# GPT-4o vs GPT-5.3 Chat

> GPT-5.3 Chat is the stronger model overall, scoring 42.1 to 28.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-4o-vs-gpt-5-3-chat
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. GPT-4o scores higher in 0 categories and GPT-5.3 Chat in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.3 Chat leads 35.4 to 10.2.
- GPT-4o is cheaper at $2.50 / $10 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.

## Snapshot

| | GPT-4o | GPT-5.3 Chat |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 28.5 | 42.1 |
| Rank | 316 | 109 |
| Context | 128K | 128K |
| Input $/M | $2.50 | $1.75 |
| Output $/M | $10 | $14 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-4o: 25.1 (#323)
- GPT-5.3 Chat: 40.8 (#124)

| Benchmark | GPT-4o | GPT-5.3 Chat |
|---|---|---|
| LMArena Coding | 1297 | 1408 |
| SWE-bench Verified | 31% | — |
| SWE-bench Verified (bash only) | 21.6% | — |
| Aider Polyglot | 45.3% | — |
| GSO | 0% | — |
| WeirdML | 25.1% | — |
| BigCodeBench Instruct | 51.1% | — |
| LiveBench Coding | 51.4% | — |
| BigCodeBench Complete | 61.1% | — |
| CadEval | 26% | — |
| HumanEval+ | 87.2% | — |
| MBPP+ | 72.2% | — |

## Agentic & Tool Use

- GPT-4o: 20.8 (#133)
- GPT-5.3 Chat: —

| Benchmark | GPT-4o | GPT-5.3 Chat |
|---|---|---|
| GDPval | 9.9% | — |
| TheAgentCompany | 8.6% | — |
| Cybench | 12.5% | — |
| BALROG | 32.3% | — |
| LMArena Search | 1006 | — |
| METR Time Horizons | 40.8% | — |

## Reasoning

- GPT-4o: 9.4 (#338)
- GPT-5.3 Chat: 27.3 (#105)

| Benchmark | GPT-4o | GPT-5.3 Chat |
|---|---|---|
| LMArena Hard Prompts | 1281 | 1399 |
| ARC-AGI-2 | 0% | — |
| SimpleBench | 17.8% | — |
| ARC-AGI-1 | 4.5% | — |
| CritPt | 0% | — |
| Chess Puzzles | 13% | — |
| EnigmaEval | 0.8% | — |
| LiveBench Reasoning | 55.8% | — |
| DTBench | 64.5% | — |
| LiveBench Data Analysis | 60.9% | — |
| LMCA | 16.6% | — |
| Epoch Capabilities Index | 128.97 | — |
| ForecastBench | 57.7 | — |
| LiveBench | 55.3% | — |

## Math

- GPT-4o: 10.2 (#303)
- GPT-5.3 Chat: 35.4 (#146)

| Benchmark | GPT-4o | GPT-5.3 Chat |
|---|---|---|
| LMArena Math | 1285 | 1389 |
| FrontierMath (Tiers 1-3) | 0.4% | — |
| OTIS Mock AIME 2024-2025 | 6.4% | — |
| Omni-MATH | 29.3% | — |
| LiveBench Math | 49.5% | — |
| MATH Level 5 | 53.3% | — |
| FrontierMath (Feb 2025 set) | 0.3% | — |

## Knowledge

- GPT-4o: 28.8 (#235)
- GPT-5.3 Chat: 38.2 (#137)

| Benchmark | GPT-4o | GPT-5.3 Chat |
|---|---|---|
| LMArena Expert | 1250 | 1397 |
| GPQA Diamond | 49.2% | — |
| Humanity's Last Exam | 2.7% | — |
| SimpleQA Verified | 26% | — |
| MMLU-Pro | 71.3% | — |
| Confabulations | 15.3% | — |
| Vectara Hallucination Rate | 9.6% | — |
| GPQA (HELM) | 52% | — |
| MMLU | 88.1% | — |

## Multimodal

- GPT-4o: 33.9 (#85)
- GPT-5.3 Chat: —

| Benchmark | GPT-4o | GPT-5.3 Chat |
|---|---|---|
| LMArena Vision | 1137 | — |
| Video-MME | 71.9% | — |
| GeoBench | 71% | — |
| VPCT | 40% | — |
| ScienceQA | 88.5% | — |

## Multilingual

- GPT-4o: 43.4 (#181)
- GPT-5.3 Chat: 50.5 (#119)

| Benchmark | GPT-4o | GPT-5.3 Chat |
|---|---|---|
| LMArena Non-English | 1283 | 1383 |
| LMArena Chinese | 1277 | 1433 |
| LMArena French | 1303 | 1398 |
| LMArena German | 1282 | 1384 |
| LMArena Japanese | 1257 | 1351 |
| LMArena Korean | 1234 | 1347 |
| LMArena Russian | 1286 | 1400 |
| LMArena Spanish | 1292 | 1371 |

## Instruction Following

- GPT-4o: 66.8 (#202)
- GPT-5.3 Chat: 73.0 (#124)

| Benchmark | GPT-4o | GPT-5.3 Chat |
|---|---|---|
| LMArena Instruction Following | 1278 | 1378 |
| LiveBench Instruction Following | 68.6% | — |
| IFEval | 81.7% | — |

## Long Context

- GPT-4o: 39.4 (#174)
- GPT-5.3 Chat: 42.6 (#115)

| Benchmark | GPT-4o | GPT-5.3 Chat |
|---|---|---|
| LMArena Longer Query | 1289 | 1396 |
| Fiction.LiveBench | 66.7% | — |

## Writing & Preference

- GPT-4o: 52.8 (#160)
- GPT-5.3 Chat: 63.3 (#65)

| Benchmark | GPT-4o | GPT-5.3 Chat |
|---|---|---|
| LMArena Text | 1300 | 1389 |
| LMArena Creative Writing | 1291 | 1356 |
| LMArena Multi-Turn | 1302 | 1413 |
| Short-Story Creative Writing | 81.8% | — |
| EQ-Bench Creative Writing | — | 1690 |
| WildBench | 82.8% | — |
| LiveBench Language | 47.6% | — |

## FAQ

### Is GPT-4o better than GPT-5.3 Chat?

GPT-5.3 Chat is the stronger model overall, scoring 42.1 to 28.5 on the Noometry Index.

### Which is cheaper, GPT-4o or GPT-5.3 Chat?

GPT-4o is cheaper. It lists at $2.50 per million input tokens and $10 per million output tokens; GPT-5.3 Chat lists at $1.75 and $14.

### Is GPT-4o or GPT-5.3 Chat better for coding?

GPT-5.3 Chat scores higher on coding benchmarks: 40.8 versus 25.1 in the Noometry coding category.

### Which has the bigger context window?

Both accept 128K tokens.

### How many benchmarks do GPT-4o and GPT-5.3 Chat share?

17 benchmarks have published results for both models. GPT-4o has 72 scored results on Noometry and GPT-5.3 Chat has 18.