# GPT-5.6 Luna vs GPT-6 Sol

> Side-by-side benchmark comparison for GPT-5.6 Luna and GPT-6 Sol across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-6-luna-vs-gpt-6-sol
- Last updated: September 22, 2026

- Shared sourced benchmarks: 5
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick GPT-6 Sol if you want the stronger benchmark profile. GPT-5.6 Luna only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- GPT-6 Sol leads overall 80.45 to 62.23.
- The clearest category separation is in reasoning, where the averages are 50.8 for GPT-5.6 Luna and 78.5 for GPT-6 Sol.
- The biggest single benchmark swing is OSWorld 2.0 in Agentic, with scores of 45.6% and 60.5%.
- GPT-5.6 Luna is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | GPT-5.6 Luna | GPT-6 Sol |
|----------|----------|----------|
| Creator | OpenAI | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1.05M | 1.05M |
| Overall Score | 62.23 | 80.45 |
| Benchmarks Covered | 29 | 10 |
| Pricing (input/output) | $0.20 / $1.20 | $2.00 / $10.00 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- GPT-5.6 Luna public-lane score: 56.6 (Supported · #36/157)
- GPT-6 Sol public-lane score: 69.7 (Estimated · #7/157)

| Benchmark | GPT-5.6 Luna | GPT-6 Sol | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 14.3% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 84.7% | Coming soon | Coming soon |
| BrowseComp | 83.3% | Coming soon | Coming soon |
| OSWorld 2.0 | 45.6% | 60.5% | GPT-6 Sol |
| CyberGym | 77.9% | Coming soon | Coming soon |
| ExploitGym | 12.4% | 22.1% | GPT-6 Sol |
| Toolathlon | 53.4% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 79.0% | Coming soon | Coming soon |
| ApprenticeBench | 7% | Coming soon | Coming soon |
| Agents' Last Exam | Coming soon | 56.4% | Coming soon |
| AutomationBench | Coming soon | 33.2% | Coming soon |

### Coding

- Winner: Coming soon
- GPT-5.6 Luna public-lane score: 66.5 (Supported · #13/159)
- GPT-6 Sol public-lane score: 74.3 (Estimated · #6/159)

| Benchmark | GPT-5.6 Luna | GPT-6 Sol | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Pro | 62.7% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 84.7% | Coming soon | Coming soon |
| DeepSWE | 67.2% | 68.8% | GPT-6 Sol |
| FrontierCode 1.1 Extended | 55.1% | Coming soon | Coming soon |
| cursorBench32 | 61.1% | Coming soon | Coming soon |
| VulcanBench v3 | 85.5% | Coming soon | Coming soon |
| SWE-bench (Vals) | 93.0% | Coming soon | Coming soon |

### Reasoning

- Winner: Coming soon
- GPT-5.6 Luna public-lane score: 50.8 (#16/17)
- GPT-6 Sol public-lane score: 78.5 (#5/17)

| Benchmark | GPT-5.6 Luna | GPT-6 Sol | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 59.5% | Coming soon | Coming soon |
| ARC-AGI-3 | 0.2% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- GPT-5.6 Luna public-lane score: 67.1 (#22/50)
- GPT-6 Sol public-lane score: 82.8 (Unranked · 1 rankable row)

| Benchmark | GPT-5.6 Luna | GPT-6 Sol | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 78.4% | Coming soon | Coming soon |
| MMMU-Pro w/ Python | 79.5% | Coming soon | Coming soon |

### Knowledge

- Winner: Coming soon
- GPT-5.6 Luna public-lane score: 63.5 (Supported · #30/189)
- GPT-6 Sol public-lane score: 80.2 (Estimated · #6/189)

| Benchmark | GPT-5.6 Luna | GPT-6 Sol | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 92.3% | Coming soon | Coming soon |
| GPQA-D | 92.3% | Coming soon | Coming soon |
| HealthBench Professional | 55.7% | 60.8% | GPT-6 Sol |
| HealthBench Hard | 32.0% | 30.1% | GPT-5.6 Luna |
| GPQA Diamond (Vals) | 91.7% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 86.0% | Coming soon | Coming soon |
| HealthBench (raw) | Coming soon | 47.1% | Coming soon |
| HealthBench (length-adjusted) | Coming soon | 53.2% | Coming soon |
| HealthBench Professional (raw) | Coming soon | 59.5% | Coming soon |

### Mathematics

- Winner: Coming soon
- GPT-5.6 Luna public-lane score: 94.2 (Unranked · 3 rankable rows)
- GPT-6 Sol public-lane score: Coming soon

| Benchmark | GPT-5.6 Luna | GPT-6 Sol | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | 78.6% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 78.600% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 58.500% | Coming soon | Coming soon |

## FAQ

### Which is better overall, GPT-5.6 Luna or GPT-6 Sol?

GPT-6 Sol is ahead overall on BenchLM right now.

### Where is the biggest gap between GPT-5.6 Luna and GPT-6 Sol?

The widest category gap is in reasoning, where the averages are 50.8 for GPT-5.6 Luna and 78.5 for GPT-6 Sol.

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

GPT-5.6 Luna currently has 29 sourced benchmark scores on BenchLM.

### How many benchmarks does GPT-6 Sol cover on BenchLM?

GPT-6 Sol currently has 10 sourced benchmark scores on BenchLM.

## Related Comparisons

- [GPT-5.6 Luna vs GPT-5.6 Sol](/compare/gpt-5-6-luna-vs-gpt-5-6-sol)
- [GPT-6 Sol vs GPT-5.6 Sol](/compare/gpt-5-6-sol-vs-gpt-6-sol)
- [GPT-5.6 Luna vs GPT-5.6 Terra](/compare/gpt-5-6-luna-vs-gpt-5-6-terra)
- [GPT-6 Sol vs GPT-5.6 Terra](/compare/gpt-5-6-terra-vs-gpt-6-sol)

## Explore More

- [GPT-5.6 Luna profile](/models/gpt-5-6-luna)
- [GPT-6 Sol profile](/models/gpt-6-sol)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)