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Gemini 3.1 Flash Lite Preview vs Gemini 3.5 Flash Lite

Updated October 21, 2026. 63 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Gemini 3.1 Flash Lite Preview Replace Gemini 3.5 Flash Lite
Gemini 3.1 Flash Lite PreviewGoogle
Coding
8.1
Overall
15.6
Output $/M
$1.50
6
Gemini 3.5 Flash LiteGoogle
Coding
33.6
Overall
22.2
Output $/M
$2.50
56
vs boards won of 63 shared, 1 tied

Decision reading

Pick Gemini 3.5 Flash Lite for coding: it scores 33.6 on the Vibe Coding Index against 8.1 for Gemini 3.1 Flash Lite Preview.

Pick Gemini 3.1 Flash Lite Preview when output tokens cost 1.7x less, or when a solved task costs $0.18 against $0.41.

Model AGemini 3.1 Flash Lite PreviewGoogle8.1/1001 independent benchmark$0.18 per solved taskModel BGemini 3.5 Flash LiteGoogle33.6/1001 independent benchmark$0.41 per solved task
Shared results
63
Gemini 3.1 Flash Lite Preview only
14
Gemini 3.5 Flash Lite only
20
Like-for-like categories
7 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

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.

At a glance

Coding index
Gemini 3.1 Flash Lite Preview 8.1 from 1 benchmark, Gemini 3.5 Flash Lite 33.6 from 1 benchmark.
Widest category
Agentic work, 15.9 points apart on average over 5 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): Gemini 3.1 Flash Lite Preview 0.0% against Gemini 3.5 Flash Lite 37.2%, 37.2 points apart on a 0 to 100 scale.
Output price
Gemini 3.1 Flash Lite Preview $1.50 against Gemini 3.5 Flash Lite $2.50 per million output tokens, 1.7x 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
CategoryGemini 3.1 Flash Lite PreviewBarsGemini 3.5 Flash LiteTies
Coding2101 tie
Intelligence01
Agentic work05
Reasoning07
Math02
Knowledge28
General223
All shared boards6561 tie
CodingLike-for-likeFour of these boards feed the Vibe Coding Index210
Coding benchmarks for Gemini 3.1 Flash Lite Preview and Gemini 3.5 Flash Lite
BenchmarkGemini 3.1 Flash Lite PreviewGemini 3.5 Flash LiteLeader
LMArena WebDev12571435Gemini 3.5 Flash Lite
AA Coding Index34.749.3Gemini 3.5 Flash Lite
LiveCodeBench (Vals AI)80.1%79.0%Gemini 3.1 Flash Lite Preview
SWE-bench Verified (Vals AI)62.8%75.0%Gemini 3.5 Flash Lite
Vibe Code Bench (Vals AI)0.0%37.2%Gemini 3.5 Flash Lite
Code migration (Vals AI)4.6%6.2%Gemini 3.5 Flash Lite
ProgramBench (Vals AI)0.0%0.0%Tie
Terminal-Bench 2.1 (Vals AI)34.1%50.2%Gemini 3.5 Flash Lite
CyberBench (Vals AI)Not measured59.1%Only Gemini 3.5 Flash Lite measured
SciCodeNot measured41.3%Only Gemini 3.5 Flash Lite measured
WeirdMLNot measured39.0%Only Gemini 3.5 Flash Lite measured
ALE-Bench797.7765.3Gemini 3.1 Flash Lite Preview
LMArena Text: coding14001453Gemini 3.5 Flash Lite
LMArena Text: software and IT14131451Gemini 3.5 Flash Lite
LMArena WebDev: React12451408Gemini 3.5 Flash Lite
LMArena WebDev: HTML1276Not measuredOnly Gemini 3.1 Flash Lite Preview measured
LMArena WebDev: from an image13361448Gemini 3.5 Flash Lite
Neither model has a result on the other 21 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for Gemini 3.1 Flash Lite Preview and Gemini 3.5 Flash Lite
BenchmarkGemini 3.1 Flash Lite PreviewGemini 3.5 Flash LiteLeader
AA Intelligence Index15.622.2Gemini 3.5 Flash Lite
Epoch Capabilities IndexNot measured144.9Only Gemini 3.5 Flash Lite measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index05
Agentic work benchmarks for Gemini 3.1 Flash Lite Preview and Gemini 3.5 Flash Lite
BenchmarkGemini 3.1 Flash Lite PreviewGemini 3.5 Flash LiteLeader
AA Agentic Index1.614.3Gemini 3.5 Flash Lite
Finance Agent (Vals AI)30.0%47.4%Gemini 3.5 Flash Lite
Tax Agent Bench (Vals AI)3.1%7.2%Gemini 3.5 Flash Lite
Legal Research Bench (Vals AI)3.4%13.9%Gemini 3.5 Flash Lite
Excel Modeling Benchmark (Vals AI)8.6%43.2%Gemini 3.5 Flash Lite
APEX-AgentsNot measured29.3%Only Gemini 3.5 Flash Lite measured
Neither model has a result on the other 33 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index07
Reasoning benchmarks for Gemini 3.1 Flash Lite Preview and Gemini 3.5 Flash Lite
BenchmarkGemini 3.1 Flash Lite PreviewGemini 3.5 Flash LiteLeader
GPQA Diamond81.1%83.8%Gemini 3.5 Flash Lite
MMMU Pro (Vals AI)82.5%83.6%Gemini 3.5 Flash Lite
GPQA Diamond (Artificial Analysis run)Not measured83.8%Only Gemini 3.5 Flash Lite measured
Humanity's Last Exam (Artificial Analysis run)Not measured18.8%Only Gemini 3.5 Flash Lite measured
GPQA Diamond (Epoch AI run)Not measured83.3%Only Gemini 3.5 Flash Lite measured
ARC-AGINot measured53.5%Only Gemini 3.5 Flash Lite measured
ARC-AGI-2Not measured10.3%Only Gemini 3.5 Flash Lite measured
Chess puzzlesNot measured21.0%Only Gemini 3.5 Flash Lite measured
Mystery game puzzlesNot measured19.0%Only Gemini 3.5 Flash Lite measured
LMArena Text: hard prompts14071441Gemini 3.5 Flash Lite
LMArena Text: expert13981434Gemini 3.5 Flash Lite
LMArena Text: hard prompts in English14031440Gemini 3.5 Flash Lite
