DeepSeek V4.1 Flash vs Gemini 3.1 Flash Lite Preview

DeepSeek V4.1 Flash leads Gemini 3.1 Flash Lite Preview on coding, 62.5 to 22.7 on the Vibe Coding Index, and DeepSeek V4.1 Flash costs 1.8x less per output token ($0.84 vs $1.50 per million). Updated October 22, 2026; 62 benchmarks have a result for both.

Replace DeepSeek V4.1 Flash Replace Gemini 3.1 Flash Lite Preview

DeepSeek V4.1 FlashDeepSeek

Coding: 62.5
Overall: 62.4
Output $/M: $0.84

Gemini 3.1 Flash Lite PreviewGoogle

Coding: 22.7
Overall: 36.6
Output $/M: $1.50

vs boards won of 62 shared

DeepSeek V4.1 Flash or Gemini 3.1 Flash Lite Preview: which to pick

Pick DeepSeek V4.1 Flash for coding: it scores 62.5 on the Vibe Coding Index against 22.7 for Gemini 3.1 Flash Lite Preview.

Pick Gemini 3.1 Flash Lite Preview for work measured by LegalBench (Vals AI) or MedCode (Vals AI), where it leads.

Model ADeepSeek V4.1 FlashDeepSeek62.5/1005 independent benchmarksNo cost per solved task Model BGemini 3.1 Flash Lite PreviewGoogle22.7/1003 independent benchmarks$0.18 per solved task

623917

Shared results: 62
DeepSeek V4.1 Flash only: 39
Gemini 3.1 Flash Lite Preview only: 17
Like-for-like categories: 8 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

Coding
Vibe Coding Index, six public coding benchmarks
DeepSeek V4.1 Flash
DeepSeek V4.1 Flash scores 62.5 against 22.7.
5 and 3 benchmarks behind the scores
Intelligence
AA Intelligence Index
DeepSeek V4.1 Flash
DeepSeek V4.1 Flash leads, 24.7 against 15.6.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Gemini 3.1 Flash Lite Preview has a AA Agentic Index result, 1.6.
Directional only
Reasoning
GPQA Diamond
No call
Only Gemini 3.1 Flash Lite Preview has a GPQA Diamond result, 81.1%.
Directional only
Math
AIME
No call
Only Gemini 3.1 Flash Lite Preview has a AIME result, 83.3%.
Directional only
Knowledge
MMLU Pro
No call
Only Gemini 3.1 Flash Lite Preview has a MMLU Pro result, 86.2%.
Directional only
Web design
Design Arena: websites
DeepSeek V4.1 Flash
DeepSeek V4.1 Flash leads, 1308 against 1082.
Same board, both measured
Long documents
Listed context window
No call
Both take 1.05M tokens.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
DeepSeek V4.1 Flash
DeepSeek V4.1 Flash $0.0006, Gemini 3.1 Flash Lite Preview $0.0010 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Gemini 3.1 Flash Lite Preview has the number, $0.18.
Directional only

At a glance

Coding index: DeepSeek V4.1 Flash 62.5 from 5 benchmarks, Gemini 3.1 Flash Lite Preview 22.7 from 3 benchmarks.
Widest category: Coding, 37.8 points apart on average over 11 shared benchmarks.
Widest single gap: Vibe Code Bench (Vals AI): DeepSeek V4.1 Flash 84.7% against Gemini 3.1 Flash Lite Preview 0.0%, 84.7 points apart on a 0 to 100 scale.
Output price: DeepSeek V4.1 Flash $0.84 against Gemini 3.1 Flash Lite Preview $1.50 per million output tokens, 1.8x apart.
Context window: Both take 1.05M tokens.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
Category	DeepSeek V4.1 Flash	Gemini 3.1 Flash Lite Preview
Coding	11	0
Intelligence	1	0
Agentic work	4	0
Reasoning	5	0
Math	2	0
Knowledge	4	2
Web design	8	0
General	23	2
All shared boards	58	4

