# GPT-6.1 Terra vs Muse Spark

> Side-by-side benchmark comparison for GPT-6.1 Terra and Muse Spark across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-6-1-terra-vs-muse-spark
- Last updated: October 26, 2026

- Shared sourced benchmarks: 2
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: GPT-6.1 Terra and Muse Spark share only 2 sourced benchmark rows.

## Summary

- Only 2 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- GPT-6.1 Terra has the larger published context window at 1.05M.

## Model Snapshot

| Property | GPT-6.1 Terra | Muse Spark |
|----------|----------|----------|
| Creator | OpenAI | Meta |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1.05M | 262K |
| Independent public score (not head-to-head) | 75.87 | 60.67 |
| Benchmarks Covered | 10 | 25 |
| Pricing (input/output) | $1.00 / $5.00 | N/A |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-6.1 Terra public-lane score: 72.4 (Estimated · #8/133)
- Muse Spark public-lane score: 52.3 (Supported · #48/133)

| Benchmark | GPT-6.1 Terra | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 4.0 | 50.30% | Coming soon | Coming soon |
| Terminal-Bench-Science 0.1 | 58.3% | Coming soon | Coming soon |
| Agents' Last Exam | 60.0% | Coming soon | Coming soon |
| OSWorld 2.1 Offline | 74.2% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 59% | Coming soon |
| τ²-bench results | Coming soon | 91.5% | Coming soon |
| DeepSearchQA | Coming soon | 74.8% | Coming soon |
| CyberGym | Coming soon | 43.5% | Coming soon |
| Claw-Eval | Coming soon | 63.8% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-6.1 Terra public-lane score: Coming soon
- Muse Spark public-lane score: 50.3 (Supported · #46/154)

| Benchmark | GPT-6.1 Terra | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | Coming soon | 77.4% | Coming soon |
| SWE-bench Pro | Coming soon | 52.4% | Coming soon |
| LiveCodeBench Pro | Coming soon | 80.0% | Coming soon |
| Vibe Code Bench | Coming soon | 19.67% | Coming soon |
| SWE-bench (Vals) | Coming soon | 74.4% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-6.1 Terra public-lane score: 81.8 (Unranked · 2 rankable rows)
- Muse Spark public-lane score: 57.1 (Unranked · 3 rankable rows)

| Benchmark | GPT-6.1 Terra | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | Coming soon | 42.5% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-6.1 Terra public-lane score: 91.6 (#4/58)
- Muse Spark public-lane score: 83.8 (#15/58)

| Benchmark | GPT-6.1 Terra | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 85.5% | 80.4% | GPT-6.1 Terra |
| CharXiv | Coming soon | 86.4% | Coming soon |
| ERQA | Coming soon | 64.7% | Coming soon |
| SimpleVQA | Coming soon | 71.3% | Coming soon |
| ScreenSpot Pro | Coming soon | 84.1% | Coming soon |
| ZeroBench | Coming soon | 33.0% | Coming soon |
| MedXpertQA (MM) | Coming soon | 78.4% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- GPT-6.1 Terra public-lane score: 74.9 (Supported · #12/188)
- Muse Spark public-lane score: 62 (Supported · #45/188)

| Benchmark | GPT-6.1 Terra | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| HealthBench (raw) | 51.1% | Coming soon | Coming soon |
| HealthBench (length-adjusted) | 55.1% | Coming soon | Coming soon |
| HealthBench Professional | 62.7% | Coming soon | Coming soon |
| HealthBench Professional (raw) | 64.2% | Coming soon | Coming soon |
| HealthBench Hard | 31.4% | 42.8% | Muse Spark |
| GPQA-D | Coming soon | 89.5% | Coming soon |
| HLE | Coming soon | 50.4% | Coming soon |
| HLE w/o tools | Coming soon | 42.8% | Coming soon |
| MedXpertQA (Text) | Coming soon | 52.6% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 89.6% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 87.3% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-6.1 Terra public-lane score: Coming soon
- Muse Spark public-lane score: 93.3 (#11/155)

## FAQ

### Is there enough evidence to pick between GPT-6.1 Terra and Muse Spark?

Not yet. The models share only 2 sourced benchmark rows, 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-6.1 Terra vs GPT-6 Astra](/compare/gpt-6-1-terra-vs-gpt-6-astra)
- [Muse Spark vs GPT-6 Astra](/compare/gpt-6-astra-vs-muse-spark)
- [GPT-6.1 Terra vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-gpt-6-1-terra)
- [Muse Spark vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-muse-spark)

## Explore More

- [GPT-6.1 Terra profile](/models/gpt-6-1-terra)
- [Muse Spark profile](/models/muse-spark)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)