LLMBenchmark.ai

Enter opens the highlighted result. Esc closes.

Gemini 3.1 Flash Lite Preview vs GPT-5.1

Updated October 21, 2026. 67 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 GPT-5.1
Gemini 3.1 Flash Lite PreviewGoogle
Coding
8.1
Overall
15.6
Output $/M
$1.50
8
GPT-5.1OpenAI
Coding
53.3
Overall
24.7
Output $/M
$10.00
59
vs boards won of 67 shared

Decision reading

Pick GPT-5.1 for coding: it scores 53.3 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 6.7x less, or when a solved task costs $0.18 against $1.02.

Model AGemini 3.1 Flash Lite PreviewGoogle8.1/1001 independent benchmark$0.18 per solved taskModel BGPT-5.1OpenAI53.3/1002 independent benchmarks$1.02 per solved task
Shared results
67
Gemini 3.1 Flash Lite Preview only
10
GPT-5.1 only
33
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, GPT-5.1 53.3 from 2 benchmarks.
Widest category
Coding, 13.4 points apart on average over 10 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): Gemini 3.1 Flash Lite Preview 0.0% against GPT-5.1 24.6%, 24.6 points apart on a 0 to 100 scale.
Output price
Gemini 3.1 Flash Lite Preview $1.50 against GPT-5.1 $10.00 per million output tokens, 6.7x apart.
Context window
Gemini 3.1 Flash Lite Preview takes 1.05M tokens, GPT-5.1 400K.