CodingLike-for-likeSix of these boards feed the Vibe Coding Index110

Coding benchmarks for DeepSeek V4.1 Flash and Gemini 3.1 Flash Lite Preview
Benchmark	DeepSeek V4.1 Flash	Gemini 3.1 Flash Lite Preview	Leader
LiveBench coding	90.2%	Not measured	Only DeepSeek V4.1 Flash measured
LMArena WebDev	1618	1257	DeepSeek V4.1 Flash
AA Coding Index	Not measured	34.7	Only Gemini 3.1 Flash Lite Preview measured
LiveCodeBench (Vals AI)	Not measured	80.1%	Only Gemini 3.1 Flash Lite Preview measured
SWE-bench Verified (Vals AI)	Not measured	62.8%	Only Gemini 3.1 Flash Lite Preview measured
Terminal-Bench 4 (Vals AI)	19.7%	Not measured	Only DeepSeek V4.1 Flash measured
Vibe Code Bench (Vals AI)	84.7%	0.0%	DeepSeek V4.1 Flash
Code migration (Vals AI)	45.6%	4.6%	DeepSeek V4.1 Flash
ProgramBench (Vals AI)	0.5%	0.0%	DeepSeek V4.1 Flash
IOI (Vals AI)	40.3%	Not measured	Only DeepSeek V4.1 Flash measured
Terminal-Bench 2.1 (Vals AI)	74.5%	34.1%	DeepSeek V4.1 Flash
SWE-bench Multimodal (Vals AI)	46.5%	Not measured	Only DeepSeek V4.1 Flash measured
Vibe Code Bench 1-100 (Vals AI)	16.4%	Not measured	Only DeepSeek V4.1 Flash measured
SkillsBench (Vals AI)	69.8%	Not measured	Only DeepSeek V4.1 Flash measured
CyberBench (Vals AI)	73.7%	Not measured	Only DeepSeek V4.1 Flash measured
SciCode	51.9%	Not measured	Only DeepSeek V4.1 Flash measured
FrontierCode	43.9%	Not measured	Only DeepSeek V4.1 Flash measured
ALE-Bench	1092.3	797.7	DeepSeek V4.1 Flash
LMArena Text: coding	1502	1400	DeepSeek V4.1 Flash
LMArena Text: software and IT	1496	1413	DeepSeek V4.1 Flash
LMArena WebDev: React	1628	1245	DeepSeek V4.1 Flash
LMArena WebDev: HTML	1612	1276	DeepSeek V4.1 Flash
LMArena WebDev: from an image	1606	1336	DeepSeek V4.1 Flash
SciCode	Not measured	4.6%	Only Gemini 3.1 Flash Lite Preview measured
Neither model has a result on the other 15 boards here

IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10

Intelligence benchmarks for DeepSeek V4.1 Flash and Gemini 3.1 Flash Lite Preview
Benchmark	DeepSeek V4.1 Flash	Gemini 3.1 Flash Lite Preview	Leader
AA Intelligence Index	24.7	15.6	DeepSeek V4.1 Flash
Epoch Capabilities Index	155.9	Not measured	Only DeepSeek V4.1 Flash measured

Agentic workLike-for-likePublic boards, shown as published, kept out of the index40

Agentic work benchmarks for DeepSeek V4.1 Flash and Gemini 3.1 Flash Lite Preview
Benchmark	DeepSeek V4.1 Flash	Gemini 3.1 Flash Lite Preview	Leader
AA Agentic Index	Not measured	1.6	Only Gemini 3.1 Flash Lite Preview measured
LiveBench research	86.8%	Not measured	Only DeepSeek V4.1 Flash measured
LiveBench browser	84.0%	Not measured	Only DeepSeek V4.1 Flash measured
LiveBench long agentic	40.1%	Not measured	Only DeepSeek V4.1 Flash measured
SREBench (Vals AI)	0.8%	Not measured	Only DeepSeek V4.1 Flash measured
Finance Agent (Vals AI)	53.5%	30.0%	DeepSeek V4.1 Flash
Tax Agent Bench (Vals AI)	26.6%	3.1%	DeepSeek V4.1 Flash
Legal Research Bench (Vals AI)	41.4%	3.4%	DeepSeek V4.1 Flash
Excel Modeling Benchmark (Vals AI)	57.2%	8.6%	DeepSeek V4.1 Flash
BioMysteryBench (Vals AI)	67.8%	Not measured	Only DeepSeek V4.1 Flash measured
Terminal-Bench-Science (Vals AI)	0.0%	Not measured	Only DeepSeek V4.1 Flash measured
Vals Science Index	29.6%	Not measured	Only DeepSeek V4.1 Flash measured
APEX-Agents	39.5%	Not measured	Only DeepSeek V4.1 Flash measured
Neither model has a result on the other 28 boards here

