 |
|---|---|---|
| LMArena Non-English | 1385 | 1481 |
| LMArena Chinese | 1422 | 1529 |
| LMArena French | 1412 | 1524 |
| LMArena German | 1395 | 1515 |
| LMArena Japanese | 1379 | 1474 |
| LMArena Korean | 1356 | 1501 |
| LMArena Russian | 1399 | 1490 |
| LMArena Spanish | 1398 | 1490 |
Instruction Following Muse Spark 1.3 leads
Grok 4.3: 72.1 (#140), Muse Spark 1.3: 77.5 (#22)
| Benchmark | Grok 4.3 | Muse Spark 1.3 |
|---|---|---|
| LMArena Instruction Following | 1366 | 1477 |
Long Context Muse Spark 1.3 leads
Grok 4.3: 42.5 (#123), Muse Spark 1.3: 45.6 (#32)
| Benchmark | Grok 4.3 | Muse Spark 1.3 |
|---|---|---|
| LMArena Longer Query | 1393 | 1488 |
Writing & Preference Muse Spark 1.3 leads
Grok 4.3: 58.5 (#118), Muse Spark 1.3: 73.6 (#9)
| Benchmark | Grok 4.3 | Muse Spark 1.3 |
|---|---|---|
| LMArena Text | 1397 | 1490 |
| LMArena Creative Writing | 1380 | 1455 |
| LMArena Multi-Turn | 1406 | 1482 |
| EQ-Bench Creative Writing | — | 1906 |
| EQ-Bench 4 | 1075 | — |
Frequently asked questions
Is Grok 4.3 better than Muse Spark 1.3?
Muse Spark 1.3 is the stronger model overall, scoring 54.8 to 43.8 on the Noometry Index.
Which is cheaper, Grok 4.3 or Muse Spark 1.3?
Grok 4.3 is cheaper. It lists at $1.25 per million input tokens and $2.50 per million output tokens; Muse Spark 1.3 lists at $1.25 and $4.25.
Is Grok 4.3 or Muse Spark 1.3 better for coding?
Muse Spark 1.3 scores higher on coding benchmarks: 56.6 versus 41.6 in the Noometry coding category.
Which has the bigger context window?
Muse Spark 1.3 does, with 1.05M tokens against 1M.
How many benchmarks do Grok 4.3 and Muse Spark 1.3 share?
31 benchmarks have published results for both models. Grok 4.3 has 40 scored results on Noometry and Muse Spark 1.3 has 37.