# Grok 4.20 vs Muse Spark

> Side-by-side benchmark comparison for Grok 4.20 and Muse Spark across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/grok-4-20-beta-vs-muse-spark
- Last updated: October 5, 2026

- Shared sourced benchmarks: 19
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Muse Spark leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- Muse Spark has the higher overall point estimate 59.99 to 57.32. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in multimodal & grounded, where the averages are 35.6 for Grok 4.20 and 78.5 for Muse Spark.
- The biggest single benchmark swing is CharXiv in Multimodal & Grounded, with scores of 60.9% and 86.4%.
- Grok 4.20 also has the larger context window at 2M.

## Model Snapshot

| Property | Grok 4.20 | Muse Spark |
|----------|----------|----------|
| Creator | xAI | Meta |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 2M | 262K |
| Overall Score | 57.32 | 59.99 |
| Benchmarks Covered | 23 | 27 |
| Pricing (input/output) | $1.25 / $2.50 | N/A |

## Category Breakdown

### Agentic

- Winner: Muse Spark
- Grok 4.20 public-lane score: 24 (Supported · #94/119)
- Muse Spark public-lane score: 49.8 (Supported · #43/119)

| Benchmark | Grok 4.20 | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 47.1% | 59% | Muse Spark |
| DeepSearchQA | 62.8% | 74.8% | Muse Spark |
| Gert Labs | 38.36% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 44.2% | Coming soon | Coming soon |
| τ²-bench results | Coming soon | 91.5% | Coming soon |
| CyberGym | Coming soon | 43.5% | Coming soon |
| Claw-Eval | Coming soon | 63.8% | Coming soon |

### Coding

- Winner: Muse Spark
- Grok 4.20 public-lane score: 22.9 (Supported · #111/144)
- Muse Spark public-lane score: 51.1 (Supported · #39/144)

| Benchmark | Grok 4.20 | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench Pro | 74.2% | 80.0% | Muse Spark |
| SWE-bench Verified | 76.7% | 77.4% | Muse Spark |
| SWE-bench Pro | 51.8% | 52.4% | Muse Spark |
| Vibe Code Bench | 4.06% | 19.67% | Muse Spark |
| LiveCodeBench (Vals) | 84.3% | Coming soon | Coming soon |
| SWE-bench (Vals) | 72.2% | 74.4% | Muse Spark |

### Reasoning

- Winner: Not comparable
- Grok 4.20 public-lane score: 41.1 (Unranked · 2 rankable rows)
- Muse Spark public-lane score: 53.4 (Unranked · 3 rankable rows)

| Benchmark | Grok 4.20 | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 53.3% | 42.5% | Grok 4.20 |
| ARC-AGI-3 | 0.1% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Muse Spark
- Grok 4.20 public-lane score: 35.6 (#44/49)
- Muse Spark public-lane score: 78.5 (#14/49)

| Benchmark | Grok 4.20 | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 75.2% | 80.4% | Muse Spark |
| CharXiv | 60.9% | 86.4% | Muse Spark |
| ERQA | 54.1% | 64.7% | Muse Spark |
| SimpleVQA | 57.4% | 71.3% | Muse Spark |
| MedXpertQA (MM) | 65.8% | 78.4% | Muse Spark |
| ScreenSpot Pro | Coming soon | 84.1% | Coming soon |
| ZeroBench | Coming soon | 33.0% | Coming soon |

### Knowledge

- Winner: Muse Spark
- Grok 4.20 public-lane score: 50.4 (Supported · #64/171)
- Muse Spark public-lane score: 60.3 (Supported · #40/171)

| Benchmark | Grok 4.20 | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| GPQA-D | 88.5% | 89.5% | Muse Spark |
| HLE w/o tools | 31.6% | 42.8% | Muse Spark |
| HealthBench Hard | 20.3% | 42.8% | Muse Spark |
| MedXpertQA (Text) | 50.2% | 52.6% | Muse Spark |
| GPQA Diamond (Vals) | 88.6% | 89.6% | Muse Spark |
| MMLU-Pro (Vals) | 86.3% | 87.3% | Muse Spark |
| HLE | Coming soon | 50.4% | Coming soon |

### Instruction Following

- Winner: Not comparable
- Grok 4.20 public-lane score: Coming soon
- Muse Spark public-lane score: 91.9 (#8/125)

### Mathematics

- Winner: Not comparable
- Grok 4.20 public-lane score: Coming soon
- Muse Spark public-lane score: 55.1 (Unranked · 2 rankable rows)

| Benchmark | Grok 4.20 | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | Coming soon | 39.000% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 14.600% | Coming soon |

## FAQ

### Which is better overall, Grok 4.20 or Muse Spark?

Muse Spark has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between Grok 4.20 and Muse Spark?

The widest category gap is in multimodal & grounded, where the averages are 35.6 for Grok 4.20 and 78.5 for Muse Spark.

### How many benchmarks does Grok 4.20 cover on BenchLM?

Grok 4.20 currently has 23 sourced benchmark scores on BenchLM.

### How many benchmarks does Muse Spark cover on BenchLM?

Muse Spark currently has 27 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Grok 4.20 vs Grok 4.20 Multi-agent](/compare/grok-4-20-beta-vs-grok-4-20-multi-agent-beta)
- [Muse Spark vs Grok 4.20 Multi-agent](/compare/grok-4-20-multi-agent-beta-vs-muse-spark)
- [Grok 4.20 vs Muse Spark 1.2](/compare/grok-4-20-beta-vs-muse-spark-1-2)
- [Muse Spark vs Muse Spark 1.2](/compare/muse-spark-vs-muse-spark-1-2)

## Explore More

- [Grok 4.20 profile](/models/grok-4-20-beta)
- [Muse Spark profile](/models/muse-spark)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)