# GPT-6 Astra vs Muse Spark Open

> Side-by-side benchmark comparison for GPT-6 Astra and Muse Spark Open across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-6-astra-vs-muse-spark-open
- Last updated: October 15, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: GPT-6 Astra and Muse Spark Open share only 1 sourced benchmark row.

## Summary

- Only 1 shared sourced benchmark row is available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Muse Spark Open has the lower published output-token price.
- GPT-6 Astra has the larger published context window at 1.05M.

## Model Snapshot

| Property | GPT-6 Astra | Muse Spark Open |
|----------|----------|----------|
| Creator | OpenAI | Meta |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1.05M | 1M |
| Independent public score (not head-to-head) | 83.86 | 62.66 |
| Benchmarks Covered | 39 | 7 |
| Pricing (input/output) | $10.00 / $50.00 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-6 Astra public-lane score: 74.9 (Supported · #7/127)
- Muse Spark Open public-lane score: 60.2 (Estimated · #27/127)

| Benchmark | GPT-6 Astra | Muse Spark Open | Winner |
|-----------|-----------|-----------|--------|
| BrowseComp | 91.5% | Coming soon | Coming soon |
| OSWorld 2.0 | 72.6% | Coming soon | Coming soon |
| Terminal-Bench 4.0 | 57.90% | Coming soon | Coming soon |
| Terminal-Bench-Science 0.1 | 64.6% | Coming soon | Coming soon |
| ExploitGym | 42.4% | Coming soon | Coming soon |
| Agents' Last Exam | 59.3% | Coming soon | Coming soon |
| AutomationBench | 41.4% | Coming soon | Coming soon |
| HLE w/ tools | 57.2% | 61.0% | Muse Spark Open |
| Terminal-Bench 2.1 (Vals) | 87.3% | Coming soon | Coming soon |
| ApprenticeBench | 68% | Coming soon | Coming soon |
| CWE-bench v1 | 68.0% | Coming soon | Coming soon |
| Hermes Index | 56.3% | Coming soon | Coming soon |
| Hermes Bench | 73.7% | Coming soon | Coming soon |
| MazeBench | 23% | Coming soon | Coming soon |
| JobBench | Coming soon | 61.8% | Coming soon |
| MCP Atlas | Coming soon | 89.2% | Coming soon |
| Toolathlon-Verified | Coming soon | 72.8% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-6 Astra public-lane score: 75.4 (Supported · #4/150)
- Muse Spark Open public-lane score: 56.1 (Supported · #29/150)

| Benchmark | GPT-6 Astra | Muse Spark Open | Winner |
|-----------|-----------|-----------|--------|
| DeepSWE | 74.1% | Coming soon | Coming soon |
| FrontierCode 1.1 Main | 53.3% | Coming soon | Coming soon |
| FrontierCode 1.1 Extended | 64.5% | Coming soon | Coming soon |
| FrontierSWE v2 | 65.5% | Coming soon | Coming soon |
| PostTrainBench v1.1 | 44.3% | Coming soon | Coming soon |
| Bug Hunt Bench | 45.0 fixes | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-6 Astra public-lane score: 93.3 (#1/28)
- Muse Spark Open public-lane score: 79.6 (Unranked · 2 rankable rows)

| Benchmark | GPT-6 Astra | Muse Spark Open | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | 98.50% | Coming soon | Coming soon |
| ARC-AGI-2 | 95% | Coming soon | Coming soon |
| ARC-AGI-3 | 62.7% | Coming soon | Coming soon |
| GeneBench-Pro | 37.8% | Coming soon | Coming soon |
| MRCR v2 256K-512K | 100.0% | Coming soon | Coming soon |
| MRCR v2 512K-1M | 96.3% | Coming soon | Coming soon |
| GraphWalks BFS 256K–1M | 71.8% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-6 Astra public-lane score: 87.3 (Unranked · 3 rankable rows)
- Muse Spark Open public-lane score: 83.6 (Unranked · 4 rankable rows)

| Benchmark | GPT-6 Astra | Muse Spark Open | Winner |
|-----------|-----------|-----------|--------|
| ScreenSpot Pro | 92.7% | Coming soon | Coming soon |
| BenchCAD Vision2Code (tools) | 0.959 | Coming soon | Coming soon |
| ZeroBench | Coming soon | 50.0% | Coming soon |
| BabyVision | Coming soon | 80.2% | Coming soon |
| SimpleVQA | Coming soon | 73.6% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- GPT-6 Astra public-lane score: 85.9 (Supported · #3/184)
- Muse Spark Open public-lane score: 64.6 (Supported · #38/184)

| Benchmark | GPT-6 Astra | Muse Spark Open | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 96% | Coming soon | Coming soon |
| GPQA-D | 96.0% | Coming soon | Coming soon |
| HealthBench (raw) | 56.9% | Coming soon | Coming soon |
| HealthBench (length-adjusted) | 58.3% | Coming soon | Coming soon |
| HealthBench Professional | 64.7% | Coming soon | Coming soon |
| HealthBench Professional (raw) | 68.2% | Coming soon | Coming soon |
| HealthBench Hard | 36.6% | Coming soon | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-6 Astra public-lane score: Coming soon
- Muse Spark Open public-lane score: Coming soon

| Benchmark | GPT-6 Astra | Muse Spark Open | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | 8.5% | Coming soon | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- GPT-6 Astra public-lane score: 97.3 (Unranked · 2 rankable rows)
- Muse Spark Open public-lane score: Coming soon

| Benchmark | GPT-6 Astra | Muse Spark Open | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tier 4) | 97.600% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 93.684% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between GPT-6 Astra and Muse Spark Open?

Not yet. The models share only 1 sourced benchmark row, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [GPT-6 Astra vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-gpt-6-astra)
- [Muse Spark Open vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-muse-spark-open)
- [GPT-6 Astra vs GPT-6 Sol](/compare/gpt-6-astra-vs-gpt-6-sol)
- [Muse Spark Open vs GPT-6 Sol](/compare/gpt-6-sol-vs-muse-spark-open)

## Explore More

- [GPT-6 Astra profile](/models/gpt-6-astra)
- [Muse Spark Open profile](/models/muse-spark-open)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)