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 PreviewBarsGPT-5.1Ties
Coding010
Intelligence01
Reasoning07
Math03
Knowledge110
Web design17
General621
All shared boards859
CodingLike-for-likeFour of these boards feed the Vibe Coding Index010
Coding benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5.1
BenchmarkGemini 3.1 Flash Lite PreviewGPT-5.1Leader
SWE-bench VerifiedNot measured66.0%Only GPT-5.1 measured
LMArena WebDev12571396GPT-5.1
AA Coding Index34.749.4GPT-5.1
LiveCodeBench (Vals AI)80.1%86.5%GPT-5.1
SWE-bench Verified (Vals AI)62.8%69.8%GPT-5.1
Vibe Code Bench (Vals AI)0.0%24.6%GPT-5.1
Code migration (Vals AI)4.6%Not measuredOnly Gemini 3.1 Flash Lite Preview measured
ProgramBench (Vals AI)0.0%Not measuredOnly Gemini 3.1 Flash Lite Preview measured
Terminal-Bench 2.1 (Vals AI)34.1%Not measuredOnly Gemini 3.1 Flash Lite Preview measured
LiveCodeBench (Artificial Analysis run)Not measured86.8%Only GPT-5.1 measured
Terminal-Bench Hard (Artificial Analysis run)Not measured45.5%Only GPT-5.1 measured
Terminal-BenchNot measured47.6%Only GPT-5.1 measured
GSO-BenchNot measured13.7%Only GPT-5.1 measured
WeirdMLNot measured60.8%Only GPT-5.1 measured
ALE-Bench797.7Not measuredOnly Gemini 3.1 Flash Lite Preview measured
LMArena Text: coding14001453GPT-5.1
LMArena Text: software and IT14131454GPT-5.1
LMArena WebDev: React12451307GPT-5.1
LMArena WebDev: HTML12761405GPT-5.1
LMArena WebDev: from an image13361421GPT-5.1
Neither model has a result on the other 18 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5.1
BenchmarkGemini 3.1 Flash Lite PreviewGPT-5.1Leader
AA Intelligence Index15.624.7GPT-5.1
Epoch Capabilities IndexNot measured149.8Only GPT-5.1 measured
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
Agentic work benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5.1
BenchmarkGemini 3.1 Flash Lite PreviewGPT-5.1Leader
AA Agentic Index1.6Not measuredOnly Gemini 3.1 Flash Lite Preview measured
Finance Agent (Vals AI)30.0%Not measuredOnly Gemini 3.1 Flash Lite Preview measured
Tax Agent Bench (Vals AI)3.1%Not measuredOnly Gemini 3.1 Flash Lite Preview measured
Legal Research Bench (Vals AI)3.4%Not measuredOnly Gemini 3.1 Flash Lite Preview measured
Excel Modeling Benchmark (Vals AI)8.6%Not measuredOnly Gemini 3.1 Flash Lite Preview measured
τ²-Bench TelecomNot measured81.9%Only GPT-5.1 measured
DeepResearch BenchNot measured42.8%Only GPT-5.1 measured
Vending-Bench 2Not measured$1,473Only GPT-5.1 measured
Neither model has a result on the other 31 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index07
Reasoning benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5.1
BenchmarkGemini 3.1 Flash Lite PreviewGPT-5.1Leader
GPQA Diamond81.1%86.6%GPT-5.1
MMMU Pro (Vals AI)82.5%83.2%GPT-5.1
GPQA Diamond (Artificial Analysis run)Not measured87.3%Only GPT-5.1 measured
Humanity's Last Exam (Artificial Analysis run)Not measured28.5%Only GPT-5.1 measured
GPQA Diamond (Epoch AI run)Not measured87.6%Only GPT-5.1 measured
ARC-AGINot measured72.8%Only GPT-5.1 measured
ARC-AGI-2Not measured17.6%Only GPT-5.1 measured
SimpleBenchNot measured53.2%Only GPT-5.1 measured
Chess puzzlesNot measured42.0%Only GPT-5.1 measured
Mystery game puzzlesNot measured19.0%Only GPT-5.1 measured
VPCTNot measured58.7%Only GPT-5.1 measured
LMArena Text: hard prompts14071457GPT-5.1
LMArena Text: expert13981470GPT-5.1
LMArena Text: hard prompts in English14031462GPT-5.1
LMArena Vision: diagrams12421264GPT-5.1
LMArena Vision: homework12711272GPT-5.1
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index03
Math benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5.1
BenchmarkGemini 3.1 Flash Lite PreviewGPT-5.1Leader
AIME83.3%93.3%GPT-5.1
MGSM (Vals AI)Not measured93.0%Only GPT-5.1 measured
AA Math IndexNot measured94.0Only GPT-5.1 measured
AIME 2025 (Artificial Analysis run)Not measured94.0%Only GPT-5.1 measured
OTIS Mock AIMENot measured88.6%Only GPT-5.1 measured
LMArena Text: math14281446GPT-5.1
LMArena Text: mathematical work14171449GPT-5.1
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index110
Knowledge benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5.1
BenchmarkGemini 3.1 Flash Lite PreviewGPT-5.1Leader
MMLU Pro86.2%86.4%GPT-5.1
LegalBench (Vals AI)83.8%85.7%GPT-5.1
CaseLaw (Vals AI)55.0%73.4%GPT-5.1
CorpFin (Vals AI)59.4%63.8%GPT-5.1
TaxEval (Vals AI)71.8%74.9%GPT-5.1
MortgageTax (Vals AI)68.0%61.4%Gemini 3.1 Flash Lite Preview
MedQA (Vals AI)Not measured96.4%Only GPT-5.1 measured