LMArena Vision: diagrams12421284Gemini 3.5 Flash Lite
LMArena Vision: homework12711291Gemini 3.5 Flash Lite
Neither model has a result on the other 7 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index02
Math benchmarks for Gemini 3.1 Flash Lite Preview and Gemini 3.5 Flash Lite
BenchmarkGemini 3.1 Flash Lite PreviewGemini 3.5 Flash LiteLeader
AIME83.3%Not measuredOnly Gemini 3.1 Flash Lite Preview measured
OTIS Mock AIMENot measured71.1%Only Gemini 3.5 Flash Lite measured
FrontierMath, tiers 1 to 3Not measured26.0%Only Gemini 3.5 Flash Lite measured
FrontierMath, tier 4Not measured0.0%Only Gemini 3.5 Flash Lite measured
ProofBenchNot measured13.0%Only Gemini 3.5 Flash Lite measured
LMArena Text: math14281434Gemini 3.5 Flash Lite
LMArena Text: mathematical work14171433Gemini 3.5 Flash Lite
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index28
Knowledge benchmarks for Gemini 3.1 Flash Lite Preview and Gemini 3.5 Flash Lite
BenchmarkGemini 3.1 Flash Lite PreviewGemini 3.5 Flash LiteLeader
MMLU Pro86.2%85.8%Gemini 3.1 Flash Lite Preview
LegalBench (Vals AI)83.8%84.1%Gemini 3.5 Flash Lite
CaseLaw (Vals AI)55.0%Not measuredOnly Gemini 3.1 Flash Lite Preview measured
CorpFin (Vals AI)59.4%60.7%Gemini 3.5 Flash Lite
TaxEval (Vals AI)71.8%72.6%Gemini 3.5 Flash Lite
MortgageTax (Vals AI)68.0%68.7%Gemini 3.5 Flash Lite
MedCode (Vals AI)47.6%43.5%Gemini 3.1 Flash Lite Preview
LMArena Text: science14251451Gemini 3.5 Flash Lite
LMArena Text: medicine and healthcare14281438Gemini 3.5 Flash Lite
LMArena Text: legal and government14181431Gemini 3.5 Flash Lite
LMArena Text: business and finance13891423Gemini 3.5 Flash Lite
Neither model has a result on the other 6 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
Web design benchmarks for Gemini 3.1 Flash Lite Preview and Gemini 3.5 Flash Lite
BenchmarkGemini 3.1 Flash Lite PreviewGemini 3.5 Flash LiteLeader
Design Arena: websites1083Not measuredOnly Gemini 3.1 Flash Lite Preview measured
Design Arena: UI components1071Not measuredOnly Gemini 3.1 Flash Lite Preview measured
Design Arena: game dev1029Not measuredOnly Gemini 3.1 Flash Lite Preview measured
Design Arena: data viz1045Not measuredOnly Gemini 3.1 Flash Lite Preview measured
Design Arena: 3D1048Not measuredOnly Gemini 3.1 Flash Lite Preview measured
Design Arena: all code categories1072Not measuredOnly Gemini 3.1 Flash Lite Preview measured
Design Arena: SVG1052Not measuredOnly Gemini 3.1 Flash Lite Preview measured
Design Arena: ASCII art1166Not measuredOnly Gemini 3.1 Flash Lite Preview measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index223
General benchmarks for Gemini 3.1 Flash Lite Preview and Gemini 3.5 Flash Lite
BenchmarkGemini 3.1 Flash Lite PreviewGemini 3.5 Flash LiteLeader
Public Benefits Bench (Vals AI)Not measured51.8%Only Gemini 3.5 Flash Lite measured
SAGE (Vals AI)49.5%47.3%Gemini 3.1 Flash Lite Preview
MedScribe (Vals AI)63.9%70.9%Gemini 3.5 Flash Lite
Vals Multimodal Index41.4%Not measuredOnly Gemini 3.1 Flash Lite Preview measured
Long context reasoning (AA-LCR)Not measured76.0%Only Gemini 3.5 Flash Lite measured
DTBenchNot measured83.5%Only Gemini 3.5 Flash Lite measured
LMCANot measured37.6%Only Gemini 3.5 Flash Lite measured
LMArena Text14161435Gemini 3.5 Flash Lite
LMArena Text: instruction following13771419Gemini 3.5 Flash Lite
LMArena Text: creative writing14011421Gemini 3.5 Flash Lite
LMArena Vision12401269Gemini 3.5 Flash Lite
LMArena Text: English14141438Gemini 3.5 Flash Lite
LMArena Text: non-English14101427Gemini 3.5 Flash Lite
LMArena Text: Chinese14601468Gemini 3.5 Flash Lite
LMArena Text: German14301454Gemini 3.5 Flash Lite
LMArena Text: Japanese14131426Gemini 3.5 Flash Lite
LMArena Text: Korean13921407Gemini 3.5 Flash Lite
LMArena Text: French14241451Gemini 3.5 Flash Lite
LMArena Text: Spanish14211441Gemini 3.5 Flash Lite
LMArena Text: Russian14201443Gemini 3.5 Flash Lite
LMArena Text: Polish14431437Gemini 3.1 Flash Lite Preview
LMArena Text: multi-turn14171445Gemini 3.5 Flash Lite
LMArena Text: longer queries13941435Gemini 3.5 Flash Lite
LMArena Text: writing and language14081428Gemini 3.5 Flash Lite
LMArena Text: entertainment and media13861414Gemini 3.5 Flash Lite
LMArena Vision: English12321269Gemini 3.5 Flash Lite
LMArena Vision: Chinese12781311Gemini 3.5 Flash Lite
LMArena Vision: reading text12461280Gemini 3.5 Flash Lite
LMArena Vision: humor12661287Gemini 3.5 Flash Lite
LMArena Vision: captioning1259Not measuredOnly Gemini 3.1 Flash Lite Preview measured
LMArena Vision: recognizing things1308Not measuredOnly Gemini 3.1 Flash Lite Preview measured
LMArena Vision: creative writing12481260Gemini 3.5 Flash Lite
Neither model has a result on the other 14 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Gemini 3.1 Flash Lite Preview and Gemini 3.5 Flash Lite
BenchmarkGemini 3.1 Flash Lite PreviewGemini 3.5 Flash LiteLeader
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

