Model comparison
GPT-5.3 Chat vs o1-mini
GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 34.0 on the Noometry Index.
Last verified . 17 shared benchmarks.
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 28.5 to 8.8.
Side by side
| GPT-5.3 Chat | o1-mini | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 42.8 | 34.0 |
| Released | 2026-03-03 | 2024-09-12 |
| Weights | Proprietary | Proprietary |
| Context window | 128K | — |
| Max output | 16K | — |
| Input $ / M tokens | $1.75 | — |
| Output $ / M tokens | $14 | — |
| Results tracked | 18 | 39 |
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Category by category
Coding GPT-5.3 Chat leads
GPT-5.3 Chat: 41.4 (#124), o1-mini: 35.5 (#224)
| 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 Not comparable
GPT-5.3 Chat: —, o1-mini: 24.6 (#118)
| Benchmark | GPT-5.3 Chat | o1-mini |
|---|---|---|
| Cybench | — | 10% |
Reasoning GPT-5.3 Chat leads
GPT-5.3 Chat: 28.5 (#102), o1-mini: 8.8 (#346)
| 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 leads
GPT-5.3 Chat: 38.2 (#142), o1-mini: 35.4 (#186)
| 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 leads
GPT-5.3 Chat: 38.8 (#140), o1-mini: 34.9 (#192)
| Benchmark | GPT-5.3 Chat | o1-mini |
|---|---|---|
| LMArena Expert | 1397 | 1316 |
| GPQA Diamond | — | 62.4% |
| Confabulations | — | 18.6% |
Multilingual GPT-5.3 Chat leads
GPT-5.3 Chat: 50.3 (#124), o1-mini: 43.6 (#182)
| Benchmark | GPT-5.3 Chat | o1-mini |
|---|---|---|
| LMArena Non-English | 1382 | 1289 |
| LMArena Chinese | 1432 | 1314 |
| LMArena French | 1397 | 1293 |
| LMArena German | 1384 | 1278 |
| LMArena Japanese | 1352 | 1245 |
| LMArena Korean | 1346 | 1223 |
| LMArena Russian | 1400 | 1283 |
| LMArena Spanish | 1371 | 1303 |
Instruction Following GPT-5.3 Chat leads
GPT-5.3 Chat: 72.8 (#129), o1-mini: 66.7 (#206)
| Benchmark | GPT-5.3 Chat | o1-mini |
|---|---|---|
| LMArena Instruction Following | 1378 | 1304 |
| LiveBench Instruction Following | — | 65.4% |
Long Context GPT-5.3 Chat leads
GPT-5.3 Chat: 42.6 (#120), o1-mini: 40.1 (#161)
| Benchmark | GPT-5.3 Chat | o1-mini |
|---|---|---|
| LMArena Longer Query | 1396 | 1320 |
Writing & Preference GPT-5.3 Chat leads
GPT-5.3 Chat: 63.1 (#68), o1-mini: 48.4 (#202)
| Benchmark | GPT-5.3 Chat | o1-mini |
|---|---|---|
| LMArena Text | 1389 | 1317 |
| LMArena Creative Writing | 1355 | 1244 |
| LMArena Multi-Turn | 1412 | 1314 |
| Short-Story Creative Writing | — | 64.9% |
| EQ-Bench Creative Writing | 1690 | — |
| LiveBench Language | — | 40.9% |
Frequently asked questions
Is GPT-5.3 Chat better than o1-mini?
GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 34.0 on the Noometry Index.
Is GPT-5.3 Chat or o1-mini better for coding?
GPT-5.3 Chat scores higher on coding benchmarks: 41.4 versus 35.5 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.