Model comparison
Grok 4.5 vs Muse Spark 1.3
Grok 4.5 and Muse Spark 1.3 score almost the same on the Noometry Index (55.0 vs 54.8), so choose on price, context window or the category you care about most.
Last verified . 34 shared benchmarks.
MetaSummary
- They share 34 benchmarks with published results for both. Grok 4.5 scores higher in 3 categories and Muse Spark 1.3 in 7 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Grok 4.5 leads 62.3 to 42.6.
- The biggest single-benchmark swing is ProofBench: 31% for Grok 4.5 and 58% for Muse Spark 1.3.
- Muse Spark 1.3 is cheaper at $1.25 / $4.25 per million input/output tokens, against $2 / $6 for Grok 4.5.
- Muse Spark 1.3 accepts more context: 1.05M tokens versus 500K.
Side by side
| Grok 4.5 | Muse Spark 1.3 | |
|---|---|---|
| Provider | xAI | Meta |
| Noometry Index | 55.0 | 54.8 |
| Released | 2026-07-08 | 2026-09-02 |
| Weights | Proprietary | Proprietary |
| Context window | 500K | 1.05M |
| Max output | 500K | 131K |
| Input $ / M tokens | $2 | $1.25 |
| Output $ / M tokens | $6 | $4.25 |
| Results tracked | 52 | 37 |
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Category by category
Coding Muse Spark 1.3 leads
Grok 4.5: 52.2 (#35), Muse Spark 1.3: 56.6 (#21)
| Benchmark | Grok 4.5 | Muse Spark 1.3 |
|---|---|---|
| LMArena WebDev | 1553 | 1657 |
| SciCode | 54.1% | 59.7% |
| LMArena Coding | 1474 | 1514 |
| DeepSWE | 53.8% | — |
| FrontierCode | 42.4% | — |
| CursorBench | — | 41.6% |
| WeirdML | 46.4% | — |
| ALE-Bench | 1,309 | — |
Agentic & Tool Use Grok 4.5 leads
Grok 4.5: 44.4 (#17), Muse Spark 1.3: 38.6 (#30)
| Benchmark | Grok 4.5 | Muse Spark 1.3 |
|---|---|---|
| APEX-Agents | 56.2% | 57.8% |
| GDP.pdf | 14% | 27.6% |
| τ²-bench Banking | 47.9% | — |
| PostTrainBench | 23.4% | — |
| GBAEval | 65.4% | — |
| LMArena Search | 1213 | — |
| Vending-Bench 2 | 3,887 | — |
Reasoning Grok 4.5 leads
Grok 4.5: 56.1 (#25), Muse Spark 1.3: 54.0 (#27)
| Benchmark | Grok 4.5 | Muse Spark 1.3 |
|---|---|---|
| NYT Connections (extended) | 79.9% | 85.1% |
| CritPt | 15.4% | 26% |
| Chess Puzzles | 36% | 38% |
| LMArena Hard Prompts | 1462 | 1503 |
| DTBench | 96.5% | 96.5% |
| LMCA | 45.2% | 53.9% |
| Epoch Capabilities Index | 153.92 | 156.75 |
| ARC-AGI-2 | 52.6% | — |
| SimpleBench | 70% | — |
| Kagi LLM Benchmark | 83.5% | — |
| ARC-AGI-1 | 87.2% | — |
| Mystery Game Puzzles | — | 25% |
| Surface Evolver Bench | 74.4% | — |
| Bench to the Future 3 | — | 0.14 |
Math Muse Spark 1.3 leads
Grok 4.5: 60.9 (#35), Muse Spark 1.3: 73.1 (#21)
| Benchmark | Grok 4.5 | Muse Spark 1.3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 57.2% | 74.4% |
| FrontierMath Tier 4 | 24.4% | 46.3% |
| OTIS Mock AIME 2024-2025 | 97.8% | 99.2% |
| ProofBench | 31% | 58% |
| LMArena Math | 1459 | 1494 |
Knowledge Grok 4.5 leads
Grok 4.5: 62.3 (#24), Muse Spark 1.3: 42.6 (#95)
| Benchmark | Grok 4.5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Expert | 1466 | 1516 |
| GPQA Diamond | 93.4% | — |
| SimpleQA Verified | 48.3% | — |
Multimodal Muse Spark 1.3 leads
Grok 4.5: 37.6 (#72), Muse Spark 1.3: 43.7 (#22)
| Benchmark | Grok 4.5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Vision | 1288 | 1309 |
| LMArena Document | 1452 | 1471 |
| Blueprint-Bench 2 | 27.3% | — |
| Furniture Assembly | 22.5% | — |
Multilingual Muse Spark 1.3 leads
Grok 4.5: 54.4 (#42), Muse Spark 1.3: 57.4 (#8)
| Benchmark | Grok 4.5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Non-English | 1440 | 1481 |
| LMArena Chinese | 1496 | 1529 |
| LMArena French | 1456 | 1524 |
| LMArena German | 1446 | 1515 |
| LMArena Japanese | 1428 | 1474 |
| LMArena Korean | 1404 | 1501 |
| LMArena Russian | 1448 | 1490 |
| LMArena Spanish | 1450 | 1490 |
Instruction Following Muse Spark 1.3 leads
Grok 4.5: 76.0 (#48), Muse Spark 1.3: 77.5 (#22)
| Benchmark | Grok 4.5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Instruction Following | 1446 | 1477 |
Long Context Too close to call
Grok 4.5: 44.8 (#56), Muse Spark 1.3: 45.6 (#32)
| Benchmark | Grok 4.5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Longer Query | 1463 | 1488 |
Writing & Preference Muse Spark 1.3 leads
Grok 4.5: 65.8 (#42), Muse Spark 1.3: 73.6 (#9)
| Benchmark | Grok 4.5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Text | 1448 | 1490 |
| LMArena Creative Writing | 1442 | 1455 |
| EQ-Bench Creative Writing | 1579 | 1906 |
| LMArena Multi-Turn | 1456 | 1482 |
Frequently asked questions
Is Grok 4.5 better than Muse Spark 1.3?
Grok 4.5 and Muse Spark 1.3 score almost the same on the Noometry Index (55.0 vs 54.8), so choose on price, context window or the category you care about most.
Which is cheaper, Grok 4.5 or Muse Spark 1.3?
Muse Spark 1.3 is cheaper. It lists at $1.25 per million input tokens and $4.25 per million output tokens; Grok 4.5 lists at $2 and $6.
Is Grok 4.5 or Muse Spark 1.3 better for coding?
Muse Spark 1.3 scores higher on coding benchmarks: 56.6 versus 52.2 in the Noometry coding category.
Which has the bigger context window?
Muse Spark 1.3 does, with 1.05M tokens against 500K.
How many benchmarks do Grok 4.5 and Muse Spark 1.3 share?
34 benchmarks have published results for both models. Grok 4.5 has 52 scored results on Noometry and Muse Spark 1.3 has 37.