DeepSeek-V4.1-Flash vs Gemini 3.5 Flash
Wins 4 of 8 areas
Coding · Agents · Math · Long documents
Wins 3 of 8 areas
Facts · Images and charts · Following instructions
DeepSeek-V4.1-Flash wins more areas, narrowly.Gemini 3.5 Flash is better at facts.
Scores updated · 31 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 software41DeepSeek-V4.1-Flash4 of 5 tests
- AgentsCarrying out multi-step tasks on its own30DeepSeek-V4.1-Flash3 of 3 tests
- MathCompetition and research-level math30DeepSeek-V4.1-Flash3 of 3 tests
- Long documentsFinding answers in very long texts10DeepSeek-V4.1-Flash1 of 1 test
- FactsGetting facts right instead of making them up03Gemini 3.5 Flash3 of 3 tests
- Images and chartsUnderstanding pictures, charts and video03Gemini 3.5 Flash3 of 3 tests
- Following instructionsDoing exactly what it is asked01Gemini 3.5 Flash1 of 1 test
- ReasoningHard problems that need careful thinking33Even3 each
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.
DeepSeek-V4.1-Flash costs 86% less for the same work.
The biggest differences
The three tests each model wins by the widest margin. Scores are out of 100.
Where DeepSeek-V4.1-Flash pulls ahead
- Fixes real GitHub issues, working as an agentLiveBench · Agentic Coding+28.3points ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+20.2points ahead
- Real work tasks from 44 professionsGDPVal+19.9points ahead
Where Gemini 3.5 Flash pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+34.3points ahead
- Short factual questions, answered correctlySimpleQA Verified+23.3points ahead
- Reasoning about charts from research papersCharXiv (RQ)+15.2points ahead
Every test, side by side
All 31 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingDeepSeek-V4.1-Flash
- LiveBench · Agentic CodingDeepSeek-V4.1-Flash by 28.377.349+28.3
- LMArena · WebDevDeepSeek-V4.1-Flash by 120 rating points16191499+120 rating
- Terminal-Bench 2.1DeepSeek-V4.1-Flash by 11.990.678.7+11.9
- SciCodeGemini 3.5 Flash by 251.953.9+2
- LiveBench · CodingDeepSeek-V4.1-Flash by 1.88078.2+1.8
AgentsDeepSeek-V4.1-Flash
- Terminal-Bench 4.0DeepSeek-V4.1-Flash by 20.226.86.6+20.2
- GDPValDeepSeek-V4.1-Flash by 19.95535.1+19.9
- AA IT-Bench SREDeepSeek-V4.1-Flash by 6.646.940.3+6.6
ReasoningEven
- SimpleBenchGemini 3.5 Flash by 1066.776.7+10
- ARC-AGI-2DeepSeek-V4.1-Flash by 678.172.1+6
- LiveBench · ReasoningDeepSeek-V4.1-Flash by 4.786.782+4.7
- Humanity's Last ExamGemini 3.5 Flash by 3.539.242.7+3.5
- GPQA DiamondGemini 3.5 Flash by 1.390.992.2+1.3
- CritPtDeepSeek-V4.1-Flash by 1.214.313.1+1.2
FactsGemini 3.5 Flash
- AA-Omniscience · Non-hallucinationGemini 3.5 Flash by 34.33.537.8+34.3
- SimpleQA VerifiedGemini 3.5 Flash by 23.342.966.2+23.3
- AA-Omniscience · AccuracyGemini 3.5 Flash by 546.451.4+5
Images and chartsGemini 3.5 Flash
- CharXiv (RQ)Gemini 3.5 Flash by 15.26984.2+15.2
- MMMU-ProGemini 3.5 Flash by 7.37784.3+7.3
- LMArena · VisionGemini 3.5 Flash by 30 rating points12781308+30 rating
MathDeepSeek-V4.1-Flash
- FrontierMath Tier 4DeepSeek-V4.1-Flash by 19.546.326.8+19.5
- FrontierMath Tiers 1-3 (v2)DeepSeek-V4.1-Flash by 8.471.262.8+8.4
- LiveBench · MathematicsDeepSeek-V4.1-Flash by 5.193.388.2+5.1
Long documentsDeepSeek-V4.1-Flash
- AA-LCRDeepSeek-V4.1-Flash by 10.78473.3+10.7
Following instructionsGemini 3.5 Flash
- LiveBench · Instruction FollowingGemini 3.5 Flash by 5.67075.6+5.6
Other results6 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.
- DeepSWE 1.1DeepSeek-V4.1-Flash by 37.274.237+37.2
- AA-OmniscienceGemini 3.5 Flash by 26.5-5.321.2+26.5
- livebench_data_analysisDeepSeek-V4.1-Flash by 14.479.364.9+14.4
- AA IntelligenceDeepSeek-V4.1-Flash by 6.939.532.6+6.9
- livebench_languageGemini 3.5 Flash by 3.481.284.6+3.4
- ARC-AGI-1DeepSeek-V4.1-Flash by 193.592.5+1
Questions people ask
Which is better, DeepSeek-V4.1-Flash or Gemini 3.5 Flash?
DeepSeek-V4.1-Flash wins four of the eight areas we test: coding, agents, math and long documents. Gemini 3.5 Flash wins facts, images and charts and following instructions. They are level on reasoning.
Which is better for coding?
DeepSeek-V4.1-Flash. It wins 4 of the 5 coding tests both models report; Gemini 3.5 Flash wins 1.
Which is cheaper?
DeepSeek-V4.1-Flash costs $0.30 per million input tokens and $1.20 per million output tokens; Gemini 3.5 Flash costs $1.50 and $9.00. That makes DeepSeek-V4.1-Flash about 86% cheaper for the same work.
How do you compare the two?
We use the 31 benchmark tests both models have published scores on. The verdict counts the 25 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 6 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.