The two are evenly matched.Claude Opus 4.5 is better at reasoning; GPT-5 Pro at math.
Scores updated · 5 tests both models report · How we compare
Where each one wins
Tests won in each of the two 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.
Reasoning rests on a single test.
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.
Claude Opus 4.5 costs 78% 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 Pro pulls ahead
- Unpublished advanced math problemsFrontierMath Tiers 1-3 (v2)+21.4points ahead
- Extremely hard research-level math problemsFrontierMath Tier 4+14.6points ahead
Where Claude Opus 4.5 pulls ahead
- Abstract visual puzzles that people can solveARC-AGI-2+19.3points ahead
Every test, side by side
All 5 tests both models report. The winning score is in its model's colour; marks a score checked independently.
MathGPT-5 Pro
- FrontierMath Tiers 1-3 (v2)GPT-5 Pro by 21.434.455.8+21.4
- FrontierMath Tier 4GPT-5 Pro by 14.64.919.5+14.6
Other results2 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-1Claude Opus 4.5 by 11.88270.2+11.8
- frontiermath_tier_4_v1GPT-5 Pro by 10.44.214.6+10.4
Questions people ask
Which is better, Claude Opus 4.5 or GPT-5 Pro?
Claude Opus 4.5 and GPT-5 Pro each win one of the two areas where both have results. Claude Opus 4.5 wins reasoning; GPT-5 Pro wins math. Claude Opus 4.5 costs 78% less.
Which is cheaper?
Claude Opus 4.5 costs $5.00 per million input tokens and $25.00 per million output tokens; GPT-5 Pro costs $15.00 and $120.00. That makes Claude Opus 4.5 about 78% cheaper for the same work.
How do you compare the two?
We use the 5 benchmark tests both models have published scores on. The verdict counts the 3 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 2 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.