MedCode (Vals AI)47.6%52.7%GPT-5.1
MMLU Pro (Artificial Analysis run)Not measured87.0%Only GPT-5.1 measured
SimpleQA VerifiedNot measured48.0%Only GPT-5.1 measured
LMArena Text: science14251459GPT-5.1
LMArena Text: medicine and healthcare14281456GPT-5.1
LMArena Text: legal and government14181459GPT-5.1
LMArena Text: business and finance13891431GPT-5.1
Neither model has a result on the other 3 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index17
Web design benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5.1
BenchmarkGemini 3.1 Flash Lite PreviewGPT-5.1Leader
Design Arena: websites10831187GPT-5.1
Design Arena: UI components10711166GPT-5.1
Design Arena: game dev10291179GPT-5.1
Design Arena: data viz10451204GPT-5.1
Design Arena: 3D10481061GPT-5.1
Design Arena: all code categories10721171GPT-5.1
Design Arena: SVG10521149GPT-5.1
Design Arena: ASCII art11661118Gemini 3.1 Flash Lite Preview
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index621
General benchmarks for Gemini 3.1 Flash Lite Preview and GPT-5.1
BenchmarkGemini 3.1 Flash Lite PreviewGPT-5.1Leader
SAGE (Vals AI)49.5%43.2%Gemini 3.1 Flash Lite Preview
MedScribe (Vals AI)63.9%88.1%GPT-5.1
Vals Multimodal Index41.4%Not measuredOnly Gemini 3.1 Flash Lite Preview measured
IFBenchNot measured72.9%Only GPT-5.1 measured
Long context reasoning (AA-LCR)Not measured80.0%Only GPT-5.1 measured
DTBenchNot measured90.1%Only GPT-5.1 measured
LMCANot measured43.9%Only GPT-5.1 measured
CL-benchNot measured23.7%Only GPT-5.1 measured
CL-bench LifeNot measured17.3%Only GPT-5.1 measured
LMArena Text14161443GPT-5.1
LMArena Text: instruction following13771443GPT-5.1
LMArena Text: creative writing14011427GPT-5.1
LMArena Vision12401250GPT-5.1
LMArena Text: English14141451GPT-5.1
LMArena Text: non-English14101431GPT-5.1
LMArena Text: Chinese14601495GPT-5.1
LMArena Text: German14301438GPT-5.1
LMArena Text: Japanese14131453GPT-5.1
LMArena Text: Korean13921401GPT-5.1
LMArena Text: French14241450GPT-5.1
LMArena Text: Spanish14211433GPT-5.1
LMArena Text: Russian14201435GPT-5.1
LMArena Text: Polish14431440Gemini 3.1 Flash Lite Preview
LMArena Text: multi-turn14171450GPT-5.1
LMArena Text: longer queries13941448GPT-5.1
LMArena Text: writing and language14081428GPT-5.1
LMArena Text: entertainment and media13861415GPT-5.1
LMArena Vision: English12321252GPT-5.1
LMArena Vision: Chinese12781270Gemini 3.1 Flash Lite Preview
LMArena Vision: reading text12461255GPT-5.1
LMArena Vision: humor12661263Gemini 3.1 Flash Lite Preview
LMArena Vision: captioning12591252Gemini 3.1 Flash Lite Preview
LMArena Vision: recognizing things13081232Gemini 3.1 Flash Lite Preview
LMArena Vision: creative writing12481266GPT-5.1
LMArena DocumentNot measured1403Only GPT-5.1 measured
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 Gemini 3.1 Flash Lite Preview and GPT-5.1
BenchmarkGemini 3.1 Flash Lite PreviewGPT-5.1Leader
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
GPT-5.1$0.0063Fits 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
GPT-5.1$0.092Fits 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
GPT-5.1$0.350Fits 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 GPT-5.1
SpecificationGoogle Gemini 3.1 Flash Lite PreviewOpenAI GPT-5.1
MakerGoogleOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedMarch 3, 2026November 13, 2025
Context window1.05M400K
Input $/Mtok$0.25$1.25
Output $/Mtok$1.50$10.00
Coding index8.153.3
Independent measurements behind it12
Cost per solved task$0.18$1.02
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 3.1 Flash Lite Preview better than GPT-5.1 for coding?

Pick GPT-5.1 for coding: it scores 53.3 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 6.7x less, or when a solved task costs $0.18 against $1.02.

Which is cheaper, Gemini 3.1 Flash Lite Preview or GPT-5.1?

Gemini 3.1 Flash Lite Preview costs $0.25 per million input tokens and $1.50 per million output tokens; GPT-5.1 costs $1.25 and $10.00. Per solved SWE-bench Verified task, Gemini 3.1 Flash Lite Preview costs $0.18 and GPT-5.1 $1.02.

Which has the bigger context window, Gemini 3.1 Flash Lite Preview or GPT-5.1?

Gemini 3.1 Flash Lite Preview, with 1.05M tokens against 400K.

How many benchmarks is the Gemini 3.1 Flash Lite Preview vs GPT-5.1 comparison based on?

67 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 GPT-5.1's on 2. Where only one model has a result, the page says so instead of naming a winner.

Compare next