# GPT-5.6 Terra vs Muse Spark 1.3

> Side-by-side benchmark comparison for GPT-5.6 Terra and Muse Spark 1.3 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-6-terra-vs-muse-spark-1-3
- Last updated: October 17, 2026

- Shared sourced benchmarks: 10
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick Muse Spark 1.3 if you want the stronger benchmark profile. GPT-5.6 Terra only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Muse Spark 1.3 leads overall 73 to 70.21.
- The clearest category separation is in reasoning, where the averages are 69.1 for GPT-5.6 Terra and 82.9 for Muse Spark 1.3.
- The biggest single benchmark swing is FrontierMath v2 (Tier 4) in Mathematics, with scores of 68.300% and 46.341%.
- Muse Spark 1.3 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GPT-5.6 Terra also has the larger context window at 1.05M.

## Model Snapshot

| Property | GPT-5.6 Terra | Muse Spark 1.3 |
|----------|----------|----------|
| Creator | OpenAI | Meta |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1.05M | 1M |
| Overall Score | 70.21 | null |
| Benchmarks Covered | 35 | 20 |
| Pricing (input/output) | $2.00 / $12.00 | $1.25 / $4.25 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- GPT-5.6 Terra public-lane score: 60.4 (Supported · #26/128)
- Muse Spark 1.3 public-lane score: Coming soon

| Benchmark | GPT-5.6 Terra | Muse Spark 1.3 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 20.8% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 87.4% | 88.8% | Muse Spark 1.3 |
| BrowseComp | 87.5% | Coming soon | Coming soon |
| OSWorld 2.0 | 50.2% | 66.9% | Muse Spark 1.3 |
| CyberGym | 81.8% | Coming soon | Coming soon |
| ExploitGym | 23.2% | Coming soon | Coming soon |
| Toolathlon | 53.1% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 77.5% | 72.3% | GPT-5.6 Terra |
| ApprenticeBench | 16% | 19% | Muse Spark 1.3 |
| MazeBench | 6% | 0% | GPT-5.6 Terra |
| JobBench | Coming soon | 64.9% | Coming soon |
| DeepSearchQA | Coming soon | 89.4% | Coming soon |
| AutomationBench | Coming soon | 49.4% | Coming soon |
| CWE-bench v1 | Coming soon | 55.0% | Coming soon |

### Coding

- Winner: Not comparable
- GPT-5.6 Terra public-lane score: 61.9 (Supported · #15/150)
- Muse Spark 1.3 public-lane score: Coming soon

| Benchmark | GPT-5.6 Terra | Muse Spark 1.3 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Pro | 63.4% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 87.4% | 88.8% | Muse Spark 1.3 |
| DeepSWE | 69.6% | 75.4% | Muse Spark 1.3 |
| FrontierCode 1.1 Extended | 55.8% | Coming soon | Coming soon |
| CursorBench 3.2 | 64.9% | Coming soon | Coming soon |
| VulcanBench v3 | 87.0% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 85.9% | Coming soon | Coming soon |
| SWE-bench (Vals) | 95.4% | Coming soon | Coming soon |
| CursorBench 4.0 | 41.3% | 41.6% | Muse Spark 1.3 |
| SWE-Atlas Codebase QnA | Coming soon | 59.4% | Coming soon |
| Bug Hunt Bench | Coming soon | 32.2 fixes | Coming soon |
| FrontierSWE v2 | Coming soon | 25.8% | Coming soon |

### Reasoning

- Winner: Directional only
- GPT-5.6 Terra public-lane score: 69.1 (#22/28)
- Muse Spark 1.3 public-lane score: 82.9 (#6/28)

| Benchmark | GPT-5.6 Terra | Muse Spark 1.3 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 83.9% | Coming soon | Coming soon |
| ARC-AGI-3 | 0.8% | Coming soon | Coming soon |
| ARC-AGI-1 | 96.50% | Coming soon | Coming soon |
| MRCR v2 256K-512K | Coming soon | 98.5% | Coming soon |
| MRCR v2 512K-1M | Coming soon | 98.1% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- GPT-5.6 Terra public-lane score: 84.5 (#11/54)
- Muse Spark 1.3 public-lane score: Coming soon

| Benchmark | GPT-5.6 Terra | Muse Spark 1.3 | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 80.7% | Coming soon | Coming soon |
| MMMU-Pro w/ Python | 82% | Coming soon | Coming soon |

### Knowledge

- Winner: Not comparable
- GPT-5.6 Terra public-lane score: 70.2 (Supported · #17/184)
- Muse Spark 1.3 public-lane score: Coming soon

| Benchmark | GPT-5.6 Terra | Muse Spark 1.3 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 92.9% | Coming soon | Coming soon |
| GPQA-D | 92.9% | Coming soon | Coming soon |
| HLE-Verified | 51.1% | Coming soon | Coming soon |
| LABBench2 | 81.2% | Coming soon | Coming soon |
| HealthBench Professional | 57.7% | Coming soon | Coming soon |
| HealthBench Hard | 32.7% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 90.9% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 86.7% | Coming soon | Coming soon |

### Instruction Following

- Winner: Not comparable
- GPT-5.6 Terra public-lane score: 87.1 (#39/148)
- Muse Spark 1.3 public-lane score: Coming soon

| Benchmark | GPT-5.6 Terra | Muse Spark 1.3 | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | Coming soon | 15.9% | Coming soon |

### Mathematics

- Winner: Not comparable
- GPT-5.6 Terra public-lane score: 90.1 (Unranked · 3 rankable rows)
- Muse Spark 1.3 public-lane score: 78.5 (Unranked · 2 rankable rows)

| Benchmark | GPT-5.6 Terra | Muse Spark 1.3 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | 84.9% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 84.900% | 74.035% | GPT-5.6 Terra |
| FrontierMath v2 (Tier 4) | 68.300% | 46.341% | GPT-5.6 Terra |

## FAQ

### Which is better overall, GPT-5.6 Terra or Muse Spark 1.3?

Muse Spark 1.3 is ahead overall on BenchLM right now.

### Where is the biggest gap between GPT-5.6 Terra and Muse Spark 1.3?

The widest category gap is in reasoning, where the averages are 69.1 for GPT-5.6 Terra and 82.9 for Muse Spark 1.3.

### How many benchmarks does GPT-5.6 Terra cover on BenchLM?

GPT-5.6 Terra currently has 35 sourced benchmark scores on BenchLM.

### How many benchmarks does Muse Spark 1.3 cover on BenchLM?

Muse Spark 1.3 currently has 20 sourced benchmark scores on BenchLM.

## Related Comparisons

- [GPT-5.6 Terra vs GPT-5.6 Sol](/compare/gpt-5-6-sol-vs-gpt-5-6-terra)
- [Muse Spark 1.3 vs GPT-5.6 Sol](/compare/gpt-5-6-sol-vs-muse-spark-1-3)
- [GPT-5.6 Terra vs GPT-5.6 Luna](/compare/gpt-5-6-luna-vs-gpt-5-6-terra)
- [Muse Spark 1.3 vs GPT-5.6 Luna](/compare/gpt-5-6-luna-vs-muse-spark-1-3)

## Explore More

- [GPT-5.6 Terra profile](/models/gpt-5-6-terra)
- [Muse Spark 1.3 profile](/models/muse-spark-1-3)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)