# Chatgpt 4o Latest 20250326 vs GPT-5.5 Pro

> GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 43.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/chatgpt-4o-vs-gpt-5-5-pro
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in math, where GPT-5.5 Pro leads 83.8 to 35.8.

## Snapshot

| | Chatgpt 4o Latest 20250326 | GPT-5.5 Pro |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 43.2 | 64.3 |
| Rank | 84 | 7 |
| Context | — | 1.05M |
| Input $/M | — | $30 |
| Output $/M | — | $180 |
| Weights | Proprietary | Proprietary |

## Coding

- Chatgpt 4o Latest 20250326: 41.0 (#122)
- GPT-5.5 Pro: —

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Pro |
|---|---|---|
| LMArena Coding | 1413 | — |

## Reasoning

- Chatgpt 4o Latest 20250326: 32.8 (#64)
- GPT-5.5 Pro: 73.6 (#7)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Pro |
|---|---|---|
| ARC-AGI-2 | — | 84.6% |
| SimpleBench | — | 76.9% |
| Kagi LLM Benchmark | 75% | — |
| ARC-AGI-1 | — | 96.5% |
| CritPt | — | 30.6% |
| Chess Puzzles | — | 64% |
| LMArena Hard Prompts | 1424 | — |
| DTBench | — | 96% |
| LMCA | — | 53.9% |
| Epoch Capabilities Index | — | 162.45 |

## Math

- Chatgpt 4o Latest 20250326: 35.8 (#134)
- GPT-5.5 Pro: 83.8 (#8)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 87.7% |
| FrontierMath Tier 4 | — | 78% |
| OTIS Mock AIME 2024-2025 | — | 100% |
| LMArena Math | 1407 | — |
| FrontierMath (Feb 2025 set) | — | 52.4% |
| FrontierMath Tier 4 (v1) | — | 39.6% |

## Knowledge

- Chatgpt 4o Latest 20250326: 38.7 (#131)
- GPT-5.5 Pro: 64.2 (#17)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Pro |
|---|---|---|
| GPQA Diamond | — | 93.9% |
| Confabulations | 16.6% | — |
| LMArena Expert | 1400 | — |

## Multimodal

- Chatgpt 4o Latest 20250326: 38.9 (#54)
- GPT-5.5 Pro: —

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Pro |
|---|---|---|
| LMArena Vision | 1243 | — |

## Multilingual

- Chatgpt 4o Latest 20250326: 53.1 (#72)
- GPT-5.5 Pro: —

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Pro |
|---|---|---|
| LMArena Non-English | 1419 | — |
| LMArena Chinese | 1456 | — |
| LMArena French | 1447 | — |
| LMArena German | 1424 | — |
| LMArena Japanese | 1406 | — |
| LMArena Korean | 1397 | — |
| LMArena Russian | 1429 | — |
| LMArena Spanish | 1435 | — |

## Instruction Following

- Chatgpt 4o Latest 20250326: 74.2 (#102)
- GPT-5.5 Pro: —

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Pro |
|---|---|---|
| LMArena Instruction Following | 1403 | — |

## Long Context

- Chatgpt 4o Latest 20250326: 43.1 (#104)
- GPT-5.5 Pro: —

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Pro |
|---|---|---|
| LMArena Longer Query | 1413 | — |

## Writing & Preference

- Chatgpt 4o Latest 20250326: 62.8 (#68)
- GPT-5.5 Pro: —

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.5 Pro |
|---|---|---|
| LMArena Text | 1429 | — |
| LMArena Creative Writing | 1406 | — |
| EQ-Bench Creative Writing | 1501 | — |
| LMArena Multi-Turn | 1454 | — |

## FAQ

### Is Chatgpt 4o Latest 20250326 better than GPT-5.5 Pro?

GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 43.2 on the Noometry Index.

### How many benchmarks do Chatgpt 4o Latest 20250326 and GPT-5.5 Pro share?

0 benchmarks have published results for both models. Chatgpt 4o Latest 20250326 has 21 scored results on Noometry and GPT-5.5 Pro has 14.