# GPT-5.6 Sol vs GPT-6 Sol

> GPT-5.6 Sol is the stronger model overall, scoring 64.4 to 49.2 on the Noometry Index. GPT-6 Sol costs 2.0× less per token, which makes it the better buy when GPT-5.6 Sol's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-5-6-sol-vs-gpt-6-sol
- Last updated: 2026-10-10
- Shared benchmarks: 22

## Summary

- They share 22 benchmarks with published results for both. GPT-5.6 Sol scores higher in 10 categories and GPT-6 Sol in 0 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.6 Sol leads 85.5 to 35.8.
- The biggest single-benchmark swing is EBR-Bench: 44.8% for GPT-5.6 Sol and 53.3% for GPT-6 Sol.
- GPT-6 Sol is cheaper at $2 / $10 per million input/output tokens, against $4 / $20 for GPT-5.6 Sol.

## Snapshot

| | GPT-5.6 Sol | GPT-6 Sol |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 64.4 | 49.2 |
| Rank | 6 | 46 |
| Context | 1.05M | 1.05M |
| Input $/M | $4 | $2 |
| Output $/M | $20 | $10 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.6 Sol: 61.1 (#7)
- GPT-6 Sol: 59.6 (#11)

| Benchmark | GPT-5.6 Sol | GPT-6 Sol |
|---|---|---|
| DeepSWE | 72.7% | 68.8% |
| FrontierCode | 47.5% | 49.3% |
| LMArena WebDev | 1619 | 1692 |
| LMArena Coding | 1493 | 1453 |
| CursorBench | 41.7% | — |
| FrontierSWE | 32.2% | — |
| SciCode | 57.1% | — |
| WeirdML | 89.4% | — |
| MirrorCode | 20% | — |
| ALE-Bench | 2,177 | — |

## Agentic & Tool Use

- GPT-5.6 Sol: 50.2 (#7)
- GPT-6 Sol: 33.5 (#49)

| Benchmark | GPT-5.6 Sol | GPT-6 Sol |
|---|---|---|
| GDP.pdf | 30.7% | 28% |
| APEX-Agents | 51.4% | — |
| OSWorld 2.0 | 27.3% | — |
| τ²-bench Banking | 46.9% | — |
| PostTrainBench | 36.2% | — |
| BALROG | 60% | — |
| GBAEval | 52.6% | — |
| LMArena Search | 1257 | — |
| Vending-Bench 2 | 9,619 | — |

## Reasoning

- GPT-5.6 Sol: 74.7 (#6)
- GPT-6 Sol: 49.3 (#34)

| Benchmark | GPT-5.6 Sol | GPT-6 Sol |
|---|---|---|
| NYT Connections (extended) | 93.8% | 90.1% |
| EBR-Bench | 44.8% | 53.3% |
| LMArena Hard Prompts | 1481 | 1420 |
| ARC-AGI-2 | 92.5% | — |
| SimpleBench | 71.7% | — |
| Kagi LLM Benchmark | 67% | — |
| ARC-AGI-1 | 97.5% | — |
| CritPt | 32.3% | — |
| Chess Puzzles | 64% | — |
| EnigmaEval | 37.1% | — |
| Mystery Game Puzzles | 58% | — |
| DTBench | 96% | — |
| LMCA | 59.2% | — |
| Surface Evolver Bench | 93.1% | — |
| Bench to the Future 3 | 0.14 | — |
| Epoch Capabilities Index | 161.99 | — |

## Math

- GPT-5.6 Sol: 85.5 (#7)
- GPT-6 Sol: 35.8 (#135)

| Benchmark | GPT-5.6 Sol | GPT-6 Sol |
|---|---|---|
| LMArena Math | 1472 | 1404 |
| FrontierMath (Tiers 1-3) | 89.1% | — |
| FrontierMath Tier 4 | 82.9% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 83% | — |
| FrontierMath Erdős | 0% | — |

## Knowledge

- GPT-5.6 Sol: 64.3 (#16)
- GPT-6 Sol: 43.0 (#87)

| Benchmark | GPT-5.6 Sol | GPT-6 Sol |
|---|---|---|
| Vectara Hallucination Rate | 12.4% | 6.5% |
| LMArena Expert | 1517 | 1449 |
| GPQA Diamond | 93.5% | — |
| SimpleQA Verified | 69.7% | — |

## Multimodal

- GPT-5.6 Sol: 48.9 (#8)
- GPT-6 Sol: 47.6 (#9)

| Benchmark | GPT-5.6 Sol | GPT-6 Sol |
|---|---|---|
| Furniture Assembly | 56.7% | 58.3% |
| LMArena Vision | 1281 | — |
| Blueprint-Bench 2 | 33.6% | — |
| LMArena Document | 1483 | — |

## Multilingual

- GPT-5.6 Sol: 55.4 (#32)
- GPT-6 Sol: 51.0 (#113)

| Benchmark | GPT-5.6 Sol | GPT-6 Sol |
|---|---|---|
| LMArena Non-English | 1450 | 1389 |
| LMArena Chinese | 1523 | 1416 |
| LMArena Russian | 1466 | 1407 |
| LMArena Spanish | 1449 | 1377 |
| LMArena French | 1475 | — |
| LMArena German | 1476 | — |
| LMArena Japanese | 1475 | — |
| LMArena Korean | 1434 | — |

## Instruction Following

- GPT-5.6 Sol: 77.8 (#16)
- GPT-6 Sol: 74.4 (#97)

| Benchmark | GPT-5.6 Sol | GPT-6 Sol |
|---|---|---|
| LMArena Instruction Following | 1480 | 1406 |

## Long Context

- GPT-5.6 Sol: 45.3 (#42)
- GPT-6 Sol: 43.2 (#100)

| Benchmark | GPT-5.6 Sol | GPT-6 Sol |
|---|---|---|
| LMArena Longer Query | 1479 | 1415 |

## Writing & Preference

- GPT-5.6 Sol: 73.5 (#12)
- GPT-6 Sol: 72.3 (#15)

| Benchmark | GPT-5.6 Sol | GPT-6 Sol |
|---|---|---|
| LMArena Text | 1456 | 1396 |
| LMArena Creative Writing | 1450 | 1392 |
| EQ-Bench Creative Writing | 1972 | 2125 |
| LMArena Multi-Turn | 1456 | 1405 |
| EQ-Bench 4 | 1250 | — |

## FAQ

### Is GPT-5.6 Sol better than GPT-6 Sol?

GPT-5.6 Sol is the stronger model overall, scoring 64.4 to 49.2 on the Noometry Index. GPT-6 Sol costs 2.0× less per token, which makes it the better buy when GPT-5.6 Sol's lead doesn't matter for your workload.

### Which is cheaper, GPT-5.6 Sol or GPT-6 Sol?

GPT-6 Sol is cheaper. It lists at $2 per million input tokens and $10 per million output tokens; GPT-5.6 Sol lists at $4 and $20.

### Is GPT-5.6 Sol or GPT-6 Sol better for coding?

GPT-5.6 Sol scores higher on coding benchmarks: 61.1 versus 59.6 in the Noometry coding category.

### Which has the bigger context window?

Both accept 1.05M tokens.

### How many benchmarks do GPT-5.6 Sol and GPT-6 Sol share?

22 benchmarks have published results for both models. GPT-5.6 Sol has 64 scored results on Noometry and GPT-6 Sol has 22.