Model comparison
Grok 4.20 Multi-Agent vs Muse Spark 1.3
Muse Spark 1.3 is the stronger model overall, scoring 54.4 to 45.5 on the Noometry Index.
Last verified . 17 shared benchmarks.
MetaSummary
- They share 17 benchmarks with published results for both. Grok 4.20 Multi-Agent scores higher in 0 categories and Muse Spark 1.3 in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Muse Spark 1.3 leads 72.4 to 36.6.
- Grok 4.20 Multi-Agent 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 4.20 Multi-Agent | Muse Spark 1.3 | |
|---|---|---|
| Provider | xAI | Meta |
| Noometry Index | 45.5 | 54.4 |
| Released | 2026-03-09 | 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 | 20 | 34 |
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Category by category
Coding Muse Spark 1.3 leads
Grok 4.20 Multi-Agent: 42.4 (#91), Muse Spark 1.3: 56.1 (#18)
| Benchmark | Grok 4.20 Multi-Agent | Muse Spark 1.3 |
|---|---|---|
| LMArena Coding | 1458 | 1516 |
| CursorBench | — | 41.6% |
| LMArena WebDev | — | 1655 |
| SciCode | — | 59.7% |
Agentic & Tool Use Not comparable
Grok 4.20 Multi-Agent: —, Muse Spark 1.3: 38.6 (#28)
| Benchmark | Grok 4.20 Multi-Agent | Muse Spark 1.3 |
|---|---|---|
| APEX-Agents | — | 57.8% |
| GDP.pdf | — | 27.6% |
| LMArena Search | 1204 | — |
Reasoning Muse Spark 1.3 leads
Grok 4.20 Multi-Agent: 42.4 (#44), Muse Spark 1.3: 52.9 (#27)
| Benchmark | Grok 4.20 Multi-Agent | Muse Spark 1.3 |
|---|---|---|
| NYT Connections (extended) | 89.6% | 85.1% |
| LMArena Hard Prompts | 1448 | 1503 |
| CritPt | — | 24.9% |
| Chess Puzzles | — | 38% |
| Mystery Game Puzzles | — | 25% |
| DTBench | — | 96.5% |
| LMCA | — | 53.9% |
| Bench to the Future 3 | — | 0.14 |
| Epoch Capabilities Index | — | 156.89 |
Math Muse Spark 1.3 leads
Grok 4.20 Multi-Agent: 36.6 (#106), Muse Spark 1.3: 72.4 (#16)
| Benchmark | Grok 4.20 Multi-Agent | Muse Spark 1.3 |
|---|---|---|
| LMArena Math | 1441 | 1497 |
| FrontierMath (Tiers 1-3) | — | 74.4% |
| FrontierMath Tier 4 | — | 46.3% |
| OTIS Mock AIME 2024-2025 | — | 99.2% |
Knowledge Muse Spark 1.3 leads
Grok 4.20 Multi-Agent: 39.7 (#116), Muse Spark 1.3: 42.0 (#92)
| Benchmark | Grok 4.20 Multi-Agent | Muse Spark 1.3 |
|---|---|---|
| LMArena Expert | 1445 | 1516 |
Multimodal Muse Spark 1.3 leads
Grok 4.20 Multi-Agent: 39.8 (#44), Muse Spark 1.3: 43.0 (#21)
| Benchmark | Grok 4.20 Multi-Agent | Muse Spark 1.3 |
|---|---|---|
| LMArena Vision | 1259 | 1310 |
| LMArena Document | — | 1471 |
Multilingual Muse Spark 1.3 leads
Grok 4.20 Multi-Agent: 54.6 (#40), Muse Spark 1.3: 57.8 (#6)
| Benchmark | Grok 4.20 Multi-Agent | Muse Spark 1.3 |
|---|---|---|
| LMArena Non-English | 1440 | 1485 |
| LMArena Chinese | 1475 | 1527 |
| LMArena French | 1467 | 1534 |
| LMArena Korean | 1416 | 1513 |
| LMArena Russian | 1457 | 1491 |
| LMArena Spanish | 1447 | 1485 |
| LMArena German | 1456 | — |
| LMArena Japanese | 1405 | — |
Instruction Following Muse Spark 1.3 leads
Grok 4.20 Multi-Agent: 75.0 (#80), Muse Spark 1.3: 77.8 (#14)
| Benchmark | Grok 4.20 Multi-Agent | Muse Spark 1.3 |
|---|---|---|
| LMArena Instruction Following | 1420 | 1481 |
Long Context Muse Spark 1.3 leads
Grok 4.20 Multi-Agent: 43.7 (#84), Muse Spark 1.3: 45.7 (#29)
| Benchmark | Grok 4.20 Multi-Agent | Muse Spark 1.3 |
|---|---|---|
| LMArena Longer Query | 1430 | 1491 |
Writing & Preference Muse Spark 1.3 leads
Grok 4.20 Multi-Agent: 64.1 (#57), Muse Spark 1.3: 73.7 (#10)
| Benchmark | Grok 4.20 Multi-Agent | Muse Spark 1.3 |
|---|---|---|
| LMArena Text | 1450 | 1490 |
| LMArena Creative Writing | 1435 | 1450 |
| LMArena Multi-Turn | 1451 | 1486 |
| EQ-Bench Creative Writing | — | 1906 |
Frequently asked questions
Is Grok 4.20 Multi-Agent better than Muse Spark 1.3?
Muse Spark 1.3 is the stronger model overall, scoring 54.4 to 45.5 on the Noometry Index.
Which is cheaper, Grok 4.20 Multi-Agent or Muse Spark 1.3?
Grok 4.20 Multi-Agent 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 4.20 Multi-Agent or Muse Spark 1.3 better for coding?
Muse Spark 1.3 scores higher on coding benchmarks: 56.1 versus 42.4 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 4.20 Multi-Agent and Muse Spark 1.3 share?
17 benchmarks have published results for both models. Grok 4.20 Multi-Agent has 20 scored results on Noometry and Muse Spark 1.3 has 34.