Gemini 2.5 Pro vs Gemini 3.5 Flash
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
Gemini 3.5 Flash is the stronger all-rounder.
Scores updated · 30 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 thinking05Gemini 3.5 Flash5 of 5 tests
- CodingWriting and fixing software04Gemini 3.5 Flash4 of 4 tests
- AgentsCarrying out multi-step tasks on its own03Gemini 3.5 Flash3 of 3 tests
- FactsGetting facts right instead of making them up03Gemini 3.5 Flash3 of 3 tests
- Images and chartsUnderstanding pictures, charts and video03Gemini 3.5 Flash3 of 3 tests
- MathCompetition and research-level math02Gemini 3.5 Flash2 of 2 tests
- Long documentsFinding answers in very long texts01Gemini 3.5 Flash1 of 1 test
- Following instructionsDoing exactly what it is asked01Gemini 3.5 Flash1 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 3.5 Flash costs 7% 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 3.5 Flash pulls ahead
- Abstract visual puzzles that people can solveARC-AGI-2+67.2points ahead
- Command-line tasks in a real terminalTerminal-Bench 2.1+50.2points ahead
- Unpublished advanced math problemsFrontierMath Tiers 1-3 (v2)+38.2points ahead
Where Gemini 2.5 Pro pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 30 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGemini 3.5 Flash
- Terminal-Bench 2.1Gemini 3.5 Flash by 50.228.578.7+50.2
- LMArena · WebDevGemini 3.5 Flash by 275 rating points12241499+275 rating
- Terminal-Bench HardGemini 3.5 Flash by 14.426.540.9+14.4
- SciCodeGemini 3.5 Flash by 7.646.353.9+7.6
AgentsGemini 3.5 Flash
- GDPValGemini 3.5 Flash by 35.2035.2+35.2
- τ-Bench V3 · BankingGemini 3.5 Flash by 22.59.732.2+22.5
- Terminal-Bench 4.0Gemini 3.5 Flash by 6.606.6+6.6
ReasoningGemini 3.5 Flash
- ARC-AGI-2Gemini 3.5 Flash by 67.24.972.1+67.2
- SimpleBenchGemini 3.5 Flash by 25.151.676.7+25.1
- Humanity's Last ExamGemini 3.5 Flash by 24.71842.7+24.7
- CritPtGemini 3.5 Flash by 10.52.613.1+10.5
- GPQA DiamondGemini 3.5 Flash by 8.683.692.2+8.6
FactsGemini 3.5 Flash
- AA-Omniscience · Non-hallucinationGemini 3.5 Flash by 28.79.137.8+28.7
- AA-Omniscience · AccuracyGemini 3.5 Flash by 12.33951.4+12.3
- SimpleQA VerifiedGemini 3.5 Flash by 10.25666.2+10.2
Images and chartsGemini 3.5 Flash
- MMMU-ProGemini 3.5 Flash by 9.474.984.3+9.4
- LMArena · VisionGemini 3.5 Flash by 47 rating points12631310+47 rating
- Video-MMEGemini 3.5 Flash by 2.484.887.2+2.4
MathGemini 3.5 Flash
- FrontierMath Tiers 1-3 (v2)Gemini 3.5 Flash by 38.224.662.8+38.2
- FrontierMath Tier 4Gemini 3.5 Flash by 26.8026.8+26.8
Following instructionsGemini 3.5 Flash
- IFBenchGemini 3.5 Flash by 27.648.776.3+27.6
Other results8 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-1Gemini 3.5 Flash by 55.53792.5+55.5
- τ²-Bench Telecom (AA run)Gemini 3.5 Flash by 41.254.195.3+41.2
- AA-OmniscienceGemini 3.5 Flash by 37.5-16.421.2+37.5
- AA Agentic IndexGemini 3.5 Flash by 23.83.527.3+23.8
- Artificial Analysis Coding IndexGemini 3.5 Flash by 23.446.770.1+23.4
- AA IntelligenceGemini 3.5 Flash by 17.61532.6+17.6
- matharena_visual_math_overallGemini 3.5 Flash by 12.777.289.9+12.7
- frontiermath_tier_4_v1Gemini 3.5 Flash by 10.44.214.6+10.4
Questions people ask
Which is better, Gemini 2.5 Pro or Gemini 3.5 Flash?
Gemini 3.5 Flash 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.
Which is better for coding?
Gemini 3.5 Flash. 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; Gemini 3.5 Flash costs $1.50 and $9.00. That makes Gemini 3.5 Flash about 7% cheaper for the same work.
How do you compare the two?
We use the 30 benchmark tests both models have published scores on. The verdict counts the 22 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 8 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.