Gemini 3.5 Flash vs Grok4.5
Wins 3 of 8 areas
Images and charts · Math · Following instructions
Wins 3 of 8 areas
Coding · Agents · Long documents
The two are evenly matched.Gemini 3.5 Flash is better at images and charts and math; Grok4.5 at coding and agents.
Scores updated · 38 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 software15Grok4.55 of 6 tests
- AgentsCarrying out multi-step tasks on its own03Grok4.53 of 3 tests
- Long documentsFinding answers in very long texts02Grok4.52 of 2 tests
- Images and chartsUnderstanding pictures, charts and video30Gemini 3.5 Flash3 of 3 tests
- MathCompetition and research-level math21Gemini 3.5 Flash2 of 3 tests
- Following instructionsDoing exactly what it is asked10Gemini 3.5 Flash1 of 1 test
- ReasoningHard problems that need careful thinking22Even2 each · 2 ties
- FactsGetting facts right instead of making them up11Even1 each · 1 tie
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 24% less for the same work.
The biggest differences
The three tests each model wins by the widest margin. Scores are out of 100.
Where Grok4.5 pulls ahead
- Finds one of eight look-alike replies in a long chatMRCR v2 8 needle 128k (average)+54.8points ahead
- Customer-service tasks in a simulated bankτ-Bench V3 · Banking+9.9points ahead
- Long, multi-file coding tasks in real codebasesSWE-bench Pro+9.6points ahead
Where Gemini 3.5 Flash pulls ahead
- Abstract visual puzzles that people can solveARC-AGI-2+19.5points ahead
- Short factual questions, answered correctlySimpleQA Verified+17.9points ahead
- Programming problems, refreshed regularlyLiveBench · Coding+9.6points ahead
Every test, side by side
All 38 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGrok4.5
- LiveBench · CodingGemini 3.5 Flash by 9.678.268.6+9.6
- SWE-bench ProGrok4.5 by 9.655.164.7+9.6
- LiveBench · Agentic CodingGrok4.5 by 7.54956.5+7.5
- LMArena · WebDevGrok4.5 by 53 rating points14991552+53 rating
- Terminal-Bench 2.1Grok4.5 by 2.978.781.6+2.9
- SciCodeGrok4.5 by 1.153.955+1.1
AgentsGrok4.5
- τ-Bench V3 · BankingGrok4.5 by 9.932.242.1+9.9
- GDPValGrok4.5 by 9.335.244.5+9.3
- Terminal-Bench 4.0Grok4.5 by 46.610.6+4
ReasoningEven
- ARC-AGI-2Gemini 3.5 Flash by 19.572.152.6+19.5
- SimpleBenchGemini 3.5 Flash by 6.776.770+6.7
- LiveBench · ReasoningGrok4.5 by 5.28287.2+5.2
- CritPtGrok4.5 by 2.313.115.4+2.3
- GPQA Diamondtie92.293.1tie
- Humanity's Last Examtie42.742.7tie
FactsEven
- SimpleQA VerifiedGemini 3.5 Flash by 17.966.248.3+17.9
- AA-Omniscience · Non-hallucinationGrok4.5 by 8.137.845.9+8.1
- AA-Omniscience · Accuracytie51.451.5tie
Images and chartsGemini 3.5 Flash
- MMMU-ProGemini 3.5 Flash by 3.984.380.4+3.9
- CharXiv (RQ)Gemini 3.5 Flash by 2.684.281.6+2.6
- LMArena · VisionGemini 3.5 Flash by 22 rating points13101288+22 rating
MathGemini 3.5 Flash
- FrontierMath Tiers 1-3 (v2)Gemini 3.5 Flash by 5.662.857.2+5.6
- LiveBench · MathematicsGrok4.5 by 2.688.290.8+2.6
- FrontierMath Tier 4Gemini 3.5 Flash by 2.426.824.4+2.4
Long documentsGrok4.5
- MRCR v2 8 needle 128k (average)Grok4.5 by 54.826.681.4+54.8
- AA-LCRGrok4.5 by 673.379.3+6
Following instructionsGemini 3.5 Flash
- LiveBench · Instruction FollowingGemini 3.5 Flash by 4.175.671.5+4.1
Other results11 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 186 rating points13491535+186 rating
- DeepSWE 1.1Grok4.5 by 173754+17
- DeepSWEGrok4.5 by 163753+16
- AA Agentic IndexGrok4.5 by 14.827.342.1+14.8
- livebench_data_analysisGrok4.5 by 8.164.973+8.1
- ARC-AGI-1Gemini 3.5 Flash by 6.892.585.7+6.8
- MLE-BenchGemini 3.5 Flash by 6.549.743.2+6.5
- AA IntelligenceGrok4.5 by 6.232.638.8+6.2
- AA-OmniscienceGrok4.5 by 4.121.225.3+4.1
- Artificial Analysis Coding IndexGrok4.5 by 2.370.172.4+2.3
- livebench_languageGemini 3.5 Flash by 1.884.682.8+1.8
Questions people ask
Which is better, Gemini 3.5 Flash or Grok4.5?
Gemini 3.5 Flash and Grok4.5 each win three of the eight areas we test. Gemini 3.5 Flash wins images and charts, math and following instructions; Grok4.5 wins coding, agents and long documents. Grok4.5 costs 24% less. They are level on reasoning and facts.
Which is better for coding?
Grok4.5. It wins 5 of the 6 coding tests both models report; Gemini 3.5 Flash wins 1.
Which is cheaper?
Gemini 3.5 Flash costs $1.50 per million input tokens and $9.00 per million output tokens; Grok4.5 costs $2.00 and $6.00. That makes Grok4.5 about 24% cheaper for the same work.
How do you compare the two?
We use the 38 benchmark tests both models have published scores on. The verdict counts the 27 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 11 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.