Gemini 3.1 Pro vs Grok 4.3
Wins 6 of 8 areas
Coding · Agents · Reasoning · Images and charts · Math · Long documents
Wins 0 of 8 areas
—
Gemini 3.1 Pro is the stronger all-rounder.Grok 4.3 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 software60Gemini 3.1 Pro6 of 6 tests
- ReasoningHard problems that need careful thinking40Gemini 3.1 Pro4 of 4 tests
- Images and chartsUnderstanding pictures, charts and video20Gemini 3.1 Pro2 of 2 tests
- AgentsCarrying out multi-step tasks on its own32Gemini 3.1 Pro3 of 5 tests
- MathCompetition and research-level math10Gemini 3.1 Pro1 of 1 test
- Long documentsFinding answers in very long texts10Gemini 3.1 Pro1 of 1 test
- FactsGetting facts right instead of making them up11Even1 each
- Following instructionsDoing exactly what it is asked11Even1 each
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.
Grok 4.3 costs 73% 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
- Command-line tasks in a real terminalTerminal-Bench 2.1+34.1points ahead
- Fixes real GitHub issues, working as an agentLiveBench · Agentic Coding+25.6points ahead
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+20.1points ahead
Where Grok 4.3 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+25.1points ahead
- Real work tasks from 44 professionsGDPVal+7.3points ahead
- Follows unfamiliar, precisely checkable instructionsIFBench+4.2points ahead
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 34.173.839.7+34.1
- LiveBench · Agentic CodingGemini 3.1 Pro by 25.644.118.5+25.6
- Terminal-Bench HardGemini 3.1 Pro by 15.953.837.9+15.9
- SciCodeGemini 3.1 Pro by 10.458.748.3+10.4
- LMArena · WebDevGemini 3.1 Pro by 90 rating points14471357+90 rating
- LiveBench · CodingGemini 3.1 Pro by 6.676.569.9+6.6
AgentsGemini 3.1 Pro
- AA ApexAgentsGemini 3.1 Pro by 153217+15
- τ-Bench V3 · BankingGemini 3.1 Pro by 921.412.4+9
- GDPValGrok 4.3 by 7.314.722+7.3
- Terminal-Bench 4.0Gemini 3.1 Pro by 440+4
- AA IT-Bench SREGrok 4.3 by 2.430.332.7+2.4
ReasoningGemini 3.1 Pro
- LiveBench · ReasoningGemini 3.1 Pro by 13.28470.8+13.2
- Humanity's Last ExamGemini 3.1 Pro by 9.84737.2+9.8
- CritPtGemini 3.1 Pro by 9.717.78+9.7
- GPQA DiamondGemini 3.1 Pro by 494.190.1+4
FactsEven
- AA-Omniscience · Non-hallucinationGrok 4.3 by 25.149.174.2+25.1
- AA-Omniscience · AccuracyGemini 3.1 Pro by 20.154.934.8+20.1
Images and chartsGemini 3.1 Pro
- LMArena · VisionGemini 3.1 Pro by 67 rating points12961229+67 rating
- MMMU-ProGemini 3.1 Pro by 4.382.478.1+4.3
Following instructionsEven
- LiveBench · Instruction FollowingGemini 3.1 Pro by 16.379.162.8+16.3
- IFBenchGrok 4.3 by 4.277.181.3+4.2
Other results10 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.
- Artificial Analysis Coding IndexGemini 3.1 Pro by 26.668.842.2+26.6
- livebench_data_analysisGemini 3.1 Pro by 22.778.555.8+22.7
- AA-OmniscienceGemini 3.1 Pro by 13.931.918+13.9
- livebench_languageGemini 3.1 Pro by 11.885.473.6+11.8
- AA Agentic IndexGrok 4.3 by 6.910.317.2+6.9
- Finance Agent v2Gemini 3.1 Pro by 5.34337.7+5.3
- AA IntelligenceGemini 3.1 Pro by 4.829.724.9+4.8
- τ²-Bench Telecom (AA run)Grok 4.3 by 2.195.697.7+2.1
- ForecastBench with searchtie61.961.3tie
- Prophet Arenatie0.10.1tie
Questions people ask
Which is better, Gemini 3.1 Pro or Grok 4.3?
Gemini 3.1 Pro wins six of the eight areas we test: coding, agents, reasoning, images and charts, math and long documents. Grok 4.3 wins none, but costs 73% less. They are level on facts and following instructions.
Which is better for coding?
Gemini 3.1 Pro. It wins 6 of the 6 coding tests both models report; Grok 4.3 wins none.
Which is cheaper?
Gemini 3.1 Pro costs $2.00 per million input tokens and $12.00 per million output tokens; Grok 4.3 costs $1.25 and $2.50. That makes Grok 4.3 about 73% 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 23 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 10 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.