# GPT-6.1 Sol vs GPT-6 Luna

> Side-by-side benchmark comparison for GPT-6.1 Sol and GPT-6 Luna across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-6-1-sol-vs-gpt-6-luna
- Last updated: September 29, 2026

- Shared sourced benchmarks: 7
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick GPT-6.1 Sol if you want the stronger benchmark profile. GPT-6 Luna only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- GPT-6.1 Sol leads overall 66.86 to 66.07.
- The clearest category separation is in reasoning, where the averages are 79.4 for GPT-6.1 Sol and 55.6 for GPT-6 Luna.
- The biggest single benchmark swing is ExploitGym in Agentic, with scores of 35.1% and 11.6%.
- GPT-6 Luna is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | GPT-6.1 Sol | GPT-6 Luna |
|----------|----------|----------|
| Creator | OpenAI | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1.05M | 1.05M |
| Overall Score | 66.86 | 66.07 |
| Benchmarks Covered | 9 | 10 |
| Pricing (input/output) | $2.00 / $10.00 | $0.10 / $0.50 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- GPT-6.1 Sol public-lane score: Coming soon
- GPT-6 Luna public-lane score: 55.5 (Estimated · #32/117)

| Benchmark | GPT-6.1 Sol | GPT-6 Luna | Winner |
|-----------|-----------|-----------|--------|
| AutomationBench | 36.1% | Coming soon | Coming soon |
| Terminal-Bench-Science 0.1 | 57.0% | Coming soon | Coming soon |
| ExploitGym | 35.1% | 11.6% | GPT-6.1 Sol |

### Coding

- Winner: GPT-6.1 Sol
- GPT-6.1 Sol public-lane score: 67 (Supported · #8/143)
- GPT-6 Luna public-lane score: 51.4 (Supported · #38/143)

| Benchmark | GPT-6.1 Sol | GPT-6 Luna | Winner |
|-----------|-----------|-----------|--------|
| DeepSWE | 71.9% | 66.6% | GPT-6.1 Sol |

### Reasoning

- Winner: Not comparable
- GPT-6.1 Sol public-lane score: 79.4 (Unranked · 2 rankable rows)
- GPT-6 Luna public-lane score: 55.6 (#25/27)

| Benchmark | GPT-6.1 Sol | GPT-6 Luna | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | Coming soon | 86.70% | Coming soon |
| ARC-AGI-2 | Coming soon | 59.3% | Coming soon |
| ARC-AGI-3 | Coming soon | 0.1% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- GPT-6.1 Sol public-lane score: 83.9 (Unranked · 1 rankable row)
- GPT-6 Luna public-lane score: 72.3 (Unranked · 1 rankable row)

### Knowledge

- Winner: Directional only
- GPT-6.1 Sol public-lane score: 71.3 (Estimated · #10/169)
- GPT-6 Luna public-lane score: 65 (Supported · #24/169)

| Benchmark | GPT-6.1 Sol | GPT-6 Luna | Winner |
|-----------|-----------|-----------|--------|
| HealthBench (raw) | 56.7% | 50.0% | GPT-6.1 Sol |
| HealthBench (length-adjusted) | 58.5% | 54.5% | GPT-6.1 Sol |
| HealthBench Professional | 64.2% | 60.8% | GPT-6.1 Sol |
| HealthBench Professional (raw) | 67.2% | 61.2% | GPT-6.1 Sol |
| HealthBench Hard | 36.2% | 31.4% | GPT-6.1 Sol |

## FAQ

### Which is better overall, GPT-6.1 Sol or GPT-6 Luna?

GPT-6.1 Sol is ahead overall on BenchLM right now.

### Where is the biggest gap between GPT-6.1 Sol and GPT-6 Luna?

The widest category gap is in reasoning, where the averages are 79.4 for GPT-6.1 Sol and 55.6 for GPT-6 Luna.

### How many benchmarks does GPT-6.1 Sol cover on BenchLM?

GPT-6.1 Sol currently has 9 sourced benchmark scores on BenchLM.

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

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

## Related Comparisons

- [GPT-6.1 Sol vs GPT-6 Astra](/compare/gpt-6-1-sol-vs-gpt-6-astra)
- [GPT-6 Luna vs GPT-6 Astra](/compare/gpt-6-astra-vs-gpt-6-luna)
- [GPT-6.1 Sol vs GPT-6 Sol](/compare/gpt-6-1-sol-vs-gpt-6-sol)
- [GPT-6 Luna vs GPT-6 Sol](/compare/gpt-6-luna-vs-gpt-6-sol)

## Explore More

- [GPT-6.1 Sol profile](/models/gpt-6-1-sol)
- [GPT-6 Luna profile](/models/gpt-6-luna)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)