Model comparison
Grok 4.3 vs Muse Spark 1.2
Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 43.8 on the Noometry Index.
Last verified . 26 shared benchmarks.
MetaSummary
- They share 26 benchmarks with published results for both. Grok 4.3 scores higher in 0 categories and Muse Spark 1.2 in 10 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Muse Spark 1.2 leads 51.3 to 35.9.
- The biggest single-benchmark swing is ProofBench: 11% for Grok 4.3 and 43% for Muse Spark 1.2.
- Grok 4.3 is cheaper at $1.25 / $2.50 per million input/output tokens, against $1.25 / $4.25 for Muse Spark 1.2.
- Muse Spark 1.2 accepts more context: 1.05M tokens versus 1M.
Side by side
| Grok 4.3 | Muse Spark 1.2 | |
|---|---|---|
| Provider | xAI | Meta |
| Noometry Index | 43.8 | 50.3 |
| Released | 2026-04-17 | 2026-08-05 |
| 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 | 31 |
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Category by category
Coding Muse Spark 1.2 leads
Grok 4.3: 41.6 (#121), Muse Spark 1.2: 49.2 (#51)
| Benchmark | Grok 4.3 | Muse Spark 1.2 |
|---|---|---|
| LMArena WebDev | 1357 | 1533 |
| SciCode | 47.3% | 56.4% |
| WeirdML | 49.9% | 60.3% |
| LMArena Coding | 1415 | 1495 |
| DeepSWE | — | 54.9% |
| FrontierSWE | — | 12% |
| ALE-Bench | 944.17 | — |
Agentic & Tool Use Muse Spark 1.2 leads
Grok 4.3: 27.7 (#99), Muse Spark 1.2: 29.4 (#87)
| Benchmark | Grok 4.3 | Muse Spark 1.2 |
|---|---|---|
| GDP.pdf | 8% | 16% |
| APEX-Agents | — | 36.4% |
| LMArena Search | 1165 | — |
| Vending-Bench 2 | 35.26 | — |
Reasoning Muse Spark 1.2 leads
Grok 4.3: 35.9 (#68), Muse Spark 1.2: 51.3 (#34)
| Benchmark | Grok 4.3 | Muse Spark 1.2 |
|---|---|---|
| NYT Connections (extended) | 55.2% | 79.2% |
| CritPt | 8% | 17.7% |
| LMArena Hard Prompts | 1396 | 1486 |
| DTBench | 90.7% | 94.7% |
| LMCA | 38.3% | 48.4% |
| Epoch Capabilities Index | 149.16 | 154.87 |
| SimpleBench | — | 74.5% |
| Chess Puzzles | 25% | — |
| ForecastBench | 60.3 | — |
Math Too close to call
Grok 4.3: 46.0 (#74), Muse Spark 1.2: 46.4 (#70)
| Benchmark | Grok 4.3 | Muse Spark 1.2 |
|---|---|---|
| ProofBench | 11% | 43% |
| LMArena Math | 1388 | 1471 |
| FrontierMath (Tiers 1-3) | 42.8% | — |
| FrontierMath Tier 4 | 14.6% | — |
| OTIS Mock AIME 2024-2025 | 93.3% | — |
Knowledge Muse Spark 1.2 leads
Grok 4.3: 52.5 (#62), Muse Spark 1.2: 54.1 (#53)
| Benchmark | Grok 4.3 | Muse Spark 1.2 |
|---|---|---|
| SimpleQA Verified | 33.2% | 60.3% |
| LMArena Expert | 1385 | 1480 |
| GPQA Diamond | 88.8% | — |
Multimodal Muse Spark 1.2 leads
Grok 4.3: 31.6 (#104), Muse Spark 1.2: 43.4 (#25)
| Benchmark | Grok 4.3 | Muse Spark 1.2 |
|---|---|---|
| LMArena Vision | 1229 | 1305 |
| Blueprint-Bench 2 | 0% | — |
Multilingual Muse Spark 1.2 leads
Grok 4.3: 50.5 (#120), Muse Spark 1.2: 57.1 (#11)
| Benchmark | Grok 4.3 | Muse Spark 1.2 |
|---|---|---|
| LMArena Non-English | 1385 | 1478 |
| LMArena Chinese | 1422 | 1511 |
| LMArena French | 1412 | 1513 |
| LMArena Russian | 1399 | 1487 |
| LMArena Spanish | 1398 | 1498 |
| LMArena German | 1395 | — |
| LMArena Japanese | 1379 | — |
| LMArena Korean | 1356 | — |
Instruction Following Muse Spark 1.2 leads
Grok 4.3: 72.1 (#140), Muse Spark 1.2: 76.7 (#36)
| Benchmark | Grok 4.3 | Muse Spark 1.2 |
|---|---|---|
| LMArena Instruction Following | 1366 | 1461 |
Long Context Muse Spark 1.2 leads
Grok 4.3: 42.5 (#123), Muse Spark 1.2: 45.2 (#48)
| Benchmark | Grok 4.3 | Muse Spark 1.2 |
|---|---|---|
| LMArena Longer Query | 1393 | 1475 |
Writing & Preference Muse Spark 1.2 leads
Grok 4.3: 58.5 (#118), Muse Spark 1.2: 72.3 (#14)
| Benchmark | Grok 4.3 | Muse Spark 1.2 |
|---|---|---|
| LMArena Text | 1397 | 1482 |
| LMArena Creative Writing | 1380 | 1449 |
| LMArena Multi-Turn | 1406 | 1494 |
| EQ-Bench Creative Writing | — | 1840 |
| EQ-Bench 4 | 1075 | — |
Frequently asked questions
Is Grok 4.3 better than Muse Spark 1.2?
Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 43.8 on the Noometry Index.
Which is cheaper, Grok 4.3 or Muse Spark 1.2?
Grok 4.3 is cheaper. It lists at $1.25 per million input tokens and $2.50 per million output tokens; Muse Spark 1.2 lists at $1.25 and $4.25.
Is Grok 4.3 or Muse Spark 1.2 better for coding?
Muse Spark 1.2 scores higher on coding benchmarks: 49.2 versus 41.6 in the Noometry coding category.
Which has the bigger context window?
Muse Spark 1.2 does, with 1.05M tokens against 1M.
How many benchmarks do Grok 4.3 and Muse Spark 1.2 share?
26 benchmarks have published results for both models. Grok 4.3 has 40 scored results on Noometry and Muse Spark 1.2 has 31.