Model comparison
GPT-5.3 Chat vs o1-pro
GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 31.5 on the Noometry Index.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in knowledge, where GPT-5.3 Chat leads 38.8 to 29.7.
- GPT-5.3 Chat is cheaper at $1.75 / $14 per million input/output tokens, against $150 / $600 for o1-pro.
- o1-pro accepts more context: 200K tokens versus 128K.
Side by side
| GPT-5.3 Chat | o1-pro | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 42.8 | 31.5 |
| Released | 2026-03-03 | 2025-03-19 |
| Weights | Proprietary | Proprietary |
| Context window | 128K | 200K |
| Max output | 16K | 100K |
| Input $ / M tokens | $1.75 | $150 |
| Output $ / M tokens | $14 | $600 |
| Results tracked | 18 | 3 |
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Category by category
Coding Not comparable
GPT-5.3 Chat: 41.4 (#124), o1-pro: —
| Benchmark | GPT-5.3 Chat | o1-pro |
|---|---|---|
| LMArena Coding | 1408 | — |
Reasoning GPT-5.3 Chat leads
GPT-5.3 Chat: 28.5 (#102), o1-pro: 20.4 (#239)
| Benchmark | GPT-5.3 Chat | o1-pro |
|---|---|---|
| ARC-AGI-1 | — | 23.3% |
| EnigmaEval | — | 6.1% |
| LMArena Hard Prompts | 1399 | — |
Math Not comparable
GPT-5.3 Chat: 38.2 (#142), o1-pro: —
| Benchmark | GPT-5.3 Chat | o1-pro |
|---|---|---|
| LMArena Math | 1389 | — |
Knowledge GPT-5.3 Chat leads
GPT-5.3 Chat: 38.8 (#140), o1-pro: 29.7 (#234)
| Benchmark | GPT-5.3 Chat | o1-pro |
|---|---|---|
| Humanity's Last Exam | — | 8.1% |
| LMArena Expert | 1397 | — |
Multilingual Not comparable
GPT-5.3 Chat: 50.3 (#124), o1-pro: —
| Benchmark | GPT-5.3 Chat | o1-pro |
|---|---|---|
| LMArena Non-English | 1382 | — |
| LMArena Chinese | 1432 | — |
| LMArena French | 1397 | — |
| LMArena German | 1384 | — |
| LMArena Japanese | 1352 | — |
| LMArena Korean | 1346 | — |
| LMArena Russian | 1400 | — |
| LMArena Spanish | 1371 | — |
Instruction Following Not comparable
GPT-5.3 Chat: 72.8 (#129), o1-pro: —
| Benchmark | GPT-5.3 Chat | o1-pro |
|---|---|---|
| LMArena Instruction Following | 1378 | — |
Long Context Not comparable
GPT-5.3 Chat: 42.6 (#120), o1-pro: —
| Benchmark | GPT-5.3 Chat | o1-pro |
|---|---|---|
| LMArena Longer Query | 1396 | — |
Writing & Preference Not comparable
GPT-5.3 Chat: 63.1 (#68), o1-pro: —
| Benchmark | GPT-5.3 Chat | o1-pro |
|---|---|---|
| LMArena Text | 1389 | — |
| LMArena Creative Writing | 1355 | — |
| EQ-Bench Creative Writing | 1690 | — |
| LMArena Multi-Turn | 1412 | — |
Frequently asked questions
Is GPT-5.3 Chat better than o1-pro?
GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 31.5 on the Noometry Index.
Which is cheaper, GPT-5.3 Chat or o1-pro?
GPT-5.3 Chat is cheaper. It lists at $1.75 per million input tokens and $14 per million output tokens; o1-pro lists at $150 and $600.
Which has the bigger context window?
o1-pro does, with 200K tokens against 128K.
How many benchmarks do GPT-5.3 Chat and o1-pro share?
0 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and o1-pro has 3.