Model comparison
Grok 4.1 Fast vs Muse Spark 1.2
Muse Spark 1.2 is the stronger model overall, scoring 49.8 to 40.9 on the Noometry Index. Grok 4.1 Fast costs 7.3× less per token, which makes it the better buy when Muse Spark 1.2's lead doesn't matter for your workload.
Last verified . 18 shared benchmarks.
MetaSummary
- They share 18 benchmarks with published results for both. Grok 4.1 Fast scores higher in 1 category and Muse Spark 1.2 in 9 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Muse Spark 1.2 leads 53.9 to 32.6.
- The biggest single-benchmark swing is ProofBench: 4% for Grok 4.1 Fast and 43% for Muse Spark 1.2.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $1.25 / $4.25 for Muse Spark 1.2.
- Muse Spark 1.2 accepts more context: 1.05M tokens versus 128K.
Side by side
| Grok 4.1 Fast | Muse Spark 1.2 | |
|---|---|---|
| Provider | xAI | Meta |
| Noometry Index | 40.9 | 49.8 |
| Released | 2025-06-27 | 2026-08-05 |
| 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 | 28 |
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Category by category
Coding Muse Spark 1.2 leads
Grok 4.1 Fast: 33.8 (#236), Muse Spark 1.2: 48.6 (#49)
| Benchmark | Grok 4.1 Fast | Muse Spark 1.2 |
|---|---|---|
| LMArena WebDev | 1241 | 1532 |
| LMArena Coding | 1411 | 1497 |
| DeepSWE | — | 54.9% |
| FrontierSWE | — | 12% |
| SciCode | — | 56.4% |
| WeirdML | — | 60.3% |
| ALE-Bench | 394.93 | — |
Agentic & Tool Use Grok 4.1 Fast leads
Grok 4.1 Fast: 36.1 (#35), Muse Spark 1.2: 29.5 (#77)
| Benchmark | Grok 4.1 Fast | Muse Spark 1.2 |
|---|---|---|
| APEX-Agents | — | 36.4% |
| Berkeley Function Calling Leaderboard | 69.6% | — |
| τ²-bench Banking | 13.1% | — |
| GDP.pdf | — | 16% |
| LMArena Search | 1171 | — |
| Vending-Bench 2 | 1,107 | — |
Reasoning Muse Spark 1.2 leads
Grok 4.1 Fast: 42.3 (#45), Muse Spark 1.2: 50.4 (#32)
| Benchmark | Grok 4.1 Fast | Muse Spark 1.2 |
|---|---|---|
| SimpleBench | 56% | 74.5% |
| NYT Connections (extended) | 87.4% | 79.2% |
| LMArena Hard Prompts | 1407 | 1490 |
| DTBench | 87.7% | 94.7% |
| CritPt | — | 17.7% |
| LMCA | — | 48.4% |
| Epoch Capabilities Index | — | 155.18 |
| ForecastBench | 61 | — |
Math Muse Spark 1.2 leads
Grok 4.1 Fast: 30.9 (#201), Muse Spark 1.2: 43.8 (#68)
| Benchmark | Grok 4.1 Fast | Muse Spark 1.2 |
|---|---|---|
| ProofBench | 4% | 43% |
| MathArena Final-Answer Competitions | 60.9% | — |
| LMArena Math | 1408 | — |
Knowledge Muse Spark 1.2 leads
Grok 4.1 Fast: 32.6 (#203), Muse Spark 1.2: 53.9 (#49)
| Benchmark | Grok 4.1 Fast | Muse Spark 1.2 |
|---|---|---|
| LMArena Expert | 1398 | 1485 |
| SimpleQA Verified | — | 60.3% |
| Vectara Hallucination Rate | 17.8% | — |
Multimodal Muse Spark 1.2 leads
Grok 4.1 Fast: 36.3 (#71), Muse Spark 1.2: 42.6 (#24)
| Benchmark | Grok 4.1 Fast | Muse Spark 1.2 |
|---|---|---|
| LMArena Vision | 1201 | 1304 |
Multilingual Muse Spark 1.2 leads
Grok 4.1 Fast: 51.1 (#110), Muse Spark 1.2: 57.4 (#10)
| Benchmark | Grok 4.1 Fast | Muse Spark 1.2 |
|---|---|---|
| LMArena Non-English | 1391 | 1479 |
| LMArena Chinese | 1441 | 1519 |
| LMArena Russian | 1387 | 1494 |
| LMArena French | 1416 | — |
| LMArena German | 1404 | — |
| LMArena Japanese | 1347 | — |
| LMArena Korean | 1361 | — |
| LMArena Spanish | 1411 | — |
Instruction Following Muse Spark 1.2 leads
Grok 4.1 Fast: 72.8 (#127), Muse Spark 1.2: 77.1 (#30)
| Benchmark | Grok 4.1 Fast | Muse Spark 1.2 |
|---|---|---|
| LMArena Instruction Following | 1376 | 1466 |
Long Context Muse Spark 1.2 leads
Grok 4.1 Fast: 42.4 (#121), Muse Spark 1.2: 45.4 (#35)
| Benchmark | Grok 4.1 Fast | Muse Spark 1.2 |
|---|---|---|
| LMArena Longer Query | 1390 | 1483 |
Writing & Preference Muse Spark 1.2 leads
Grok 4.1 Fast: 57.4 (#126), Muse Spark 1.2: 72.6 (#14)
| Benchmark | Grok 4.1 Fast | Muse Spark 1.2 |
|---|---|---|
| LMArena Text | 1408 | 1486 |
| LMArena Creative Writing | 1394 | 1444 |
| EQ-Bench Creative Writing | 1327 | 1840 |
| LMArena Multi-Turn | 1389 | 1504 |
Frequently asked questions
Is Grok 4.1 Fast better than Muse Spark 1.2?
Muse Spark 1.2 is the stronger model overall, scoring 49.8 to 40.9 on the Noometry Index. Grok 4.1 Fast costs 7.3× less per token, which makes it the better buy when Muse Spark 1.2's lead doesn't matter for your workload.
Which is cheaper, Grok 4.1 Fast or Muse Spark 1.2?
Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; Muse Spark 1.2 lists at $1.25 and $4.25.
Is Grok 4.1 Fast or Muse Spark 1.2 better for coding?
Muse Spark 1.2 scores higher on coding benchmarks: 48.6 versus 33.8 in the Noometry coding category.
Which has the bigger context window?
Muse Spark 1.2 does, with 1.05M tokens against 128K.
How many benchmarks do Grok 4.1 Fast and Muse Spark 1.2 share?
18 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Muse Spark 1.2 has 28.