Model comparison
Grok 4.1 Fast vs Muse Spark 1.3
Muse Spark 1.3 is the stronger model overall, scoring 54.8 to 41.4 on the Noometry Index. Grok 4.1 Fast costs 7.3× less per token, which makes it the better buy when Muse Spark 1.3's lead doesn't matter for your workload.
Last verified . 23 shared benchmarks.
MetaSummary
- They share 23 benchmarks with published results for both. Grok 4.1 Fast scores higher in 0 categories and Muse Spark 1.3 in 10 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in math, where Muse Spark 1.3 leads 73.1 to 31.9.
- The biggest single-benchmark swing is ProofBench: 4% for Grok 4.1 Fast and 58% for Muse Spark 1.3.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 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 128K.
Side by side
| Grok 4.1 Fast | Muse Spark 1.3 | |
|---|---|---|
| Provider | xAI | Meta |
| Noometry Index | 41.4 | 54.8 |
| Released | 2025-06-27 | 2026-09-02 |
| Weights | Proprietary | Proprietary |
| Context window | 128K | 1.05M |
| Max output | 30K | 131K |
| Input $ / M tokens | $0.20 | $1.25 |
| Output $ / M tokens | $0.50 | $4.25 |
| Results tracked | 32 | 37 |
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Category by category
Coding Muse Spark 1.3 leads
Grok 4.1 Fast: 34.1 (#245), Muse Spark 1.3: 56.6 (#21)
| Benchmark | Grok 4.1 Fast | Muse Spark 1.3 |
|---|---|---|
| LMArena WebDev | 1242 | 1657 |
| LMArena Coding | 1411 | 1514 |
| CursorBench | — | 41.6% |
| SciCode | — | 59.7% |
| ALE-Bench | 394.93 | — |
Agentic & Tool Use Muse Spark 1.3 leads
Grok 4.1 Fast: 36.3 (#39), Muse Spark 1.3: 38.6 (#30)
| Benchmark | Grok 4.1 Fast | Muse Spark 1.3 |
|---|---|---|
| APEX-Agents | — | 57.8% |
| Berkeley Function Calling Leaderboard | 69.6% | — |
| τ²-bench Banking | 13.1% | — |
| GDP.pdf | — | 27.6% |
| LMArena Search | 1171 | — |
| Vending-Bench 2 | 1,107 | — |
Reasoning Muse Spark 1.3 leads
Grok 4.1 Fast: 43.4 (#49), Muse Spark 1.3: 54.0 (#27)
| Benchmark | Grok 4.1 Fast | Muse Spark 1.3 |
|---|---|---|
| NYT Connections (extended) | 87.4% | 85.1% |
| LMArena Hard Prompts | 1407 | 1503 |
| DTBench | 87.7% | 96.5% |
| SimpleBench | 56% | — |
| CritPt | — | 26% |
| Chess Puzzles | — | 38% |
| Mystery Game Puzzles | — | 25% |
| LMCA | — | 53.9% |
| Bench to the Future 3 | — | 0.14 |
| Epoch Capabilities Index | — | 156.75 |
| ForecastBench | 61 | — |
Math Muse Spark 1.3 leads
Grok 4.1 Fast: 31.9 (#221), Muse Spark 1.3: 73.1 (#21)
| Benchmark | Grok 4.1 Fast | Muse Spark 1.3 |
|---|---|---|
| ProofBench | 4% | 58% |
| LMArena Math | 1408 | 1494 |
| FrontierMath (Tiers 1-3) | — | 74.4% |
| FrontierMath Tier 4 | — | 46.3% |
| MathArena Final-Answer Competitions | 60.9% | — |
| OTIS Mock AIME 2024-2025 | — | 99.2% |
Knowledge Muse Spark 1.3 leads
Grok 4.1 Fast: 33.1 (#207), Muse Spark 1.3: 42.6 (#95)
| Benchmark | Grok 4.1 Fast | Muse Spark 1.3 |
|---|---|---|
| LMArena Expert | 1399 | 1516 |
| Vectara Hallucination Rate | 17.8% | — |
Multimodal Muse Spark 1.3 leads
Grok 4.1 Fast: 37.0 (#76), Muse Spark 1.3: 43.7 (#22)
| Benchmark | Grok 4.1 Fast | Muse Spark 1.3 |
|---|---|---|
| LMArena Vision | 1201 | 1309 |
| LMArena Document | — | 1471 |
Multilingual Muse Spark 1.3 leads
Grok 4.1 Fast: 51.0 (#114), Muse Spark 1.3: 57.4 (#8)
| Benchmark | Grok 4.1 Fast | Muse Spark 1.3 |
|---|---|---|
| LMArena Non-English | 1391 | 1481 |
| LMArena Chinese | 1441 | 1529 |
| LMArena French | 1415 | 1524 |
| LMArena German | 1404 | 1515 |
| LMArena Japanese | 1349 | 1474 |
| LMArena Korean | 1361 | 1501 |
| LMArena Russian | 1387 | 1490 |
| LMArena Spanish | 1413 | 1490 |
Instruction Following Muse Spark 1.3 leads
Grok 4.1 Fast: 72.7 (#133), Muse Spark 1.3: 77.5 (#22)
| Benchmark | Grok 4.1 Fast | Muse Spark 1.3 |
|---|---|---|
| LMArena Instruction Following | 1376 | 1477 |
Long Context Muse Spark 1.3 leads
Grok 4.1 Fast: 42.4 (#126), Muse Spark 1.3: 45.6 (#32)
| Benchmark | Grok 4.1 Fast | Muse Spark 1.3 |
|---|---|---|
| LMArena Longer Query | 1390 | 1488 |
Writing & Preference Muse Spark 1.3 leads
Grok 4.1 Fast: 57.2 (#131), Muse Spark 1.3: 73.6 (#9)
| Benchmark | Grok 4.1 Fast | Muse Spark 1.3 |
|---|---|---|
| LMArena Text | 1408 | 1490 |
| LMArena Creative Writing | 1394 | 1455 |
| EQ-Bench Creative Writing | 1327 | 1906 |
| LMArena Multi-Turn | 1389 | 1482 |
Frequently asked questions
Is Grok 4.1 Fast better than Muse Spark 1.3?
Muse Spark 1.3 is the stronger model overall, scoring 54.8 to 41.4 on the Noometry Index. Grok 4.1 Fast costs 7.3× less per token, which makes it the better buy when Muse Spark 1.3's lead doesn't matter for your workload.
Which is cheaper, Grok 4.1 Fast or Muse Spark 1.3?
Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; Muse Spark 1.3 lists at $1.25 and $4.25.
Is Grok 4.1 Fast or Muse Spark 1.3 better for coding?
Muse Spark 1.3 scores higher on coding benchmarks: 56.6 versus 34.1 in the Noometry coding category.
Which has the bigger context window?
Muse Spark 1.3 does, with 1.05M tokens against 128K.
How many benchmarks do Grok 4.1 Fast and Muse Spark 1.3 share?
23 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Muse Spark 1.3 has 37.