Model comparison
GPT-5 Pro vs o3-pro
GPT-5 Pro is the stronger model overall, scoring 46.4 to 42.9 on the Noometry Index.
Last verified . 5 shared benchmarks.
Summary
- They share 5 benchmarks with published results for both. GPT-5 Pro scores higher in 2 categories and o3-pro in 1 category; 3 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where GPT-5 Pro leads 56.7 to 29.5.
- The biggest single-benchmark swing is ARC-AGI-2: 18.3% for GPT-5 Pro and 4.9% for o3-pro.
- o3-pro is cheaper at $20 / $80 per million input/output tokens, against $15 / $120 for GPT-5 Pro.
- GPT-5 Pro accepts more context: 400K tokens versus 200K.
Side by side
| GPT-5 Pro | o3-pro | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 46.4 | 42.9 |
| Released | 2025-10-06 | 2025-06-10 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 200K |
| Max output | 272K | 100K |
| Input $ / M tokens | $15 | $20 |
| Output $ / M tokens | $120 | $80 |
| Results tracked | 12 | 12 |
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Category by category
Coding o3-pro leads
GPT-5 Pro: 44.0 (#80), o3-pro: 55.5 (#24)
| Benchmark | GPT-5 Pro | o3-pro |
|---|---|---|
| WeirdML | 60.4% | 58.2% |
| Aider Polyglot | — | 84.9% |
| AlgoTune | 1.31 | — |
Reasoning GPT-5 Pro leads
GPT-5 Pro: 38.9 (#62), o3-pro: 23.8 (#171)
| Benchmark | GPT-5 Pro | o3-pro |
|---|---|---|
| ARC-AGI-2 | 18.3% | 4.9% |
| Kagi LLM Benchmark | 76.8% | 72.1% |
| ARC-AGI-1 | 70.2% | 59.3% |
| Epoch Capabilities Index | 150.28 | 147.42 |
| SimpleBench | 61.6% | — |
| EnigmaEval | 18.8% | — |
| DTBench | — | 86.9% |
| LMCA | — | 38.5% |
Math Not comparable
GPT-5 Pro: 48.5 (#63), o3-pro: —
| Benchmark | GPT-5 Pro | o3-pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | 55.8% | — |
| FrontierMath Tier 4 | 19.5% | — |
| FrontierMath Tier 4 (v1) | 14.6% | — |
Knowledge GPT-5 Pro leads
GPT-5 Pro: 56.7 (#42), o3-pro: 29.5 (#238)
| Benchmark | GPT-5 Pro | o3-pro |
|---|---|---|
| Humanity's Last Exam | 31.6% | — |
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 23.3% |
Long Context Not comparable
GPT-5 Pro: —, o3-pro: 72.2 (#1)
| Benchmark | GPT-5 Pro | o3-pro |
|---|---|---|
| Fiction.LiveBench | — | 97.2% |
Writing & Preference Not comparable
GPT-5 Pro: —, o3-pro: 57.1 (#133)
| Benchmark | GPT-5 Pro | o3-pro |
|---|---|---|
| Short-Story Creative Writing | — | 84.4% |
Frequently asked questions
Is GPT-5 Pro better than o3-pro?
GPT-5 Pro is the stronger model overall, scoring 46.4 to 42.9 on the Noometry Index.
Which is cheaper, GPT-5 Pro or o3-pro?
o3-pro is cheaper. It lists at $20 per million input tokens and $80 per million output tokens; GPT-5 Pro lists at $15 and $120.
Is GPT-5 Pro or o3-pro better for coding?
o3-pro scores higher on coding benchmarks: 55.5 versus 44.0 in the Noometry coding category.
Which has the bigger context window?
GPT-5 Pro does, with 400K tokens against 200K.
How many benchmarks do GPT-5 Pro and o3-pro share?
5 benchmarks have published results for both models. GPT-5 Pro has 12 scored results on Noometry and o3-pro has 12.