# GPT-6 Luna vs GPT-6 Sol

> GPT-6 Sol is the stronger model overall, scoring 49.2 to 45.1 on the Noometry Index. GPT-6 Luna costs 20× less per token, which makes it the better buy when GPT-6 Sol's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-6-luna-vs-gpt-6-sol
- Last updated: 2026-10-10
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. GPT-6 Luna scores higher in 3 categories and GPT-6 Sol in 6 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-6 Sol leads 49.3 to 31.7.
- The biggest single-benchmark swing is NYT Connections (extended): 68.7% for GPT-6 Luna and 90.1% for GPT-6 Sol.
- GPT-6 Luna is cheaper at $0.10 / $0.50 per million input/output tokens, against $2 / $10 for GPT-6 Sol.

## Snapshot

| | GPT-6 Luna | GPT-6 Sol |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 45.1 | 49.2 |
| Rank | 65 | 46 |
| Context | 1.05M | 1.05M |
| Input $/M | $0.10 | $2 |
| Output $/M | $0.50 | $10 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-6 Luna: 54.7 (#24)
- GPT-6 Sol: 59.6 (#11)

| Benchmark | GPT-6 Luna | GPT-6 Sol |
|---|---|---|
| DeepSWE | 66.6% | 68.8% |
| FrontierCode | 42.4% | 49.3% |
| LMArena WebDev | 1583 | 1692 |
| LMArena Coding | 1448 | 1453 |

## Agentic & Tool Use

- GPT-6 Luna: —
- GPT-6 Sol: 33.5 (#49)

| Benchmark | GPT-6 Luna | GPT-6 Sol |
|---|---|---|
| GDP.pdf | — | 28% |

## Reasoning

- GPT-6 Luna: 31.7 (#68)
- GPT-6 Sol: 49.3 (#34)

| Benchmark | GPT-6 Luna | GPT-6 Sol |
|---|---|---|
| NYT Connections (extended) | 68.7% | 90.1% |
| LMArena Hard Prompts | 1415 | 1420 |
| EBR-Bench | — | 53.3% |

## Math

- GPT-6 Luna: 35.6 (#140)
- GPT-6 Sol: 35.8 (#135)

| Benchmark | GPT-6 Luna | GPT-6 Sol |
|---|---|---|
| LMArena Math | 1396 | 1404 |

## Knowledge

- GPT-6 Luna: 40.1 (#110)
- GPT-6 Sol: 43.0 (#87)

| Benchmark | GPT-6 Luna | GPT-6 Sol |
|---|---|---|
| LMArena Expert | 1458 | 1449 |
| Vectara Hallucination Rate | — | 6.5% |

## Multimodal

- GPT-6 Luna: 42.0 (#27)
- GPT-6 Sol: 47.6 (#9)

| Benchmark | GPT-6 Luna | GPT-6 Sol |
|---|---|---|
| Furniture Assembly | 44.2% | 58.3% |

## Multilingual

- GPT-6 Luna: 51.0 (#111)
- GPT-6 Sol: 51.0 (#113)

| Benchmark | GPT-6 Luna | GPT-6 Sol |
|---|---|---|
| LMArena Non-English | 1390 | 1389 |
| LMArena Chinese | 1425 | 1416 |
| LMArena Russian | 1392 | 1407 |
| LMArena Spanish | 1416 | 1377 |

## Instruction Following

- GPT-6 Luna: 74.7 (#85)
- GPT-6 Sol: 74.4 (#97)

| Benchmark | GPT-6 Luna | GPT-6 Sol |
|---|---|---|
| LMArena Instruction Following | 1414 | 1406 |

## Long Context

- GPT-6 Luna: 43.3 (#95)
- GPT-6 Sol: 43.2 (#100)

| Benchmark | GPT-6 Luna | GPT-6 Sol |
|---|---|---|
| LMArena Longer Query | 1417 | 1415 |

## Writing & Preference

- GPT-6 Luna: 58.4 (#115)
- GPT-6 Sol: 72.3 (#15)

| Benchmark | GPT-6 Luna | GPT-6 Sol |
|---|---|---|
| LMArena Text | 1392 | 1396 |
| LMArena Creative Writing | 1357 | 1392 |
| LMArena Multi-Turn | 1400 | 1405 |
| EQ-Bench Creative Writing | — | 2125 |

## FAQ

### Is GPT-6 Luna better than GPT-6 Sol?

GPT-6 Sol is the stronger model overall, scoring 49.2 to 45.1 on the Noometry Index. GPT-6 Luna costs 20× less per token, which makes it the better buy when GPT-6 Sol's lead doesn't matter for your workload.

### Which is cheaper, GPT-6 Luna or GPT-6 Sol?

GPT-6 Luna is cheaper. It lists at $0.10 per million input tokens and $0.50 per million output tokens; GPT-6 Sol lists at $2 and $10.

### Is GPT-6 Luna or GPT-6 Sol better for coding?

GPT-6 Sol scores higher on coding benchmarks: 59.6 versus 54.7 in the Noometry coding category.

### Which has the bigger context window?

Both accept 1.05M tokens.

### How many benchmarks do GPT-6 Luna and GPT-6 Sol share?

18 benchmarks have published results for both models. GPT-6 Luna has 18 scored results on Noometry and GPT-6 Sol has 22.