GPT-5.5 Pro is the stronger all-rounder.GPT-5 is cheaper.
Scores updated · 11 tests both models report · How we compare
Where each one wins
Tests won in each of the four areas where both have results. Each piece is one test, so a longer bar means more evidence; grey means the two scored within a point of each other.
Agents and facts rest on a single test each.
What it costs
Prices per million tokens, roughly 750,000 words. The bars show the cost of a million tokens read plus a million written.
GPT-5 costs 95% less for the same work.
The biggest differences
The tests each model wins by the widest margin, up to three each. Scores are out of 100.
Where GPT-5.5 Pro pulls ahead
- Abstract visual puzzles that people can solveARC-AGI-2+74.3points ahead
- Extremely hard research-level math problemsFrontierMath Tier 4+56.1points ahead
- Finds hard-to-locate facts by browsing the webBrowseComp+35.2points ahead
Where GPT-5 pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 11 tests both models report. The winning score is in its model's colour; marks a score checked independently.
ReasoningGPT-5.5 Pro
- ARC-AGI-2GPT-5.5 Pro by 74.39.984.2+74.3
- Humanity's Last ExamGPT-5.5 Pro by 28.728.557.2+28.7
- CritPtGPT-5.5 Pro by 24.95.730.6+24.9
- SimpleBenchGPT-5.5 Pro by 20.256.776.9+20.2
MathGPT-5.5 Pro
- FrontierMath Tier 4GPT-5.5 Pro by 56.121.978+56.1
- FrontierMath Tiers 1-3 (v2)GPT-5.5 Pro by 32.355.487.7+32.3
Other results3 tests, not counted
Tests outside the eight areas. They are not counted above: several are summary scores built from other tests, or the same test under another name.
- ARC-AGI-1GPT-5.5 Pro by 29.365.795+29.3
- frontiermath_tier_4_v1GPT-5.5 Pro by 27.112.539.6+27.1
- FrontierMath (overall)GPT-5.5 Pro by 13.326.339.6+13.3
Questions people ask
Which is better, GPT-5 or GPT-5.5 Pro?
GPT-5.5 Pro wins all four areas where both have results: agents, reasoning, facts and math. GPT-5 wins none, but costs 95% less.
Which is cheaper?
GPT-5 costs $1.25 per million input tokens and $10.00 per million output tokens; GPT-5.5 Pro costs $30.00 and $180.00. That makes GPT-5 about 95% cheaper for the same work.
How do you compare the two?
We use the 11 benchmark tests both models have published scores on. The verdict counts the 8 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 3 are listed but not counted, because several are summary scores or repeat a test. Each score is the one shown on the model's own page.