Gemini 2.5 Flash vs Grok 3
Wins 5 of 7 areas
Agents · Reasoning · Images and charts · Long documents · Following instructions
Wins 1 of 7 areas
Facts
Gemini 2.5 Flash is the stronger all-rounder.Grok 3 is better at facts.
Scores updated · 27 tests both models report · How we compare
Where each one wins
Tests won in each of the seven areas where both have results. 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 thinking50Gemini 2.5 Flash5 of 5 tests
- AgentsCarrying out multi-step tasks on its own10Gemini 2.5 Flash1 of 1 test
- Images and chartsUnderstanding pictures, charts and video10Gemini 2.5 Flash1 of 1 test
- Long documentsFinding answers in very long texts10Gemini 2.5 Flash1 of 1 test
- Following instructionsDoing exactly what it is asked10Gemini 2.5 Flash1 of 1 test
- FactsGetting facts right instead of making them up12Grok 32 of 3 tests
- CodingWriting and fixing software11Even1 each
Agents, images and charts, 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 2.5 Flash costs 88% 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 2.5 Flash pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+12points ahead
- Graduate-level biology, physics and chemistry questionsGPQA Diamond+9.7points ahead
- Very hard expert questions across many subjectsHumanity's Last Exam+8points ahead
Where Grok 3 pulls ahead
- Code for real scientific research problemsSciCode+7.7points ahead
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+2.9points 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.
CodingEven
- SciCodeGrok 3 by 7.729.136.8+7.7
- Terminal-Bench HardGemini 2.5 Flash by 2.213.611.4+2.2
ReasoningGemini 2.5 Flash
- GPQA DiamondGemini 2.5 Flash by 9.77969.3+9.7
- Humanity's Last ExamGemini 2.5 Flash by 812.14.1+8
- SimpleBenchGemini 2.5 Flash by 5.141.236.1+5.1
- ARC-AGI-2Gemini 2.5 Flash by 2.52.50+2.5
- CritPtGemini 2.5 Flash by 1.11.10+1.1
FactsGrok 3
- AA-Omniscience · Non-hallucinationGemini 2.5 Flash by 1224.712.7+12
- AA-Omniscience · AccuracyGrok 3 by 2.925.928.9+2.9
- Vectara HHEM hallucination ratelower is betterGrok 3 by 27.85.8+2
Images and chartsGemini 2.5 Flash
- MMMUGemini 2.5 Flash by 1.779.778+1.7
Following instructionsGemini 2.5 Flash
- IFBenchGemini 2.5 Flash by 3.450.346.9+3.4
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.
- SimpleQAGrok 3 by 55.126.982+55.1
- ARC-AGI-1Gemini 2.5 Flash by 26.832.35.5+26.8
- AIME 2025Grok 3 by 21.37293.3+21.3
- τ²-Bench Telecom (AA run)Grok 3 by 17.231.648.8+17.2
- vectara_answer_rateGemini 2.5 Flash by 69993+6
- AA Agentic IndexGrok 3 by 5.818.824.6+5.8
- frontiermath_tier_4_v1Gemini 2.5 Flash by 4.24.20+4.2
- AA-OmniscienceGemini 2.5 Flash by 3.4-29.8-33.2+3.4
- LiveCodeBenchGrok 3 by 3.276.279.4+3.2
- Artificial Analysis Coding IndexGemini 2.5 Flash by 2.422.219.8+2.4
- vectara_factual_consistencyGrok 3 by 292.294.2+2
- AA IntelligenceGemini 2.5 Flash by 113.112.1+1
- vectara_avg_summary_lengthtie101.595.9tie
Questions people ask
Which is better, Gemini 2.5 Flash or Grok 3?
Gemini 2.5 Flash wins five of the seven areas where both have results: agents, reasoning, images and charts, long documents and following instructions. Grok 3 wins facts. They are level on coding.
Which is better for coding?
Neither. They win 1 coding test each of the 2 both models report.
Which is cheaper?
Gemini 2.5 Flash costs $0.30 per million input tokens and $2.50 per million output tokens; Grok 3 costs $4.00 and $20.00. That makes Gemini 2.5 Flash about 88% 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 14 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.