ReasoningLike-for-likePublic boards, shown as published, kept out of the index50

Reasoning benchmarks for DeepSeek V4.1 Flash and Gemini 3.1 Flash Lite Preview
Benchmark	DeepSeek V4.1 Flash	Gemini 3.1 Flash Lite Preview	Leader
GPQA Diamond	Not measured	81.1%	Only Gemini 3.1 Flash Lite Preview measured
LiveBench reasoning	86.7%	Not measured	Only DeepSeek V4.1 Flash measured
MysteryMechanism (Vals AI)	21.2%	Not measured	Only DeepSeek V4.1 Flash measured
MMMU Pro (Vals AI)	Not measured	82.5%	Only Gemini 3.1 Flash Lite Preview measured
Humanity's Last Exam (Artificial Analysis run)	39.2%	Not measured	Only DeepSeek V4.1 Flash measured
GPQA Diamond (Epoch AI run)	89.8%	Not measured	Only DeepSeek V4.1 Flash measured
ARC-AGI	94.5%	Not measured	Only DeepSeek V4.1 Flash measured
ARC-AGI-2	72.9%	Not measured	Only DeepSeek V4.1 Flash measured
Chess puzzles	48.0%	Not measured	Only DeepSeek V4.1 Flash measured
Mystery game puzzles	43.0%	Not measured	Only DeepSeek V4.1 Flash measured
LMArena Text: hard prompts	1483	1407	DeepSeek V4.1 Flash
LMArena Text: expert	1501	1398	DeepSeek V4.1 Flash
LMArena Text: hard prompts in English	1488	1403	DeepSeek V4.1 Flash
LMArena Vision: diagrams	1297	1242	DeepSeek V4.1 Flash
LMArena Vision: homework	1307	1271	DeepSeek V4.1 Flash
Neither model has a result on the other 7 boards here

MathLike-for-likePublic boards, shown as published, kept out of the index20

Math benchmarks for DeepSeek V4.1 Flash and Gemini 3.1 Flash Lite Preview
Benchmark	DeepSeek V4.1 Flash	Gemini 3.1 Flash Lite Preview	Leader
AIME	Not measured	83.3%	Only Gemini 3.1 Flash Lite Preview measured
OTIS Mock AIME	98.3%	Not measured	Only DeepSeek V4.1 Flash measured
FrontierMath, tiers 1 to 3	67.4%	Not measured	Only DeepSeek V4.1 Flash measured
FrontierMath, tier 4	26.8%	Not measured	Only DeepSeek V4.1 Flash measured
ProofBench	54.0%	Not measured	Only DeepSeek V4.1 Flash measured
LMArena Text: math	1478	1428	DeepSeek V4.1 Flash
LMArena Text: mathematical work	1485	1417	DeepSeek V4.1 Flash
Neither model has a result on the other 6 boards here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index42

Knowledge benchmarks for DeepSeek V4.1 Flash and Gemini 3.1 Flash Lite Preview
Benchmark	DeepSeek V4.1 Flash	Gemini 3.1 Flash Lite Preview	Leader
MMLU Pro	Not measured	86.2%	Only Gemini 3.1 Flash Lite Preview measured
LegalBench (Vals AI)	83.3%	83.8%	Gemini 3.1 Flash Lite Preview
CaseLaw (Vals AI)	Not measured	55.0%	Only Gemini 3.1 Flash Lite Preview measured
CorpFin (Vals AI)	Not measured	59.4%	Only Gemini 3.1 Flash Lite Preview measured
TaxEval (Vals AI)	Not measured	71.8%	Only Gemini 3.1 Flash Lite Preview measured
MortgageTax (Vals AI)	Not measured	68.0%	Only Gemini 3.1 Flash Lite Preview measured
MedCode (Vals AI)	41.2%	47.6%	Gemini 3.1 Flash Lite Preview
SimpleQA Verified	42.9%	Not measured	Only DeepSeek V4.1 Flash measured
LMArena Text: science	1469	1425	DeepSeek V4.1 Flash
LMArena Text: medicine and healthcare	1484	1428	DeepSeek V4.1 Flash
LMArena Text: legal and government	1443	1418	DeepSeek V4.1 Flash
LMArena Text: business and finance	1461	1389	DeepSeek V4.1 Flash
FACTS Benchmark Suite	Not measured	51.4%	Only Gemini 3.1 Flash Lite Preview measured
Neither model has a result on the other 5 boards here

