Gemini 3.1 Flash Lite Preview vs Gemini 3.1 Pro
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 3.1 Pro is the stronger all-rounder.Gemini 3.1 Flash Lite Preview is cheaper.
Scores updated · 33 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.
- CodingWriting and fixing software04Gemini 3.1 Pro4 of 4 tests
- AgentsCarrying out multi-step tasks on its own04Gemini 3.1 Pro4 of 4 tests
- ReasoningHard problems that need careful thinking03Gemini 3.1 Pro3 of 3 tests
- Images and chartsUnderstanding pictures, charts and video03Gemini 3.1 Pro3 of 3 tests
- FactsGetting facts right instead of making them up12Gemini 3.1 Pro2 of 3 tests
- Following instructionsDoing exactly what it is asked01Gemini 3.1 Pro1 of 2 tests · 1 tie
- MathCompetition and research-level math01Gemini 3.1 Pro1 of 1 test
- Long documentsFinding answers in very long texts01Gemini 3.1 Pro1 of 1 test
Math and long documents 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 3.1 Flash Lite Preview costs 88% 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 3.1 Pro pulls ahead
- Command-line tasks in a real terminalTerminal-Bench 2.1+42.7points ahead
- Unpublished advanced math problemsFrontierMath Tiers 1-3 (v2)+32points ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+31.8points ahead
Where Gemini 3.1 Flash Lite Preview pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 33 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGemini 3.1 Pro
- Terminal-Bench 2.1Gemini 3.1 Pro by 42.731.173.8+42.7
- Terminal-Bench HardGemini 3.1 Pro by 29.624.253.8+29.6
- LMArena · WebDevGemini 3.1 Pro by 192 rating points12541446+192 rating
- SciCodeGemini 3.1 Pro by 15.343.458.7+15.3
AgentsGemini 3.1 Pro
- AA ApexAgentsGemini 3.1 Pro by 19.812.232+19.8
- GDPValGemini 3.1 Pro by 14.7014.7+14.7
- τ-Bench V3 · BankingGemini 3.1 Pro by 11.79.721.4+11.7
- Terminal-Bench 4.0Gemini 3.1 Pro by 3.50.54+3.5
ReasoningGemini 3.1 Pro
- Humanity's Last ExamGemini 3.1 Pro by 29.817.247+29.8
- CritPtGemini 3.1 Pro by 16.61.117.7+16.6
- GPQA DiamondGemini 3.1 Pro by 11.982.294.1+11.9
FactsGemini 3.1 Pro
- AA-Omniscience · Non-hallucinationGemini 3.1 Pro by 31.817.349.1+31.8
- AA-Omniscience · AccuracyGemini 3.1 Pro by 18.636.354.9+18.6
- Vectara HHEM hallucination ratelower is betterGemini 3.1 Flash Lite Preview by 2.28.210.4+2.2
Images and chartsGemini 3.1 Pro
- CharXiv (RQ)Gemini 3.1 Pro by 10.173.283.3+10.1
- MMMU-ProGemini 3.1 Pro by 6.975.582.4+6.9
- LMArena · VisionGemini 3.1 Pro by 56 rating points12401296+56 rating
Following instructionsGemini 3.1 Pro
- Multi-ChallengeGemini 3.1 Pro by 10.860.671.4+10.8
- IFBenchtie77.277.1tie
Other results12 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.
- τ²-Bench Telecom (AA run)Gemini 3.1 Pro by 64.331.395.6+64.3
- AA-OmniscienceGemini 3.1 Pro by 48.3-16.431.9+48.3
- Artificial Analysis Coding IndexGemini 3.1 Pro by 34.134.768.8+34.1
- GDPval-AA v2Gemini 3.1 Pro by 320 rating points642962+320 rating
- AA IntelligenceGemini 3.1 Pro by 14.115.629.7+14.1
- Finance Agent v2Gemini 3.1 Pro by 133043+13
- AA Agentic IndexGemini 3.1 Pro by 7.13.210.3+7.1
- vectara_avg_summary_lengthGemini 3.1 Pro by 45.1 rating points62.6107.7+45.1 rating
- MMMLUGemini 3.1 Pro by 3.788.992.6+3.7
- vectara_factual_consistencyGemini 3.1 Flash Lite Preview by 2.291.889.6+2.2
- vectara_answer_ratetie99.699.4tie
- Legal Agent Benchmarktie00tie
Questions people ask
Which is better, Gemini 3.1 Flash Lite Preview or Gemini 3.1 Pro?
Gemini 3.1 Pro wins all eight areas we test: coding, agents, reasoning, facts, images and charts, math, long documents and following instructions. Gemini 3.1 Flash Lite Preview wins none, but costs 88% less.
Which is better for coding?
Gemini 3.1 Pro. It wins 4 of the 4 coding tests both models report; Gemini 3.1 Flash Lite Preview wins none.
Which is cheaper?
Gemini 3.1 Flash Lite Preview costs $0.25 per million input tokens and $1.50 per million output tokens; Gemini 3.1 Pro costs $2.00 and $12.00. That makes Gemini 3.1 Flash Lite Preview about 88% cheaper for the same work.
How do you compare the two?
We use the 33 benchmark tests both models have published scores on. The verdict counts the 21 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 12 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.