Claude Opus 4.5 vs GPT-5.4 Pro
Wins 0 of 5 areas
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Wins 5 of 5 areas
Agents · Reasoning · Facts · Math · Following instructions
GPT-5.4 Pro is the stronger all-rounder.Claude Opus 4.5 is cheaper.
Scores updated · 17 tests both models report · How we compare
Where each one wins
Tests won in each of the five 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.
- ReasoningHard problems that need careful thinking04GPT-5.4 Pro4 of 4 tests
- MathCompetition and research-level math02GPT-5.4 Pro2 of 2 tests
- FactsGetting facts right instead of making them up01GPT-5.4 Pro1 of 2 tests · 1 tie
- AgentsCarrying out multi-step tasks on its own01GPT-5.4 Pro1 of 1 test
- Following instructionsDoing exactly what it is asked01GPT-5.4 Pro1 of 1 test
Agents and following instructions 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.
Claude Opus 4.5 costs 86% 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-5.4 Pro pulls ahead
- Extremely hard research-level math problemsFrontierMath Tier 4+53.6points ahead
- Finds hard-to-locate facts by browsing the webBrowseComp+52.3points ahead
- Unpublished advanced math problemsFrontierMath Tiers 1-3 (v2)+48.1points ahead
Where Claude Opus 4.5 pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 17 tests both models report. The winning score is in its model's colour; marks a score checked independently.
ReasoningGPT-5.4 Pro
- ARC-AGI-2GPT-5.4 Pro by 45.737.683.3+45.7
- CritPtGPT-5.4 Pro by 25.44.630+25.4
- Humanity's Last ExamGPT-5.4 Pro by 12.630.142.7+12.6
- GPQA DiamondGPT-5.4 Pro by 7.886.694.4+7.8
FactsGPT-5.4 Pro
- Vectara HHEM hallucination ratelower is betterGPT-5.4 Pro by 2.610.98.3+2.6
- SimpleQA Verifiedtie45.746.3tie
MathGPT-5.4 Pro
- FrontierMath Tier 4GPT-5.4 Pro by 53.64.958.5+53.6
- FrontierMath Tiers 1-3 (v2)GPT-5.4 Pro by 48.134.482.5+48.1
Following instructionsGPT-5.4 Pro
- Multi-ChallengeGPT-5.4 Pro by 10.25969.2+10.2
Other results7 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.
- frontiermath_tier_4_v1GPT-5.4 Pro by 33.34.237.5+33.3
- HLE (with tools)GPT-5.4 Pro by 15.543.258.7+15.5
- ARC-AGI-1GPT-5.4 Pro by 12.58294.5+12.5
- Finance AgentGPT-5.4 Pro by 6.355.261.5+6.3
- vectara_avg_summary_lengthGPT-5.4 Pro by 34 rating points114.5148.5+34 rating
- vectara_factual_consistencyGPT-5.4 Pro by 2.689.191.7+2.6
- vectara_answer_rateGPT-5.4 Pro by 1.398.7100+1.3
Questions people ask
Which is better, Claude Opus 4.5 or GPT-5.4 Pro?
GPT-5.4 Pro wins all five areas where both have results: agents, reasoning, facts, math and following instructions. Claude Opus 4.5 wins none, but costs 86% less.
Which is cheaper?
Claude Opus 4.5 costs $5.00 per million input tokens and $25.00 per million output tokens; GPT-5.4 Pro costs $30.00 and $180.00. That makes Claude Opus 4.5 about 86% cheaper for the same work.
How do you compare the two?
We use the 17 benchmark tests both models have published scores on. The verdict counts the 10 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 7 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.