# Chatgpt 4o Latest 20250326 vs GPT-5.6 Sol

> GPT-5.6 Sol is the stronger model overall, scoring 64.4 to 43.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/chatgpt-4o-vs-gpt-5-6-sol
- Last updated: 2026-10-10
- Shared benchmarks: 20

## Summary

- They share 20 benchmarks with published results for both. Chatgpt 4o Latest 20250326 scores higher in 0 categories and GPT-5.6 Sol in 9 categories; 9 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 Kagi LLM Benchmark: 75% for Chatgpt 4o Latest 20250326 and 67% for GPT-5.6 Sol.

## Snapshot

| | Chatgpt 4o Latest 20250326 | GPT-5.6 Sol |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 43.2 | 64.4 |
| Rank | 84 | 6 |
| Context | — | 1.05M |
| Input $/M | — | $4 |
| Output $/M | — | $20 |
| Weights | Proprietary | Proprietary |

## Coding

- Chatgpt 4o Latest 20250326: 41.0 (#122)
- GPT-5.6 Sol: 61.1 (#7)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.6 Sol |
|---|---|---|
| LMArena Coding | 1413 | 1493 |
| DeepSWE | — | 72.7% |
| FrontierCode | — | 47.5% |
| CursorBench | — | 41.7% |
| LMArena WebDev | — | 1619 |
| FrontierSWE | — | 32.2% |
| SciCode | — | 57.1% |
| WeirdML | — | 89.4% |
| MirrorCode | — | 20% |
| ALE-Bench | — | 2,177 |

## Agentic & Tool Use

- Chatgpt 4o Latest 20250326: —
- GPT-5.6 Sol: 50.2 (#7)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.6 Sol |
|---|---|---|
| APEX-Agents | — | 51.4% |
| OSWorld 2.0 | — | 27.3% |
| τ²-bench Banking | — | 46.9% |
| PostTrainBench | — | 36.2% |
| BALROG | — | 60% |
| GBAEval | — | 52.6% |
| GDP.pdf | — | 30.7% |
| LMArena Search | — | 1257 |
| Vending-Bench 2 | — | 9,619 |

## Reasoning

- Chatgpt 4o Latest 20250326: 32.8 (#64)
- GPT-5.6 Sol: 74.7 (#6)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.6 Sol |
|---|---|---|
| Kagi LLM Benchmark | 75% | 67% |
| LMArena Hard Prompts | 1424 | 1481 |
| ARC-AGI-2 | — | 92.5% |
| SimpleBench | — | 71.7% |
| NYT Connections (extended) | — | 93.8% |
| ARC-AGI-1 | — | 97.5% |
| CritPt | — | 32.3% |
| Chess Puzzles | — | 64% |
| EnigmaEval | — | 37.1% |
| EBR-Bench | — | 44.8% |
| 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

- Chatgpt 4o Latest 20250326: 35.8 (#134)
- GPT-5.6 Sol: 85.5 (#7)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.6 Sol |
|---|---|---|
| LMArena Math | 1407 | 1472 |
| FrontierMath (Tiers 1-3) | — | 89.1% |
| FrontierMath Tier 4 | — | 82.9% |
| OTIS Mock AIME 2024-2025 | — | 100% |
| ProofBench | — | 83% |
| FrontierMath Erdős | — | 0% |

## Knowledge

- Chatgpt 4o Latest 20250326: 38.7 (#131)
- GPT-5.6 Sol: 64.3 (#16)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.6 Sol |
|---|---|---|
| LMArena Expert | 1400 | 1517 |
| GPQA Diamond | — | 93.5% |
| SimpleQA Verified | — | 69.7% |
| Confabulations | 16.6% | — |
| Vectara Hallucination Rate | — | 12.4% |

## Multimodal

- Chatgpt 4o Latest 20250326: 38.9 (#54)
- GPT-5.6 Sol: 48.9 (#8)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.6 Sol |
|---|---|---|
| LMArena Vision | 1243 | 1281 |
| Blueprint-Bench 2 | — | 33.6% |
| Furniture Assembly | — | 56.7% |
| LMArena Document | — | 1483 |

## Multilingual

- Chatgpt 4o Latest 20250326: 53.1 (#72)
- GPT-5.6 Sol: 55.4 (#32)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.6 Sol |
|---|---|---|
| LMArena Non-English | 1419 | 1450 |
| LMArena Chinese | 1456 | 1523 |
| LMArena French | 1447 | 1475 |
| LMArena German | 1424 | 1476 |
| LMArena Japanese | 1406 | 1475 |
| LMArena Korean | 1397 | 1434 |
| LMArena Russian | 1429 | 1466 |
| LMArena Spanish | 1435 | 1449 |

## Instruction Following

- Chatgpt 4o Latest 20250326: 74.2 (#102)
- GPT-5.6 Sol: 77.8 (#16)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.6 Sol |
|---|---|---|
| LMArena Instruction Following | 1403 | 1480 |

## Long Context

- Chatgpt 4o Latest 20250326: 43.1 (#104)
- GPT-5.6 Sol: 45.3 (#42)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.6 Sol |
|---|---|---|
| LMArena Longer Query | 1413 | 1479 |

## Writing & Preference

- Chatgpt 4o Latest 20250326: 62.8 (#68)
- GPT-5.6 Sol: 73.5 (#12)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.6 Sol |
|---|---|---|
| LMArena Text | 1429 | 1456 |
| LMArena Creative Writing | 1406 | 1450 |
| EQ-Bench Creative Writing | 1501 | 1972 |
| LMArena Multi-Turn | 1454 | 1456 |
| EQ-Bench 4 | — | 1250 |

## FAQ

### Is Chatgpt 4o Latest 20250326 better than GPT-5.6 Sol?

GPT-5.6 Sol is the stronger model overall, scoring 64.4 to 43.2 on the Noometry Index.

### Is Chatgpt 4o Latest 20250326 or GPT-5.6 Sol better for coding?

GPT-5.6 Sol scores higher on coding benchmarks: 61.1 versus 41.0 in the Noometry coding category.

### How many benchmarks do Chatgpt 4o Latest 20250326 and GPT-5.6 Sol share?

20 benchmarks have published results for both models. Chatgpt 4o Latest 20250326 has 21 scored results on Noometry and GPT-5.6 Sol has 64.