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Gemini 3.1 Pro vs Gemini 3.5 Flash Lite

Google · released

Wins 7 of 8 areas

Coding · Agents · Reasoning · Images and charts · Math · Long documents · Following instructions

Google · released

Wins 0 of 8 areas

—

Gemini 3.1 Pro is the stronger all-rounder.Gemini 3.5 Flash Lite is cheaper.

Scores updated · 40 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.

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 3.1 Pro$2.00 to read · $12.00 to write$14Price from Google's own price page
Gemini 3.5 Flash Lite$0.30 to read · $2.50 to write$2.80Price from Google's own price page

Gemini 3.5 Flash Lite costs 80% less for the same work.

The biggest differences

The three tests each model wins by the widest margin. Scores are out of 100.

Where Gemini 3.1 Pro pulls ahead

  • Abstract visual puzzles that people can solveARC-AGI-2+66.8points aheadGemini 3.1 Pro77.1Gemini 3.5 Flash Lite10.3
  • Unpublished advanced math problemsFrontierMath Tiers 1-3 (v2)+33.7points aheadGemini 3.1 Pro59.6Gemini 3.5 Flash Lite26
  • Harvard-MIT high-school math contest problemsHMMT Feb. 2026+31.1points aheadGemini 3.1 Pro94.7Gemini 3.5 Flash Lite63.6

Where Gemini 3.5 Flash Lite pulls ahead

  • Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+16.5points aheadGemini 3.5 Flash Lite65.6Gemini 3.1 Pro49.1
  • Real work tasks from 44 professionsGDPVal+9.6points aheadGemini 3.5 Flash Lite24.3Gemini 3.1 Pro14.7
  • Fixes real GitHub issues, working as an agentLiveBench · Agentic Coding+1.2points aheadGemini 3.5 Flash Lite45.3Gemini 3.1 Pro44.1

Every test, side by side

All 40 tests both models report. The winning score is in its model's colour; marks a score checked independently.

CodingGemini 3.1 Pro

Full coding ranking

AgentsGemini 3.1 Pro

Full agents ranking

ReasoningGemini 3.1 Pro

Full reasoning ranking

FactsEven

Full facts ranking

Images and chartsGemini 3.1 Pro

Full images and charts ranking

MathGemini 3.1 Pro

Full math ranking

Long documentsGemini 3.1 Pro
  • AA-LCRGemini 3.1 Pro by 68276+6

Full long documents ranking

Following instructionsGemini 3.1 Pro

Full following instructions ranking

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.

Questions people ask

Which is better, Gemini 3.1 Pro or Gemini 3.5 Flash Lite?

Gemini 3.1 Pro wins seven of the eight areas we test: coding, agents, reasoning, images and charts, math, long documents and following instructions. Gemini 3.5 Flash Lite wins none, but costs 80% less. They are level on facts.

Which is better for coding?

Gemini 3.1 Pro. It wins 3 of the 7 coding tests both models report; Gemini 3.5 Flash Lite wins 1, and 3 are ties.

Which is cheaper?

Gemini 3.1 Pro costs $2.00 per million input tokens and $12.00 per million output tokens; Gemini 3.5 Flash Lite costs $0.30 and $2.50. That makes Gemini 3.5 Flash Lite about 80% cheaper for the same work.

How do you compare the two?

We use the 40 benchmark tests both models have published scores on. The verdict counts the 28 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.

Compare Gemini 3.1 Pro with

Google

Across the field

All comparisons