Gemini 2.5 Pro vs GPT-5.5
Wins 0 of 8 areas
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Wins 8 of 8 areas
Coding · Agents · Reasoning · Facts · Images and charts · Math · Long documents · Following instructions
GPT-5.5 is the stronger all-rounder.Gemini 2.5 Pro is cheaper.
Scores updated · 38 tests both models report · How we compare
Where each one wins
Tests won in each of the eight areas we test. 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 thinking05GPT-5.55 of 5 tests
- CodingWriting and fixing software04GPT-5.54 of 4 tests
- AgentsCarrying out multi-step tasks on its own04GPT-5.54 of 4 tests
- Images and chartsUnderstanding pictures, charts and video03GPT-5.53 of 4 tests · 1 tie
- FactsGetting facts right instead of making them up13GPT-5.53 of 4 tests
- MathCompetition and research-level math02GPT-5.52 of 2 tests
- Long documentsFinding answers in very long texts01GPT-5.51 of 1 test
- Following instructionsDoing exactly what it is asked01GPT-5.51 of 1 test
Long documents 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.
Gemini 2.5 Pro costs 68% 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 pulls ahead
- Abstract visual puzzles that people can solveARC-AGI-2+80.1points ahead
- Finds hard-to-locate facts by browsing the webBrowseComp+74.5points ahead
- Unpublished advanced math problemsFrontierMath Tiers 1-3 (v2)+60.7points ahead
Where Gemini 2.5 Pro pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 38 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGPT-5.5
- Terminal-Bench 2.1GPT-5.5 by 55.828.584.3+55.8
- Terminal-Bench HardGPT-5.5 by 34.126.560.6+34.1
- LMArena · WebDevGPT-5.5 by 289 rating points12241513+289 rating
- SciCodeGPT-5.5 by 9.546.355.8+9.5
AgentsGPT-5.5
- BrowseCompGPT-5.5 by 74.59.984.4+74.5
- GDPValGPT-5.5 by 42.7042.7+42.7
- τ-Bench V3 · BankingGPT-5.5 by 29.39.739+29.3
- Terminal-Bench 4.0GPT-5.5 by 14.6014.6+14.6
ReasoningGPT-5.5
- ARC-AGI-2GPT-5.5 by 80.14.985+80.1
- Humanity's Last ExamGPT-5.5 by 27.81845.8+27.8
- CritPtGPT-5.5 by 24.52.627.1+24.5
- SimpleBenchGPT-5.5 by 17.451.669+17.4
- GPQA DiamondGPT-5.5 by 9.983.693.5+9.9
FactsGPT-5.5
- AA-Omniscience · AccuracyGPT-5.5 by 18.93958+18.9
- SimpleQA VerifiedGPT-5.5 by 75663+7
- Vectara HHEM hallucination ratelower is betterGemini 2.5 Pro by 2.379.3+2.3
- AA-Omniscience · Non-hallucinationGPT-5.5 by 1.99.111+1.9
Images and chartsGPT-5.5
- MMMU-ProGPT-5.5 by 574.979.9+5
- LMArena · VisionGPT-5.5 by 29 rating points12631292+29 rating
- OCRBenchv2GPT-5.5 by 1.859.361.1+1.8
- MathVistatie83.984.2tie
MathGPT-5.5
- FrontierMath Tier 4GPT-5.5 by 72.5072.5+72.5
- FrontierMath Tiers 1-3 (v2)GPT-5.5 by 60.724.685.3+60.7
Other results13 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 by 583795+58
- τ²-Bench Telecom (AA run)GPT-5.5 by 39.854.193.9+39.8
- AA-OmniscienceGPT-5.5 by 36.8-16.420.5+36.8
- AA Agentic IndexGPT-5.5 by 33.83.537.3+33.8
- frontiermath_tier_4_v1GPT-5.5 by 31.24.235.4+31.2
- Artificial Analysis Coding IndexGPT-5.5 by 28.246.774.9+28.2
- HLE (with tools)GPT-5.5 by 23.828.452.2+23.8
- AA IntelligenceGPT-5.5 by 23.41538.4+23.4
- matharena_visual_math_overallGPT-5.5 by 17.777.294.9+17.7
- HMMT Nov. 2025GPT-5.5 by 16.58096.5+16.5
- vectara_avg_summary_lengthGPT-5.5 by 23.2 rating points106.4129.6+23.2 rating
- vectara_factual_consistencyGemini 2.5 Pro by 2.39390.7+2.3
- vectara_answer_ratetie99.1100tie
Questions people ask
Which is better, Gemini 2.5 Pro or GPT-5.5?
GPT-5.5 wins all eight areas we test: coding, agents, reasoning, facts, images and charts, math, long documents and following instructions. Gemini 2.5 Pro wins none, but costs 68% less.
Which is better for coding?
GPT-5.5. It wins 4 of the 4 coding tests both models report; Gemini 2.5 Pro wins none.
Which is cheaper?
Gemini 2.5 Pro costs $1.25 per million input tokens and $10.00 per million output tokens; GPT-5.5 costs $5.00 and $30.00. That makes Gemini 2.5 Pro about 68% cheaper for the same work.
How do you compare the two?
We use the 38 benchmark tests both models have published scores on. The verdict counts the 25 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 13 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.