Gemini 3 Flash Preview vs Grok 4.1 Fast
Wins 8 of 8 areas
Coding · Agents · Reasoning · Facts · Images and charts · Math · Long documents · Following instructions
Wins 0 of 8 areas
—
Gemini 3 Flash Preview is the stronger all-rounder.Grok 4.1 Fast is cheaper.
Scores updated · 27 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 Flash Preview4 of 4 tests
- CodingWriting and fixing software30Gemini 3 Flash Preview3 of 3 tests
- Images and chartsUnderstanding pictures, charts and video20Gemini 3 Flash Preview2 of 2 tests
- MathCompetition and research-level math20Gemini 3 Flash Preview2 of 2 tests
- FactsGetting facts right instead of making them up21Gemini 3 Flash Preview2 of 3 tests
- AgentsCarrying out multi-step tasks on its own10Gemini 3 Flash Preview1 of 1 test
- Long documentsFinding answers in very long texts10Gemini 3 Flash Preview1 of 1 test
- Following instructionsDoing exactly what it is asked10Gemini 3 Flash Preview1 of 1 test
Agents, 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.
Grok 4.1 Fast costs 80% 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 Flash Preview pulls ahead
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+28.3points ahead
- Follows unfamiliar, precisely checkable instructionsIFBench+25.3points ahead
- Real work tasks from 44 professionsGDPVal+21.1points ahead
Where Grok 4.1 Fast pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+19.6points ahead
Every test, side by side
All 27 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGemini 3 Flash Preview
- LMArena · WebDevGemini 3 Flash Preview by 199 rating points14391240+199 rating
- Terminal-Bench HardGemini 3 Flash Preview by 14.438.624.2+14.4
- SciCodeGemini 3 Flash Preview by 6.450.644.2+6.4
ReasoningGemini 3 Flash Preview
- Humanity's Last ExamGemini 3 Flash Preview by 17.336.619.3+17.3
- CritPtGemini 3 Flash Preview by 5.78.62.9+5.7
- SimpleBenchGemini 3 Flash Preview by 5.161.156+5.1
- GPQA DiamondGemini 3 Flash Preview by 4.589.885.3+4.5
FactsGemini 3 Flash Preview
- AA-Omniscience · AccuracyGemini 3 Flash Preview by 28.353.425.1+28.3
- AA-Omniscience · Non-hallucinationGrok 4.1 Fast by 19.6726.6+19.6
- Vectara HHEM hallucination ratelower is betterGemini 3 Flash Preview by 5.713.519.2+5.7
Images and chartsGemini 3 Flash Preview
- MMMU-ProGemini 3 Flash Preview by 16.679.963.3+16.6
- LMArena · VisionGemini 3 Flash Preview by 84 rating points12851201+84 rating
MathGemini 3 Flash Preview
- HMMT Feb. 2026Gemini 3 Flash Preview by 389.486.4+3
- AIME 2026Gemini 3 Flash Preview by 2.596.794.2+2.5
Long documentsGemini 3 Flash Preview
- AA-LCRGemini 3 Flash Preview by 47874+4
Following instructionsGemini 3 Flash Preview
- IFBenchGemini 3 Flash Preview by 25.37852.7+25.3
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.
- AA-OmniscienceGemini 3 Flash Preview by 4010.1-29.9+40
- Artificial Analysis Coding IndexGemini 3 Flash Preview by 23.142.619.5+23.1
- AA Agentic IndexGemini 3 Flash Preview by 16.849.732.9+16.8
- matharena_visual_math_overallGemini 3 Flash Preview by 16.885.869+16.8
- τ²-Bench Telecom (AA run)Grok 4.1 Fast by 12.980.493.3+12.9
- vectara_avg_summary_lengthGrok 4.1 Fast by 9.390.299.5+9.3
- AA IntelligenceGemini 3 Flash Preview by 5.926.320.4+5.9
- vectara_factual_consistencyGemini 3 Flash Preview by 5.786.580.8+5.7
- vectara_answer_ratetie99.899.7tie
- HMMT Nov. 2025tie93.393.3tie
Questions people ask
Which is better, Gemini 3 Flash Preview or Grok 4.1 Fast?
Gemini 3 Flash Preview wins all eight areas we test: coding, agents, reasoning, facts, images and charts, math, long documents and following instructions. Grok 4.1 Fast wins none, but costs 80% less.
Which is better for coding?
Gemini 3 Flash Preview. It wins 3 of the 3 coding tests both models report; Grok 4.1 Fast wins none.
Which is cheaper?
Gemini 3 Flash Preview costs $0.50 per million input tokens and $3.00 per million output tokens; Grok 4.1 Fast costs $0.20 and $0.50. That makes Grok 4.1 Fast about 80% cheaper for the same work.
How do you compare the two?
We use the 27 benchmark tests both models have published scores on. The verdict counts the 17 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.