Gemini 2.5 Pro vs GPT-4.1 nano
Wins 7 of 7 areas
Coding · Agents · Reasoning · Facts · Images and charts · Long documents · Following instructions
Wins 0 of 7 areas
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Gemini 2.5 Pro is the stronger all-rounder.GPT-4.1 nano is cheaper.
Scores updated · 32 tests both models report · How we compare
Where each one wins
Tests won in each of the seven 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 thinking40Gemini 2.5 Pro4 of 4 tests
- CodingWriting and fixing software30Gemini 2.5 Pro3 of 3 tests
- Images and chartsUnderstanding pictures, charts and video30Gemini 2.5 Pro3 of 3 tests
- Following instructionsDoing exactly what it is asked20Gemini 2.5 Pro2 of 2 tests
- FactsGetting facts right instead of making them up21Gemini 2.5 Pro2 of 3 tests
- AgentsCarrying out multi-step tasks on its own10Gemini 2.5 Pro1 of 2 tests · 1 tie
- Long documentsFinding answers in very long texts10Gemini 2.5 Pro1 of 1 test
Long documents 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.
GPT-4.1 nano costs 96% 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 Gemini 2.5 Pro pulls ahead
- Short factual questions, answered correctlySimpleQA Verified+50points ahead
- Reasons across sets of long documentsAA-LCR+48.7points ahead
- Keeps track of context across a multi-turn chatMulti-Challenge+38.6points ahead
Where GPT-4.1 nano pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+8.3points ahead
Every test, side by side
All 32 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGemini 2.5 Pro
- Terminal-Bench 2.1Gemini 2.5 Pro by 24.828.53.7+24.8
- Terminal-Bench HardGemini 2.5 Pro by 22.726.53.8+22.7
- SciCodeGemini 2.5 Pro by 20.446.325.9+20.4
AgentsGemini 2.5 Pro
- τ-Bench V3 · BankingGemini 2.5 Pro by 6.29.73.5+6.2
- GDPValtie00tie
ReasoningGemini 2.5 Pro
- GPQA DiamondGemini 2.5 Pro by 32.483.651.2+32.4
- Humanity's Last ExamGemini 2.5 Pro by 14.2183.8+14.2
- ARC-AGI-2Gemini 2.5 Pro by 4.94.90+4.9
- CritPtGemini 2.5 Pro by 2.62.60+2.6
FactsGemini 2.5 Pro
- SimpleQA VerifiedGemini 2.5 Pro by 50566+50
- AA-Omniscience · AccuracyGemini 2.5 Pro by 25.43913.7+25.4
- AA-Omniscience · Non-hallucinationGPT-4.1 nano by 8.39.117.4+8.3
Images and chartsGemini 2.5 Pro
Following instructionsGemini 2.5 Pro
- Multi-ChallengeGemini 2.5 Pro by 38.653.615+38.6
- IFBenchGemini 2.5 Pro by 16.748.732+16.7
Other results14 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.
- Aider-PolyglotGemini 2.5 Pro by 66.776.59.8+66.7
- TAU-bench (retail)Gemini 2.5 Pro by 44.46722.6+44.4
- AA-OmniscienceGemini 2.5 Pro by 41.3-16.4-57.6+41.3
- ARC-AGI-1Gemini 2.5 Pro by 37370+37
- τ²-Bench Telecom (AA run)Gemini 2.5 Pro by 36.854.117.3+36.8
- TAU-bench (airline)Gemini 2.5 Pro by 365014+36
- Artificial Analysis Coding IndexGemini 2.5 Pro by 35.646.711.1+35.6
- HarmBenchGPT-4.1 nano by 21.465.486.8+21.4
- AIR-Bench 2024Gemini 2.5 Pro by 12.173.661.5+12.1
- bbqGemini 2.5 Pro by 8.996.487.5+8.9
- AA IntelligenceGemini 2.5 Pro by 7.2157.8+7.2
- XSTestGemini 2.5 Pro by 2.798.796+2.7
- simple_safety_testsGPT-4.1 nano by 29799+2
- anthropic_red_teamtie99.599.6tie
Questions people ask
Which is better, Gemini 2.5 Pro or GPT-4.1 nano?
Gemini 2.5 Pro wins all seven areas where both have results: coding, agents, reasoning, facts, images and charts, long documents and following instructions. GPT-4.1 nano wins none, but costs 96% less.
Which is better for coding?
Gemini 2.5 Pro. It wins 3 of the 3 coding tests both models report; GPT-4.1 nano wins none.
Which is cheaper?
Gemini 2.5 Pro costs $1.25 per million input tokens and $10.00 per million output tokens; GPT-4.1 nano costs $0.10 and $0.40. That makes GPT-4.1 nano about 96% cheaper for the same work.
How do you compare the two?
We use the 32 benchmark tests both models have published scores on. The verdict counts the 18 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 14 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.