# Chatgpt 4o Latest 20250326 vs GPT-5 Nano

> Chatgpt 4o Latest 20250326 is the stronger model overall, scoring 43.8 to 33.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/chatgpt-4o-vs-gpt-5-nano
- Last updated: 2026-10-12
- Shared benchmarks: 19

## Summary

- They share 19 benchmarks with published results for both. Chatgpt 4o Latest 20250326 scores higher in 8 categories and GPT-5 Nano in 1 category; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Chatgpt 4o Latest 20250326 leads 62.6 to 39.1.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 75% for Chatgpt 4o Latest 20250326 and 62.2% for GPT-5 Nano.

## Snapshot

| | Chatgpt 4o Latest 20250326 | GPT-5 Nano |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 43.8 | 33.5 |
| Rank | 82 | 241 |
| Context | — | 400K |
| Input $/M | — | $0.05 |
| Output $/M | — | $0.40 |
| Weights | Proprietary | Proprietary |

## Coding

- Chatgpt 4o Latest 20250326: 41.6 (#122)
- GPT-5 Nano: 33.6 (#254)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5 Nano |
|---|---|---|
| LMArena Coding | 1413 | 1351 |
| SWE-bench Verified (bash only) | — | 34.8% |
| WeirdML | — | 38.1% |
| ALE-Bench | — | 718.67 |

## Agentic & Tool Use

- Chatgpt 4o Latest 20250326: —
- GPT-5 Nano: 25.8 (#106)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5 Nano |
|---|---|---|
| Terminal-Bench | — | 21.8% |
| Berkeley Function Calling Leaderboard | — | 51.5% |

## Reasoning

- Chatgpt 4o Latest 20250326: 33.8 (#71)
- GPT-5 Nano: 16.3 (#306)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5 Nano |
|---|---|---|
| Kagi LLM Benchmark | 75% | 62.2% |
| LMArena Hard Prompts | 1424 | 1328 |
| ARC-AGI-2 | — | 2.6% |
| ARC-AGI-1 | — | 20.7% |
| Chess Puzzles | — | 27% |
| Mystery Game Puzzles | — | 9% |
| DTBench | — | 62.7% |
| LMCA | — | 7.9% |
| Epoch Capabilities Index | — | 139.38 |
| ForecastBench | — | 59.1 |

## Math

- Chatgpt 4o Latest 20250326: 38.6 (#134)
- GPT-5 Nano: 29.4 (#241)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5 Nano |
|---|---|---|
| LMArena Math | 1407 | 1317 |
| FrontierMath (Tiers 1-3) | — | 20% |
| FrontierMath Tier 4 | — | 2.4% |
| OTIS Mock AIME 2024-2025 | — | 81.1% |
| ProofBench | — | 12% |
| Omni-MATH | — | 54.6% |
| MATH Level 5 | — | 95.2% |
| FrontierMath (Feb 2025 set) | — | 8.3% |
| FrontierMath Tier 4 (v1) | — | 2.1% |

## Knowledge

- Chatgpt 4o Latest 20250326: 39.2 (#137)
- GPT-5 Nano: 35.9 (#178)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5 Nano |
|---|---|---|
| LMArena Expert | 1401 | 1321 |
| GPQA Diamond | — | 69.4% |
| SimpleQA Verified | — | 11.7% |
| MMLU-Pro | — | 77.8% |
| Confabulations | 16.6% | — |
| Vectara Hallucination Rate | — | 10.5% |
| GPQA (HELM) | — | 67.9% |

## Multimodal

- Chatgpt 4o Latest 20250326: 39.6 (#58)
- GPT-5 Nano: 31.3 (#108)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5 Nano |
|---|---|---|
| LMArena Vision | 1243 | 1159 |
| VPCT | — | 37.2% |

## Multilingual

- Chatgpt 4o Latest 20250326: 52.9 (#76)
- GPT-5 Nano: 45.3 (#172)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5 Nano |
|---|---|---|
| LMArena Non-English | 1419 | 1313 |
| LMArena Chinese | 1457 | 1356 |
| LMArena German | 1423 | 1327 |
| LMArena Japanese | 1405 | 1226 |
| LMArena Korean | 1396 | 1269 |
| LMArena Russian | 1429 | 1296 |
| LMArena Spanish | 1434 | 1360 |
| LMArena French | 1446 | — |

## Instruction Following

- Chatgpt 4o Latest 20250326: 74.0 (#107)
- GPT-5 Nano: 75.0 (#79)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5 Nano |
|---|---|---|
| LMArena Instruction Following | 1403 | 1306 |
| IFEval | — | 93.2% |

## Long Context

- Chatgpt 4o Latest 20250326: 43.1 (#107)
- GPT-5 Nano: 31.3 (#281)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5 Nano |
|---|---|---|
| LMArena Longer Query | 1413 | 1312 |
| Fiction.LiveBench | — | 44.4% |

## Writing & Preference

- Chatgpt 4o Latest 20250326: 62.6 (#72)
- GPT-5 Nano: 39.1 (#249)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5 Nano |
|---|---|---|
| LMArena Text | 1429 | 1320 |
| LMArena Creative Writing | 1405 | 1249 |
| EQ-Bench Creative Writing | 1501 | 705 |
| LMArena Multi-Turn | 1454 | 1311 |
| WildBench | — | 80.6% |

## FAQ

### Is Chatgpt 4o Latest 20250326 better than GPT-5 Nano?

Chatgpt 4o Latest 20250326 is the stronger model overall, scoring 43.8 to 33.5 on the Noometry Index.

### Is Chatgpt 4o Latest 20250326 or GPT-5 Nano better for coding?

Chatgpt 4o Latest 20250326 scores higher on coding benchmarks: 41.6 versus 33.6 in the Noometry coding category.

### How many benchmarks do Chatgpt 4o Latest 20250326 and GPT-5 Nano share?

19 benchmarks have published results for both models. Chatgpt 4o Latest 20250326 has 21 scored results on Noometry and GPT-5 Nano has 49.