GPT-5.5 Pro: benchmarks, price and rank
GPT-5.5 Pro from OpenAI is 12th of 123 rated AI models on Spezia's leaderboard, strongest on BrowseComp. It costs $30 in, $180 out per million tokens.
- 12th of 123 rated models
- Rating 1,769
- Rated on 7 benchmarks
- Closed
- Released Apr 23, 2026
- 1.1 million tokens of context
- Knows the world to December 2025
Where it is strongest
- 6th of 56 on BrowseComp
Where it falls behind
In the top half on every benchmark it has a result on.
Price: $30 in, $180 out per million tokens.
Its headline results
The benchmarks that count most in the rating, with its place among the models measured the same way, and where each number came from.
- BrowseComp90.1%
Questions whose answers are hidden deep on the web and take many searches and pages to track down.
6th of 56. The maker's own number, from OpenAI, via LLM Stats.
- Humanity's Last Exam57.2%
About 2,500 questions written by experts in more than a hundred fields to be as hard as they could make them, many needing a diagram or image.
9th of 74. The maker's own number, from OpenAI, via LLM Stats.
- SimpleBench76.9%
Multiple-choice puzzles about everyday situations, space, time and people, written to trip up models that pattern-match instead of think. Ordinary adults do well on them.
13th of 68. Independent result from Epoch AI.
- FrontierMath87.7%
Hundreds of new, unpublished math problems written by mathematicians, from hard undergraduate level up to research, with answers a computer can check.
11th of 76. Independent result from Epoch AI.
- GPQA Diamond93.9%
Graduate-level questions in biology, physics and chemistry, written by PhDs so that searching the web does not give the answer away.
16th of 103. Independent result from Epoch AI.
- ARC-AGI-284.6%
Visual puzzles of colored grids, each with a new rule to work out from a few examples.
14th of 69. Independent result from Epoch AI.
- FrontierMath Tier 478.0%
Research-level problems that take professional mathematicians days.
13th of 66. Independent result from Epoch AI.
- Epoch Capabilities Index162.7
One score built from dozens of benchmarks, set on a common scale so that models tested on different benchmarks can still be compared.
14th of 94. Independent result from Epoch AI.
Its full profile is in Spezia.
Every result with its source, what it costs per task, what jumped with its release, side by side with any other model, and answers to your questions about when to use it.
Models ranked near it
How the rating works, and every benchmark it uses: the model leaderboard.