# GPT-5.3 Chat vs o1-mini

> GPT-5.3 Chat is the stronger model overall, scoring 42.1 to 33.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-3-chat-vs-o1-mini
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. GPT-5.3 Chat scores higher in 8 categories and o1-mini in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.3 Chat leads 27.3 to 8.9.

## Snapshot

| | GPT-5.3 Chat | o1-mini |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 42.1 | 33.7 |
| Rank | 109 | 230 |
| Context | 128K | — |
| Input $/M | $1.75 | — |
| Output $/M | $14 | — |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.3 Chat: 40.8 (#124)
- o1-mini: 35.1 (#218)

| Benchmark | GPT-5.3 Chat | o1-mini |
|---|---|---|
| LMArena Coding | 1408 | 1362 |
| Aider Polyglot | — | 32.9% |
| WeirdML | — | 36.3% |
| LiveBench Coding | — | 48% |
| HumanEval+ | — | 89% |
| MBPP+ | — | 78.8% |

## Agentic & Tool Use

- GPT-5.3 Chat: —
- o1-mini: 24.3 (#112)

| Benchmark | GPT-5.3 Chat | o1-mini |
|---|---|---|
| Cybench | — | 10% |

## Reasoning

- GPT-5.3 Chat: 27.3 (#105)
- o1-mini: 8.9 (#340)

| Benchmark | GPT-5.3 Chat | o1-mini |
|---|---|---|
| LMArena Hard Prompts | 1399 | 1333 |
| ARC-AGI-2 | — | 0.8% |
| SimpleBench | — | 18.1% |
| ARC-AGI-1 | — | 14% |
| LiveBench Reasoning | — | 72.3% |
| LiveBench Data Analysis | — | 57.9% |
| Epoch Capabilities Index | — | 135.82 |
| LiveBench | — | 57.8% |

## Math

- GPT-5.3 Chat: 35.4 (#146)
- o1-mini: 33.7 (#168)

| Benchmark | GPT-5.3 Chat | o1-mini |
|---|---|---|
| LMArena Math | 1389 | 1358 |
| OTIS Mock AIME 2024-2025 | — | 46.9% |
| LiveBench Math | — | 62% |
| MATH Level 5 | — | 89.2% |
| FrontierMath (Feb 2025 set) | — | 1.7% |

## Knowledge

- GPT-5.3 Chat: 38.2 (#137)
- o1-mini: 34.8 (#180)

| Benchmark | GPT-5.3 Chat | o1-mini |
|---|---|---|
| LMArena Expert | 1397 | 1316 |
| GPQA Diamond | — | 62.4% |
| Confabulations | — | 18.6% |

## Multilingual

- GPT-5.3 Chat: 50.5 (#119)
- o1-mini: 43.8 (#177)

| Benchmark | GPT-5.3 Chat | o1-mini |
|---|---|---|
| LMArena Non-English | 1383 | 1289 |
| LMArena Chinese | 1433 | 1314 |
| LMArena French | 1398 | 1292 |
| LMArena German | 1384 | 1278 |
| LMArena Japanese | 1351 | 1245 |
| LMArena Korean | 1347 | 1223 |
| LMArena Russian | 1400 | 1283 |
| LMArena Spanish | 1371 | 1302 |

## Instruction Following

- GPT-5.3 Chat: 73.0 (#124)
- o1-mini: 67.0 (#200)

| Benchmark | GPT-5.3 Chat | o1-mini |
|---|---|---|
| LMArena Instruction Following | 1378 | 1304 |
| LiveBench Instruction Following | — | 65.4% |

## Long Context

- GPT-5.3 Chat: 42.6 (#115)
- o1-mini: 40.1 (#156)

| Benchmark | GPT-5.3 Chat | o1-mini |
|---|---|---|
| LMArena Longer Query | 1396 | 1321 |

## Writing & Preference

- GPT-5.3 Chat: 63.3 (#65)
- o1-mini: 48.6 (#196)

| Benchmark | GPT-5.3 Chat | o1-mini |
|---|---|---|
| LMArena Text | 1389 | 1317 |
| LMArena Creative Writing | 1356 | 1244 |
| LMArena Multi-Turn | 1413 | 1314 |
| Short-Story Creative Writing | — | 64.9% |
| EQ-Bench Creative Writing | 1690 | — |
| LiveBench Language | — | 40.9% |

## FAQ

### Is GPT-5.3 Chat better than o1-mini?

GPT-5.3 Chat is the stronger model overall, scoring 42.1 to 33.7 on the Noometry Index.

### Is GPT-5.3 Chat or o1-mini better for coding?

GPT-5.3 Chat scores higher on coding benchmarks: 40.8 versus 35.1 in the Noometry coding category.

### How many benchmarks do GPT-5.3 Chat and o1-mini share?

17 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and o1-mini has 39.