# Chatgpt 4o Latest 20250326 vs GPT-5.1-Codex

> Chatgpt 4o Latest 20250326 is the stronger model overall, scoring 43.8 to 38.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/chatgpt-4o-vs-gpt-5-1-codex
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in math, where Chatgpt 4o Latest 20250326 leads 38.6 to 30.3.

## Snapshot

| | Chatgpt 4o Latest 20250326 | GPT-5.1-Codex |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 43.8 | 38.6 |
| Rank | 82 | 186 |
| Context | — | 400K |
| Input $/M | — | $1.25 |
| Output $/M | — | $10 |
| Weights | Proprietary | Proprietary |

## Coding

- Chatgpt 4o Latest 20250326: 41.6 (#122)
- GPT-5.1-Codex: 41.9 (#116)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.1-Codex |
|---|---|---|
| SWE-bench Verified (bash only) | — | 66% |
| LMArena WebDev | — | 1337 |
| LMArena Coding | 1413 | — |
| ALE-Bench | — | 1,245 |

## Agentic & Tool Use

- Chatgpt 4o Latest 20250326: —
- GPT-5.1-Codex: 38.0 (#33)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.1-Codex |
|---|---|---|
| Terminal-Bench | — | 60.4% |
| METR Time Horizons | — | 70.8% |

## Reasoning

- Chatgpt 4o Latest 20250326: 33.8 (#71)
- GPT-5.1-Codex: —

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.1-Codex |
|---|---|---|
| Kagi LLM Benchmark | 75% | — |
| LMArena Hard Prompts | 1424 | — |

## Math

- Chatgpt 4o Latest 20250326: 38.6 (#134)
- GPT-5.1-Codex: 30.3 (#235)

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.1-Codex |
|---|---|---|
| ProofBench | — | 9% |
| LMArena Math | 1407 | — |

## Knowledge

- Chatgpt 4o Latest 20250326: 39.2 (#137)
- GPT-5.1-Codex: —

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.1-Codex |
|---|---|---|
| Confabulations | 16.6% | — |
| LMArena Expert | 1401 | — |

## Multimodal

- Chatgpt 4o Latest 20250326: 39.6 (#58)
- GPT-5.1-Codex: —

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.1-Codex |
|---|---|---|
| LMArena Vision | 1243 | — |

## Multilingual

- Chatgpt 4o Latest 20250326: 52.9 (#76)
- GPT-5.1-Codex: —

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.1-Codex |
|---|---|---|
| LMArena Non-English | 1419 | — |
| LMArena Chinese | 1457 | — |
| LMArena French | 1446 | — |
| LMArena German | 1423 | — |
| LMArena Japanese | 1405 | — |
| LMArena Korean | 1396 | — |
| LMArena Russian | 1429 | — |
| LMArena Spanish | 1434 | — |

## Instruction Following

- Chatgpt 4o Latest 20250326: 74.0 (#107)
- GPT-5.1-Codex: —

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.1-Codex |
|---|---|---|
| LMArena Instruction Following | 1403 | — |

## Long Context

- Chatgpt 4o Latest 20250326: 43.1 (#107)
- GPT-5.1-Codex: —

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.1-Codex |
|---|---|---|
| LMArena Longer Query | 1413 | — |

## Writing & Preference

- Chatgpt 4o Latest 20250326: 62.6 (#72)
- GPT-5.1-Codex: —

| Benchmark | Chatgpt 4o Latest 20250326 | GPT-5.1-Codex |
|---|---|---|
| LMArena Text | 1429 | — |
| LMArena Creative Writing | 1405 | — |
| EQ-Bench Creative Writing | 1501 | — |
| LMArena Multi-Turn | 1454 | — |

## FAQ

### Is Chatgpt 4o Latest 20250326 better than GPT-5.1-Codex?

Chatgpt 4o Latest 20250326 is the stronger model overall, scoring 43.8 to 38.6 on the Noometry Index.

### Is Chatgpt 4o Latest 20250326 or GPT-5.1-Codex better for coding?

They score almost the same on coding (41.6 vs 41.9); test both on your own repository before choosing.

### How many benchmarks do Chatgpt 4o Latest 20250326 and GPT-5.1-Codex share?

0 benchmarks have published results for both models. Chatgpt 4o Latest 20250326 has 21 scored results on Noometry and GPT-5.1-Codex has 6.