Gemini 3.1 Pro vs o4-mini
Wins 7 of 8 areas
Coding · Reasoning · Facts · Images and charts · Math · Long documents · Following instructions
Wins 0 of 8 areas
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Gemini 3.1 Pro is the stronger all-rounder.o4-mini is cheaper.
Scores updated · 34 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 thinking40Gemini 3.1 Pro4 of 4 tests
- FactsGetting facts right instead of making them up40Gemini 3.1 Pro4 of 4 tests
- Images and chartsUnderstanding pictures, charts and video40Gemini 3.1 Pro4 of 4 tests
- CodingWriting and fixing software30Gemini 3.1 Pro3 of 3 tests
- MathCompetition and research-level math20Gemini 3.1 Pro2 of 2 tests
- Following instructionsDoing exactly what it is asked20Gemini 3.1 Pro2 of 2 tests
- Long documentsFinding answers in very long texts10Gemini 3.1 Pro1 of 1 test
- AgentsCarrying out multi-step tasks on its own11Even1 each
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.
o4-mini costs 61% 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
- Abstract visual puzzles that people can solveARC-AGI-2+71points ahead
- Short factual questions, answered correctlySimpleQA Verified+54.7points ahead
- Hard command-line tasks in a real terminalTerminal-Bench Hard+38.6points ahead
Where o4-mini pulls ahead
- Real work tasks from 44 professionsGDPVal+10.7points ahead
Every test, side by side
All 34 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGemini 3.1 Pro
- Terminal-Bench HardGemini 3.1 Pro by 38.653.815.2+38.6
- SWE-bench VerifiedGemini 3.1 Pro by 12.580.668.1+12.5
- SciCodeGemini 3.1 Pro by 12.258.746.5+12.2
AgentsEven
- BrowseCompGemini 3.1 Pro by 34.485.951.5+34.4
- GDPValo4-mini by 10.714.725.4+10.7
ReasoningGemini 3.1 Pro
- ARC-AGI-2Gemini 3.1 Pro by 7177.16.1+71
- Humanity's Last ExamGemini 3.1 Pro by 30.54716.5+30.5
- CritPtGemini 3.1 Pro by 17.117.70.6+17.1
- GPQA DiamondGemini 3.1 Pro by 15.794.178.4+15.7
FactsGemini 3.1 Pro
- SimpleQA VerifiedGemini 3.1 Pro by 54.773.518.8+54.7
- AA-Omniscience · AccuracyGemini 3.1 Pro by 30.154.924.8+30.1
- AA-Omniscience · Non-hallucinationGemini 3.1 Pro by 29.649.119.5+29.6
- Vectara HHEM hallucination ratelower is betterGemini 3.1 Pro by 8.210.418.6+8.2
Images and chartsGemini 3.1 Pro
- MMMU-ProGemini 3.1 Pro by 13.282.469.2+13.2
- CharXiv (RQ)Gemini 3.1 Pro by 11.383.372+11.3
- LMArena · VisionGemini 3.1 Pro by 102 rating points12961194+102 rating
- MathVistaGemini 3.1 Pro by 5.990.284.3+5.9
MathGemini 3.1 Pro
- FrontierMath Tiers 1-3 (v2)Gemini 3.1 Pro by 23.659.636.1+23.6
- FrontierMath Tier 4Gemini 3.1 Pro by 21.926.84.9+21.9
Following instructionsGemini 3.1 Pro
- Multi-ChallengeGemini 3.1 Pro by 28.471.443+28.4
- IFBenchGemini 3.1 Pro by 8.477.168.7+8.4
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.
- AA-OmniscienceGemini 3.1 Pro by 67.631.9-35.7+67.6
- Artificial Analysis Coding IndexGemini 3.1 Pro by 43.268.825.6+43.2
- τ²-Bench Telecom (AA run)Gemini 3.1 Pro by 4095.655.6+40
- ARC-AGI-1Gemini 3.1 Pro by 39.39858.7+39.3
- AA Agentic Indexo4-mini by 25.810.336.1+25.8
- LiveCodeBenchGemini 3.1 Pro by 14.391.777.4+14.3
- AA IntelligenceGemini 3.1 Pro by 1329.716.7+13
- frontiermath_tier_4_v1Gemini 3.1 Pro by 10.416.76.3+10.4
- vectara_factual_consistencyGemini 3.1 Pro by 8.289.681.4+8.2
- StrongREJECTGemini 3.1 Pro by 29896+2
- vectara_avg_summary_lengtho4-mini by 20 rating points107.7127.7+20 rating
- vectara_answer_ratetie99.499.2tie
Questions people ask
Which is better, Gemini 3.1 Pro or o4-mini?
Gemini 3.1 Pro wins seven of the eight areas we test: coding, reasoning, facts, images and charts, math, long documents and following instructions. o4-mini wins none, but costs 61% less. They are level on agents.
Which is better for coding?
Gemini 3.1 Pro. It wins 3 of the 3 coding tests both models report; o4-mini wins none.
Which is cheaper?
Gemini 3.1 Pro costs $2.00 per million input tokens and $12.00 per million output tokens; o4-mini costs $1.10 and $4.40. That makes o4-mini about 61% cheaper for the same work.
How do you compare the two?
We use the 34 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 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.