Gemini 3.1 Pro vs Grok4.5
Wins 5 of 8 areas
Reasoning · Facts · Images and charts · Math · Following instructions
Wins 2 of 8 areas
Coding · Agents
Gemini 3.1 Pro is the stronger all-rounder.Grok4.5 is cheaper and better at agents.
Scores updated · 41 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 thinking51Gemini 3.1 Pro5 of 7 tests · 1 tie
- FactsGetting facts right instead of making them up30Gemini 3.1 Pro3 of 3 tests
- Images and chartsUnderstanding pictures, charts and video20Gemini 3.1 Pro2 of 3 tests · 1 tie
- MathCompetition and research-level math20Gemini 3.1 Pro2 of 3 tests · 1 tie
- Following instructionsDoing exactly what it is asked10Gemini 3.1 Pro1 of 1 test
- AgentsCarrying out multi-step tasks on its own03Grok4.53 of 3 tests
- CodingWriting and fixing software24Grok4.54 of 6 tests
- Long documentsFinding answers in very long texts11Even1 each
Following instructions 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.
Grok4.5 costs 43% 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
- Short factual questions, answered correctlySimpleQA Verified+25.2points ahead
- Abstract visual puzzles that people can solveARC-AGI-2+24.5points ahead
- Common-sense trick questionsSimpleBench+9.6points ahead
Where Grok4.5 pulls ahead
- Finds one of eight look-alike replies in a long chatMRCR v2 8 needle 128k (average)+55.1points ahead
- Real work tasks from 44 professionsGDPVal+29.8points ahead
- Customer-service tasks in a simulated bankτ-Bench V3 · Banking+20.7points ahead
Every test, side by side
All 41 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGrok4.5
- LiveBench · Agentic CodingGrok4.5 by 12.444.156.5+12.4
- LMArena · WebDevGrok4.5 by 106 rating points14471553+106 rating
- SWE-bench ProGrok4.5 by 10.554.264.7+10.5
- LiveBench · CodingGemini 3.1 Pro by 7.976.568.6+7.9
- Terminal-Bench 2.1Grok4.5 by 7.873.881.6+7.8
- SciCodeGemini 3.1 Pro by 3.758.755+3.7
AgentsGrok4.5
- GDPValGrok4.5 by 29.814.744.5+29.8
- τ-Bench V3 · BankingGrok4.5 by 20.721.442.1+20.7
- Terminal-Bench 4.0Grok4.5 by 6.6410.6+6.6
ReasoningGemini 3.1 Pro
- ARC-AGI-2Gemini 3.1 Pro by 24.577.152.6+24.5
- SimpleBenchGemini 3.1 Pro by 9.679.670+9.6
- Humanity's Last ExamGemini 3.1 Pro by 4.34742.7+4.3
- LiveBench · ReasoningGrok4.5 by 3.28487.2+3.2
- CritPtGemini 3.1 Pro by 2.317.715.4+2.3
- GPQA DiamondGemini 3.1 Pro by 194.193.1+1
- ARC-AGI-3tie0.40.3tie
FactsGemini 3.1 Pro
- SimpleQA VerifiedGemini 3.1 Pro by 25.273.548.3+25.2
- AA-Omniscience · AccuracyGemini 3.1 Pro by 3.354.951.5+3.3
- AA-Omniscience · Non-hallucinationGemini 3.1 Pro by 3.249.145.9+3.2
Images and chartsGemini 3.1 Pro
- MMMU-ProGemini 3.1 Pro by 282.480.4+2
- CharXiv (RQ)Gemini 3.1 Pro by 1.783.381.6+1.7
- LMArena · Visiontie12961288tie
MathGemini 3.1 Pro
- FrontierMath Tiers 1-3 (v2)Gemini 3.1 Pro by 2.559.657.2+2.5
- FrontierMath Tier 4Gemini 3.1 Pro by 2.426.824.4+2.4
- LiveBench · Mathematicstie9190.8tie
Long documentsEven
- MRCR v2 8 needle 128k (average)Grok4.5 by 55.126.381.4+55.1
- AA-LCRGemini 3.1 Pro by 2.78279.3+2.7
Following instructionsGemini 3.1 Pro
- LiveBench · Instruction FollowingGemini 3.1 Pro by 7.679.171.5+7.6
Other results13 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.
- GDPval-AA v2 EloGrok4.5 by 570 rating points9651535+570 rating
- DeepSWEGrok4.5 by 431053+43
- DeepSWE 1.1Grok4.5 by 421254+42
- AA Agentic IndexGrok4.5 by 31.810.342.1+31.8
- SWE-MarathonGrok4.5 by 25429+25
- τ³-Bench BankingGrok4.5 by 16.516.533+16.5
- ARC-AGI-1Gemini 3.1 Pro by 12.39885.7+12.3
- AA IntelligenceGrok4.5 by 9.129.738.8+9.1
- AA-OmniscienceGemini 3.1 Pro by 6.631.925.3+6.6
- livebench_data_analysisGemini 3.1 Pro by 5.578.573+5.5
- Artificial Analysis Coding IndexGrok4.5 by 3.668.872.4+3.6
- livebench_languageGemini 3.1 Pro by 2.685.482.8+2.6
- MLE-Benchtie42.643.2tie
Questions people ask
Which is better, Gemini 3.1 Pro or Grok4.5?
Gemini 3.1 Pro wins five of the eight areas we test: reasoning, facts, images and charts, math and following instructions. Grok4.5 wins coding and agents, and costs 43% less. They are level on long documents.
Which is better for coding?
Grok4.5. It wins 4 of the 6 coding tests both models report; Gemini 3.1 Pro wins 2.
Which is cheaper?
Gemini 3.1 Pro costs $2.00 per million input tokens and $12.00 per million output tokens; Grok4.5 costs $2.00 and $6.00. That makes Grok4.5 about 43% cheaper for the same work.
How do you compare the two?
We use the 41 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 13 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.