Model comparison
GPT-5.5 Pro vs o1-pro
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 31.5 on the Noometry Index.
Last verified . 1 shared benchmarks.
Summary
- They share 1 benchmark with published results for both. GPT-5.5 Pro scores higher in 2 categories and o1-pro in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.3 to 20.4.
- The biggest single-benchmark swing is ARC-AGI-1: 96.5% for GPT-5.5 Pro and 23.3% for o1-pro.
- GPT-5.5 Pro is cheaper at $30 / $180 per million input/output tokens, against $150 / $600 for o1-pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 200K.
Side by side
| GPT-5.5 Pro | o1-pro | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 64.3 | 31.5 |
| Released | 2026-04-23 | 2025-03-19 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 200K |
| Max output | 128K | 100K |
| Input $ / M tokens | $30 | $150 |
| Output $ / M tokens | $180 | $600 |
| Results tracked | 14 | 3 |
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Category by category
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.3 (#10), o1-pro: 20.4 (#239)
| Benchmark | GPT-5.5 Pro | o1-pro |
|---|---|---|
| ARC-AGI-1 | 96.5% | 23.3% |
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| CritPt | 30.6% | — |
| Chess Puzzles | 64% | — |
| EnigmaEval | — | 6.1% |
| DTBench | 96% | — |
| LMCA | 53.9% | — |
| Epoch Capabilities Index | 162.07 | — |
Math Not comparable
GPT-5.5 Pro: 84.0 (#10), o1-pro: —
| Benchmark | GPT-5.5 Pro | o1-pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| FrontierMath (Feb 2025 set) | 52.4% | — |
| FrontierMath Tier 4 (v1) | 39.6% | — |
Knowledge GPT-5.5 Pro leads
GPT-5.5 Pro: 64.1 (#19), o1-pro: 29.7 (#234)
| Benchmark | GPT-5.5 Pro | o1-pro |
|---|---|---|
| GPQA Diamond | 93.9% | — |
| Humanity's Last Exam | — | 8.1% |
Frequently asked questions
Is GPT-5.5 Pro better than o1-pro?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 31.5 on the Noometry Index.
Which is cheaper, GPT-5.5 Pro or o1-pro?
GPT-5.5 Pro is cheaper. It lists at $30 per million input tokens and $180 per million output tokens; o1-pro lists at $150 and $600.
Which has the bigger context window?
GPT-5.5 Pro does, with 1.05M tokens against 200K.
How many benchmarks do GPT-5.5 Pro and o1-pro share?
1 benchmark has published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and o1-pro has 3.