Gemini 3.1 Flash Lite Preview$0.0010Fits in one request
Gemini 3.5 Flash Lite$0.0015Fits in one request

Gemini 3.1 Flash Lite Preview costs less

Repository review

50K input + 3K output tokens

Gemini 3.1 Flash Lite Preview$0.017Fits in one request
Gemini 3.5 Flash Lite$0.022Fits in one request

Gemini 3.1 Flash Lite Preview costs less

Agent loop

200K input + 10K output tokens

Gemini 3.1 Flash Lite Preview$0.065Fits in one request
Gemini 3.5 Flash Lite$0.085Fits in one request

Gemini 3.1 Flash Lite Preview 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 Gemini 3.1 Flash Lite Preview and Gemini 3.5 Flash Lite
SpecificationGoogle Gemini 3.1 Flash Lite PreviewGoogle Gemini 3.5 Flash Lite
MakerGoogleGoogle
WeightsNo public weights listedNo public weights listed
ReleasedMarch 3, 2026July 21, 2026
Context window1.05M1.05M
Input $/Mtok$0.25$0.30
Output $/Mtok$1.50$2.50
Coding index8.133.6
Independent measurements behind it11
Cost per solved task$0.18$0.41
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 3.1 Flash Lite Preview better than Gemini 3.5 Flash Lite for coding?

Pick Gemini 3.5 Flash Lite for coding: it scores 33.6 on the Vibe Coding Index against 8.1 for Gemini 3.1 Flash Lite Preview. Pick Gemini 3.1 Flash Lite Preview when output tokens cost 1.7x less, or when a solved task costs $0.18 against $0.41.

Which is cheaper, Gemini 3.1 Flash Lite Preview or Gemini 3.5 Flash Lite?

Gemini 3.1 Flash Lite Preview costs $0.25 per million input tokens and $1.50 per million output tokens; Gemini 3.5 Flash Lite costs $0.30 and $2.50. Per solved SWE-bench Verified task, Gemini 3.1 Flash Lite Preview costs $0.18 and Gemini 3.5 Flash Lite $0.41.

Which has the bigger context window, Gemini 3.1 Flash Lite Preview or Gemini 3.5 Flash Lite?

Neither: both take 1.05M tokens.

How many benchmarks is the Gemini 3.1 Flash Lite Preview vs Gemini 3.5 Flash Lite comparison based on?

63 benchmarks have a result for both models as of October 21, 2026. Gemini 3.1 Flash Lite Preview's coding index rests on 1 independent benchmark and Gemini 3.5 Flash Lite's on 1. Where only one model has a result, the page says so instead of naming a winner.

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