Model comparison
GPT-5.5 Pro vs o1-pro
Head-to-head evidence from 0 shared benchmark results across 0 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: GPT-5.5 Pro #38 (Estimated); o1-pro #141 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5.5 Pro and o1-pro share 0 comparable benchmark results. 1 of 8 categories are comparable. 7 results are unique to GPT-5.5 Pro; 2 to o1-pro.
Updated July 22, 2026- Shared results
- 0
- GPT-5.5 Pro only
- 7
- o1-pro only
- 2
- Comparable categories
- 1 / 8
Pick GPT-5.5 Pro if you want the stronger benchmark profile. o1-pro only becomes the better choice if knowledge is the priority.
Confidence note. This is a partial-evidence comparison with 0 shared benchmark results across 0 evidence categories; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
GPT-5.5 Pro is clearly ahead on the BenchAlign aggregate, 63.69 to 45.94. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
o1-pro is also the more expensive model on tokens at $150.00 input / $600.00 output per 1M tokens, versus $30.00 input / $180.00 output per 1M tokens for GPT-5.5 Pro. That is roughly 3.3x on output cost alone. GPT-5.5 Pro gives you the larger context window at 1M, compared with 200K for o1-pro.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-5.5 Pro | o1-pro | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5.5 Pro$30 input / $180 output | o1-pro$150 input / $600 output | GPT-5.5 Pro has the lower combined listed price. |
| Generation speedtokens per second | GPT-5.5 ProNot available | o1-proNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | GPT-5.5 ProNot available | o1-proNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | GPT-5.5 Pro1M | o1-pro200K | GPT-5.5 Pro lists the larger context window. |
Benchmark Deep Dive
Frequently Asked Questions (2)
Which is better, GPT-5.5 Pro or o1-pro?
GPT-5.5 Pro is ahead on BenchLM's BenchAlign leaderboard, 63.69 to 45.94.
Which is better for knowledge tasks, GPT-5.5 Pro or o1-pro?
o1-pro has the edge for knowledge tasks in this comparison, averaging 79 versus 57.2. GPT-5.5 Pro stays close enough that the answer can still flip depending on your workload.
Related Comparisons
Explore More
Choose a model with this week’s evidence
Join 2,000+ readers for ranking moves, pricing changes, and the claims that still need proof.
One email each week. Unsubscribe anytime.