Model comparison
GPT-4o vs GPT-5.3 Chat
GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 28.6 on the Noometry Index.
Last verified . 17 shared benchmarks.
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 38.2 to 10.6.
- GPT-4o is cheaper at $2.50 / $10 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
Side by side
| GPT-4o | GPT-5.3 Chat | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 28.6 | 42.8 |
| Released | 2024-05-13 | 2026-03-03 |
| Weights | Proprietary | Proprietary |
| Context window | 128K | 128K |
| Max output | 16K | 16K |
| Input $ / M tokens | $2.50 | $1.75 |
| Output $ / M tokens | $10 | $14 |
| Results tracked | 72 | 18 |
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Category by category
Coding GPT-5.3 Chat leads
GPT-4o: 24.8 (#328), GPT-5.3 Chat: 41.4 (#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 Not comparable
GPT-4o: 21.0 (#141), 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-5.3 Chat leads
GPT-4o: 9.4 (#343), GPT-5.3 Chat: 28.5 (#102)
| 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-5.3 Chat leads
GPT-4o: 10.6 (#312), GPT-5.3 Chat: 38.2 (#142)
| 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-5.3 Chat leads
GPT-4o: 28.8 (#242), GPT-5.3 Chat: 38.8 (#140)
| 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 Not comparable
GPT-4o: 34.5 (#91), 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-5.3 Chat leads
GPT-4o: 43.2 (#186), GPT-5.3 Chat: 50.3 (#124)
| Benchmark | GPT-4o | GPT-5.3 Chat |
|---|---|---|
| LMArena Non-English | 1283 | 1382 |
| LMArena Chinese | 1277 | 1432 |
| LMArena French | 1304 | 1397 |
| LMArena German | 1282 | 1384 |
| LMArena Japanese | 1257 | 1352 |
| LMArena Korean | 1234 | 1346 |
| LMArena Russian | 1286 | 1400 |
| LMArena Spanish | 1292 | 1371 |
Instruction Following GPT-5.3 Chat leads
GPT-4o: 66.6 (#207), GPT-5.3 Chat: 72.8 (#129)
| Benchmark | GPT-4o | GPT-5.3 Chat |
|---|---|---|
| LMArena Instruction Following | 1278 | 1378 |
| LiveBench Instruction Following | 68.6% | — |
| IFEval | 81.7% | — |
Long Context GPT-5.3 Chat leads
GPT-4o: 39.4 (#179), GPT-5.3 Chat: 42.6 (#120)
| Benchmark | GPT-4o | GPT-5.3 Chat |
|---|---|---|
| LMArena Longer Query | 1289 | 1396 |
| Fiction.LiveBench | 66.7% | — |
Writing & Preference GPT-5.3 Chat leads
GPT-4o: 52.6 (#166), GPT-5.3 Chat: 63.1 (#68)
| Benchmark | GPT-4o | GPT-5.3 Chat |
|---|---|---|
| LMArena Text | 1300 | 1389 |
| LMArena Creative Writing | 1292 | 1355 |
| LMArena Multi-Turn | 1302 | 1412 |
| Short-Story Creative Writing | 81.8% | — |
| EQ-Bench Creative Writing | — | 1690 |
| WildBench | 82.8% | — |
| LiveBench Language | 47.6% | — |
Frequently asked questions
Is GPT-4o better than GPT-5.3 Chat?
GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 28.6 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: 41.4 versus 24.8 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.