# GPT-6 Astra vs Muse Spark

> GPT-6 Astra is the stronger model overall, scoring 70.8 to 50.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-6-astra-vs-muse-spark
- Last updated: 2026-10-10
- Shared benchmarks: 25

## Summary

- They share 25 benchmarks with published results for both. GPT-6 Astra scores higher in 8 categories and Muse Spark in 1 category; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-6 Astra leads 85.1 to 35.9.
- The biggest single-benchmark swing is ProofBench: 99% for GPT-6 Astra and 17% for Muse Spark.

## Snapshot

| | GPT-6 Astra | Muse Spark |
|---|---|---|
| Provider | OpenAI | Meta |
| Noometry Index | 70.8 | 50.6 |
| Rank | 1 | 46 |
| Context | 1.05M | — |
| Input $/M | $10 | — |
| Output $/M | $50 | — |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-6 Astra: 73.7 (#2)
- Muse Spark: 46.2 (#69)

| Benchmark | GPT-6 Astra | Muse Spark |
|---|---|---|
| SciCode | 56.5% | 51.5% |
| LMArena Coding | 1487 | 1481 |
| DeepSWE | 74.1% | — |
| FrontierCode | 53.3% | — |
| LMArena WebDev | 1786 | — |
| FrontierSWE | 65.5% | — |
| GSO | 79.4% | — |
| WeirdML | 93.6% | — |
| MirrorCode | 46.7% | — |
| ALE-Bench | 2,951 | — |

## Agentic & Tool Use

- GPT-6 Astra: 52.9 (#3)
- Muse Spark: —

| Benchmark | GPT-6 Astra | Muse Spark |
|---|---|---|
| APEX-Agents | 64.7% | — |
| Remote Labor Index | 20.8% | — |
| BALROG | 68.3% | — |
| GDP.pdf | 34.2% | — |
| Vending-Bench 2 | 15,515 | — |

## Reasoning

- GPT-6 Astra: 85.1 (#1)
- Muse Spark: 35.9 (#67)

| Benchmark | GPT-6 Astra | Muse Spark |
|---|---|---|
| CritPt | 31.7% | 11.3% |
| LMArena Hard Prompts | 1462 | 1474 |
| Epoch Capabilities Index | 166.45 | 152.04 |
| ARC-AGI-2 | 95% | — |
| NYT Connections (extended) | 98.1% | — |
| ARC-AGI-1 | 98.5% | — |
| Chess Puzzles | 72% | — |
| EBR-Bench | 76.2% | — |
| Mystery Game Puzzles | 84% | — |
| DTBench | 97.3% | — |
| LMCA | 64.4% | — |
| Bench to the Future 3 | 0.14 | — |

## Math

- GPT-6 Astra: 93.5 (#2)
- Muse Spark: 47.8 (#66)

| Benchmark | GPT-6 Astra | Muse Spark |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 88.9% |
| ProofBench | 99% | 17% |
| LMArena Math | 1465 | 1455 |
| FrontierMath (Tiers 1-3) | 93.7% | — |
| FrontierMath Tier 4 | 97.6% | — |
| FrontierMath (Feb 2025 set) | — | 39% |
| FrontierMath Erdős | 2.9% | — |
| FrontierMath Tier 4 (v1) | — | 14.6% |

## Knowledge

- GPT-6 Astra: 75.3 (#1)
- Muse Spark: 65.7 (#13)

| Benchmark | GPT-6 Astra | Muse Spark |
|---|---|---|
| GPQA Diamond | 95.8% | 89.8% |
| Humanity's Last Exam | 54.8% | 40.6% |
| LMArena Expert | 1483 | 1457 |
| SimpleQA Verified | 75.6% | — |
| Vectara Hallucination Rate | 8.7% | — |

## Multimodal

- GPT-6 Astra: 55.0 (#3)
- Muse Spark: 43.4 (#24)

| Benchmark | GPT-6 Astra | Muse Spark |
|---|---|---|
| LMArena Vision | 1281 | 1306 |
| LMArena Document | 1468 | 1444 |
| Blueprint-Bench 2 | 49.7% | — |
| Furniture Assembly | 80% | — |

## Multilingual

- GPT-6 Astra: 53.7 (#61)
- Muse Spark: 56.1 (#24)

| Benchmark | GPT-6 Astra | Muse Spark |
|---|---|---|
| LMArena Non-English | 1430 | 1464 |
| LMArena Chinese | 1484 | 1509 |
| LMArena French | 1456 | 1497 |
| LMArena German | 1440 | 1497 |
| LMArena Korean | 1426 | 1459 |
| LMArena Russian | 1436 | 1466 |
| LMArena Spanish | 1407 | 1472 |
| LMArena Japanese | 1379 | — |

## Instruction Following

- GPT-6 Astra: 76.3 (#44)
- Muse Spark: 75.9 (#51)

| Benchmark | GPT-6 Astra | Muse Spark |
|---|---|---|
| LMArena Instruction Following | 1450 | 1442 |

## Long Context

- GPT-6 Astra: 44.5 (#62)
- Muse Spark: 44.4 (#69)

| Benchmark | GPT-6 Astra | Muse Spark |
|---|---|---|
| LMArena Longer Query | 1456 | 1451 |

## Writing & Preference

- GPT-6 Astra: 75.3 (#7)
- Muse Spark: 66.0 (#39)

| Benchmark | GPT-6 Astra | Muse Spark |
|---|---|---|
| LMArena Text | 1441 | 1474 |
| LMArena Creative Writing | 1418 | 1459 |
| LMArena Multi-Turn | 1448 | 1477 |
| EQ-Bench Creative Writing | 2173 | — |

## FAQ

### Is GPT-6 Astra better than Muse Spark?

GPT-6 Astra is the stronger model overall, scoring 70.8 to 50.6 on the Noometry Index.

### Is GPT-6 Astra or Muse Spark better for coding?

GPT-6 Astra scores higher on coding benchmarks: 73.7 versus 46.2 in the Noometry coding category.

### How many benchmarks do GPT-6 Astra and Muse Spark share?

25 benchmarks have published results for both models. GPT-6 Astra has 56 scored results on Noometry and Muse Spark has 27.