Web designLike-for-likePublic boards, shown as published, kept out of the index80

Web design benchmarks for DeepSeek V4.1 Flash and Gemini 3.1 Flash Lite Preview
Benchmark	DeepSeek V4.1 Flash	Gemini 3.1 Flash Lite Preview	Leader
Design Arena: websites	1308	1082	DeepSeek V4.1 Flash
Design Arena: UI components	1312	1069	DeepSeek V4.1 Flash
Design Arena: game dev	1330	1029	DeepSeek V4.1 Flash
Design Arena: data viz	1291	1045	DeepSeek V4.1 Flash
Design Arena: 3D	1355	1047	DeepSeek V4.1 Flash
Design Arena: all code categories	1320	1072	DeepSeek V4.1 Flash
Design Arena: SVG	1245	1052	DeepSeek V4.1 Flash
Design Arena: ASCII art	1265	1167	DeepSeek V4.1 Flash
LiveBench design	79.2%	Not measured	Only DeepSeek V4.1 Flash measured

GeneralLike-for-likePublic boards, shown as published, kept out of the index232

General benchmarks for DeepSeek V4.1 Flash and Gemini 3.1 Flash Lite Preview
Benchmark	DeepSeek V4.1 Flash	Gemini 3.1 Flash Lite Preview	Leader
LiveBench data analysis	79.3%	Not measured	Only DeepSeek V4.1 Flash measured
Public Benefits Bench (Vals AI)	64.3%	Not measured	Only DeepSeek V4.1 Flash measured
SAGE (Vals AI)	47.9%	49.5%	Gemini 3.1 Flash Lite Preview
MedScribe (Vals AI)	85.5%	63.9%	DeepSeek V4.1 Flash
Vals Multimodal Index	Not measured	41.4%	Only Gemini 3.1 Flash Lite Preview measured
Long context reasoning (AA-LCR)	84.0%	Not measured	Only DeepSeek V4.1 Flash measured
DTBench	89.9%	Not measured	Only DeepSeek V4.1 Flash measured
LMCA	47.0%	Not measured	Only DeepSeek V4.1 Flash measured
Surface Evolver Bench	46.3%	Not measured	Only DeepSeek V4.1 Flash measured
Furniture assembly	34.2%	Not measured	Only DeepSeek V4.1 Flash measured
LMArena Text	1464	1416	DeepSeek V4.1 Flash
LMArena Text: instruction following	1473	1377	DeepSeek V4.1 Flash
LMArena Text: creative writing	1437	1401	DeepSeek V4.1 Flash
LMArena Vision	1278	1240	DeepSeek V4.1 Flash
LMArena Text: English	1473	1414	DeepSeek V4.1 Flash
LMArena Text: non-English	1449	1410	DeepSeek V4.1 Flash
LMArena Text: Chinese	1501	1460	DeepSeek V4.1 Flash
LMArena Text: German	1470	1430	DeepSeek V4.1 Flash
LMArena Text: Japanese	1432	1413	DeepSeek V4.1 Flash
LMArena Text: Korean	1436	1392	DeepSeek V4.1 Flash
LMArena Text: French	1465	1424	DeepSeek V4.1 Flash
LMArena Text: Spanish	1459	1421	DeepSeek V4.1 Flash
LMArena Text: Russian	1467	1420	DeepSeek V4.1 Flash
LMArena Text: Polish	1457	1443	DeepSeek V4.1 Flash
LMArena Text: multi-turn	1461	1417	DeepSeek V4.1 Flash
LMArena Text: longer queries	1473	1394	DeepSeek V4.1 Flash
LMArena Text: writing and language	1450	1408	DeepSeek V4.1 Flash
LMArena Text: entertainment and media	1445	1386	DeepSeek V4.1 Flash
LMArena Vision: English	1288	1232	DeepSeek V4.1 Flash
LMArena Vision: Chinese	1327	1278	DeepSeek V4.1 Flash
LMArena Vision: reading text	1282	1246	DeepSeek V4.1 Flash
LMArena Vision: humor	1260	1266	Gemini 3.1 Flash Lite Preview
LMArena Vision: captioning	Not measured	1259	Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: recognizing things	Not measured	1308	Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: creative writing	1275	1248	DeepSeek V4.1 Flash
Neither model has a result on the other 11 boards here

Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared

Image generation benchmarks for DeepSeek V4.1 Flash and Gemini 3.1 Flash Lite Preview
Benchmark	DeepSeek V4.1 Flash	Gemini 3.1 Flash Lite Preview	Leader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

DeepSeek V4.1 Flash$0.0006Fits in one request

Gemini 3.1 Flash Lite Preview$0.0010Fits in one request

DeepSeek V4.1 Flash costs less

Repository review

50K input + 3K output tokens

DeepSeek V4.1 Flash$0.014Fits in one request

Gemini 3.1 Flash Lite Preview$0.017Fits in one request

DeepSeek V4.1 Flash costs less

Agent loop

200K input + 10K output tokens

DeepSeek V4.1 Flash$0.053Fits in one request

Gemini 3.1 Flash Lite Preview$0.065Fits in one request

DeepSeek V4.1 Flash costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of DeepSeek V4.1 Flash and Gemini 3.1 Flash Lite Preview
Specification	DeepSeek V4.1 Flash	Google Gemini 3.1 Flash Lite Preview
Maker	DeepSeek	Google
Weights	Open weights	No public weights listed
Released	September 10, 2026	March 3, 2026
Context window	1.05M	1.05M
Input $/Mtok	$0.2225	$0.25
Output $/Mtok	$0.84	$1.50
Coding index	62.5	22.7
Independent measurements behind it	5	3
Cost per solved task	Not computable	$0.18
Source	OpenRouter listing	OpenRouter listing

Questions

Is DeepSeek V4.1 Flash better than Gemini 3.1 Flash Lite Preview for coding?

Pick DeepSeek V4.1 Flash for coding: it scores 62.5 on the Vibe Coding Index against 22.7 for Gemini 3.1 Flash Lite Preview. Pick Gemini 3.1 Flash Lite Preview for work measured by LegalBench (Vals AI) or MedCode (Vals AI), where it leads.

Which is cheaper, DeepSeek V4.1 Flash or Gemini 3.1 Flash Lite Preview?

DeepSeek V4.1 Flash costs $0.2225 per million input tokens and $0.84 per million output tokens; Gemini 3.1 Flash Lite Preview costs $0.25 and $1.50. Cost per solved task is known for Gemini 3.1 Flash Lite Preview only.

Which has the bigger context window, DeepSeek V4.1 Flash or Gemini 3.1 Flash Lite Preview?

Neither: both take 1.05M tokens.

How many benchmarks is the DeepSeek V4.1 Flash vs Gemini 3.1 Flash Lite Preview comparison based on?

62 benchmarks have a result for both models as of October 22, 2026. DeepSeek V4.1 Flash's coding index rests on 5 independent benchmarks and Gemini 3.1 Flash Lite Preview's on 3. Where only one model has a result, the page says so instead of naming a winner.

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<iframe src="https://llmbenchmark.ai/embed/compare/deepseek-v4-1-flash-vs-gemini-3-1-flash-lite-preview" title="DeepSeek V4.1 Flash vs Gemini 3.1 Flash Lite Preview, LLMBenchmark.ai" width="100%" height="360" style="border:0;max-width:100%" loading="lazy"></iframe>
<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/deepseek-v4-1-flash-vs-gemini-3-1-flash-lite-preview">LLMBenchmark.ai, DeepSeek V4.1 Flash vs Gemini 3.1 Flash Lite Preview</a></p>

DeepSeek V4.1 Flash or Gemini 3.1 Flash Lite Preview: which to pick

Which one for your work

Coding

Intelligence

Agentic work

Reasoning

Math

Knowledge

Web design

Long documents

Everyday cost

Cost per solved task

At a glance

Benchmark by benchmark

What each workload costs

Chat turn

Repository review

Agent loop

Specification differences

Questions

Compare next