Gemini 2.5 Flash vs Gemini 3 Pro
Wins 1 of 7 areas
Facts
Wins 6 of 7 areas
Coding · Agents · Reasoning · Images and charts · Long documents · Following instructions
Gemini 3 Pro is the stronger all-rounder.Gemini 2.5 Flash is cheaper and better at facts.
Scores updated · 37 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 thinking05Gemini 3 Pro5 of 5 tests
- CodingWriting and fixing software03Gemini 3 Pro3 of 3 tests
- Images and chartsUnderstanding pictures, charts and video02Gemini 3 Pro2 of 2 tests
- AgentsCarrying out multi-step tasks on its own01Gemini 3 Pro1 of 1 test
- Long documentsFinding answers in very long texts01Gemini 3 Pro1 of 1 test
- Following instructionsDoing exactly what it is asked01Gemini 3 Pro1 of 1 test
- FactsGetting facts right instead of making them up21Gemini 2.5 Flash2 of 3 tests
Agents, 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 Flash costs 80% 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 3 Pro pulls ahead
- Common-sense trick questionsSimpleBench+35.2points ahead
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+29.8points ahead
- Abstract visual puzzles that people can solveARC-AGI-2+28.6points ahead
Where Gemini 2.5 Flash pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+16.2points ahead
Every test, side by side
All 37 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGemini 3 Pro
- Terminal-Bench HardGemini 3 Pro by 28.113.641.7+28.1
- SciCodeGemini 3 Pro by 2729.156.1+27
- SWE-bench VerifiedGemini 3 Pro by 15.860.476.2+15.8
ReasoningGemini 3 Pro
- SimpleBenchGemini 3 Pro by 35.241.276.4+35.2
- ARC-AGI-2Gemini 3 Pro by 28.62.531.1+28.6
- Humanity's Last ExamGemini 3 Pro by 27.612.139.7+27.6
- GPQA DiamondGemini 3 Pro by 11.87990.8+11.8
- CritPtGemini 3 Pro by 81.19.1+8
FactsGemini 2.5 Flash
- AA-Omniscience · AccuracyGemini 3 Pro by 29.825.955.8+29.8
- AA-Omniscience · Non-hallucinationGemini 2.5 Flash by 16.224.78.5+16.2
- Vectara HHEM hallucination ratelower is betterGemini 2.5 Flash by 5.87.813.6+5.8
Images and chartsGemini 3 Pro
- MMMU-ProGemini 3 Pro by 11.169.180.2+11.1
- LMArena · VisionGemini 3 Pro by 70 rating points12351305+70 rating
Following instructionsGemini 3 Pro
- IFBenchGemini 3 Pro by 20.150.370.4+20.1
Other results21 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.
- MRCRGemini 3 Pro by 57.73289.7+57.7
- τ²-Bench Telecom (AA run)Gemini 3 Pro by 55.531.687.1+55.5
- SimpleQAGemini 3 Pro by 45.226.972.1+45.2
- AA-OmniscienceGemini 3 Pro by 45.1-29.815.3+45.1
- ARC-AGI-1Gemini 3 Pro by 42.732.375+42.7
- HMMT Feb. 2025Gemini 3 Pro by 33.364.297.5+33.3
- AA Agentic IndexGemini 3 Pro by 33.218.852+33.2
- AIME 2025Gemini 3 Pro by 2872100+28
- Artificial Analysis Coding IndexGemini 3 Pro by 24.322.246.5+24.3
- LiveCodeBenchGemini 3 Pro by 15.876.292+15.8
- AA IntelligenceGemini 3 Pro by 14.913.128+14.9
- frontiermath_tier_4_v1Gemini 3 Pro by 14.64.218.8+14.6
- HarmBenchGemini 3 Pro by 9.962.672.5+9.9
- vectara_factual_consistencyGemini 2.5 Flash by 5.892.286.4+5.8
- AIR-Bench 2024Gemini 3 Pro by 4.568.773.2+4.5
- anthropic_red_teamGemini 2.5 Flash by 1.798.897+1.7
- XSTestGemini 2.5 Flash by 1.598.897.3+1.5
- bbqtie97.798.4tie
- simple_safety_teststie9897.5tie
- vectara_answer_ratetie9999.4tie
- vectara_avg_summary_lengthtie101.5101.9tie
Questions people ask
Which is better, Gemini 2.5 Flash or Gemini 3 Pro?
Gemini 3 Pro wins six of the seven areas where both have results: coding, agents, reasoning, images and charts, long documents and following instructions. Gemini 2.5 Flash wins facts, and costs 80% less.
Which is better for coding?
Gemini 3 Pro. It wins 3 of the 3 coding tests both models report; Gemini 2.5 Flash wins none.
Which is cheaper?
Gemini 2.5 Flash costs $0.30 per million input tokens and $2.50 per million output tokens; Gemini 3 Pro costs $2.00 and $12.00. That makes Gemini 2.5 Flash about 80% cheaper for the same work.
How do you compare the two?
We use the 37 benchmark tests both models have published scores on. The verdict counts the 16 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 21 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.