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Gemini 3.5 Flash Lite vs GPT-5.1

Gemini 3.5 Flash Lite leads GPT-5.1 on coding, 49.0 to 40.4 on the Vibe Coding Index, and Gemini 3.5 Flash Lite costs 4.0x less per output token ($2.50 vs $10.00 per million). Updated October 22, 2026; 68 benchmarks have a result for both.

Replace Gemini 3.5 Flash Lite Replace GPT-5.1
Gemini 3.5 Flash LiteGoogle
Coding
49.0
Overall
49.8
Output $/M
$2.50
21
GPT-5.1OpenAI
Coding
40.4
Overall
55.0
Output $/M
$10.00
46
vs boards won of 68 shared, 1 tied

Gemini 3.5 Flash Lite or GPT-5.1: which to pick

Pick Gemini 3.5 Flash Lite for coding: it scores 49.0 on the Vibe Coding Index against 40.4 for GPT-5.1.

Pick GPT-5.1 for work measured by AA Coding Index or LiveCodeBench (Vals AI), where it leads.

Model AGemini 3.5 Flash LiteGoogle49.0/1003 independent benchmarks$0.41 per solved taskModel BGPT-5.1OpenAI40.4/1003 independent benchmarks$1.02 per solved task
Shared results
68
Gemini 3.5 Flash Lite only
17
GPT-5.1 only
33
Like-for-like categories
6 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.

At a glance

Coding index
Gemini 3.5 Flash Lite 49.0 from 3 benchmarks, GPT-5.1 40.4 from 3 benchmarks.
Widest category
Coding, 7.5 points apart on average over 10 shared benchmarks.
Widest single gap
WeirdML: Gemini 3.5 Flash Lite 39.0% against GPT-5.1 60.8%, 21.8 points apart on a 0 to 100 scale.
Output price
Gemini 3.5 Flash Lite $2.50 against GPT-5.1 $10.00 per million output tokens, 4.0x apart.
Context window
Gemini 3.5 Flash Lite 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 3.5 Flash LiteBarsGPT-5.1Ties
Coding55
Intelligence02
Reasoning3101 tie
Math03
Knowledge29
General1117
All shared boards21461 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index55
Coding benchmarks for Gemini 3.5 Flash Lite and GPT-5.1
BenchmarkGemini 3.5 Flash LiteGPT-5.1Leader
SWE-bench VerifiedNot measured66.0%Only GPT-5.1 measured
LMArena WebDev14351396Gemini 3.5 Flash Lite
AA Coding Index49.349.4GPT-5.1
LiveCodeBench (Vals AI)79.0%86.5%GPT-5.1
SWE-bench Verified (Vals AI)75.0%69.8%Gemini 3.5 Flash Lite
Vibe Code Bench (Vals AI)37.2%24.6%Gemini 3.5 Flash Lite
Code migration (Vals AI)6.2%Not measuredOnly Gemini 3.5 Flash Lite measured
ProgramBench (Vals AI)0.0%Not measuredOnly Gemini 3.5 Flash Lite measured
Terminal-Bench 2.1 (Vals AI)50.2%Not measuredOnly Gemini 3.5 Flash Lite measured
CyberBench (Vals AI)59.1%Not measuredOnly Gemini 3.5 Flash Lite measured
LiveCodeBench (Artificial Analysis run)Not measured86.8%Only GPT-5.1 measured
SciCode41.3%Not measuredOnly Gemini 3.5 Flash Lite 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
WeirdML39.0%60.8%GPT-5.1
ALE-Bench765.3Not measuredOnly Gemini 3.5 Flash Lite measured
LMArena Text: coding14531453GPT-5.1
LMArena Text: software and IT14511454GPT-5.1
LMArena WebDev: React14081307Gemini 3.5 Flash Lite
LMArena WebDev: HTMLNot measured1405Only GPT-5.1 measured
LMArena WebDev: from an image14481421Gemini 3.5 Flash Lite
SciCode6.2%Not measuredOnly Gemini 3.5 Flash Lite measured
Neither model has a result on the other 16 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Gemini 3.5 Flash Lite and GPT-5.1
BenchmarkGemini 3.5 Flash LiteGPT-5.1Leader
AA Intelligence Index22.224.7GPT-5.1
Epoch Capabilities Index144.9149.8GPT-5.1
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index9 boards, none shared
Agentic work benchmarks for Gemini 3.5 Flash Lite and GPT-5.1
BenchmarkGemini 3.5 Flash LiteGPT-5.1Leader
AA Agentic Index14.3Not measuredOnly Gemini 3.5 Flash Lite measured
Finance Agent (Vals AI)47.4%Not measuredOnly Gemini 3.5 Flash Lite measured
Tax Agent Bench (Vals AI)7.2%Not measuredOnly Gemini 3.5 Flash Lite measured
Legal Research Bench (Vals AI)13.9%Not measuredOnly Gemini 3.5 Flash Lite measured
Excel Modeling Benchmark (Vals AI)43.2%Not measuredOnly Gemini 3.5 Flash Lite measured
τ²-Bench TelecomNot measured81.9%Only GPT-5.1 measured
APEX-Agents29.3%Not measuredOnly Gemini 3.5 Flash Lite 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 32 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index310
Reasoning benchmarks for Gemini 3.5 Flash Lite and GPT-5.1
BenchmarkGemini 3.5 Flash LiteGPT-5.1Leader
GPQA Diamond83.8%86.6%GPT-5.1
MMMU Pro (Vals AI)83.6%83.2%Gemini 3.5 Flash Lite
GPQA Diamond (Artificial Analysis run)83.8%87.3%GPT-5.1
Humanity's Last Exam (Artificial Analysis run)18.8%28.5%GPT-5.1
GPQA Diamond (Epoch AI run)83.3%87.6%GPT-5.1
ARC-AGI53.5%72.8%GPT-5.1
ARC-AGI-210.3%17.6%GPT-5.1
SimpleBenchNot measured53.2%Only GPT-5.1 measured
Chess puzzles21.0%42.0%GPT-5.1
Mystery game puzzles19.0%19.0%Tie
VPCTNot measured58.7%Only GPT-5.1 measured
LMArena Text: hard prompts14411457GPT-5.1
LMArena Text: expert14341470GPT-5.1
LMArena Text: hard prompts in English14401462GPT-5.1
LMArena Vision: diagrams12841264Gemini 3.5 Flash Lite
LMArena Vision: homework12911272Gemini 3.5 Flash Lite
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index03
Math benchmarks for Gemini 3.5 Flash Lite and GPT-5.1
BenchmarkGemini 3.5 Flash LiteGPT-5.1Leader
AIMENot measured93.3%Only GPT-5.1 measured
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 AIME71.1%88.6%GPT-5.1
FrontierMath, tiers 1 to 326.0%Not measuredOnly Gemini 3.5 Flash Lite measured
FrontierMath, tier 40.0%Not measuredOnly Gemini 3.5 Flash Lite measured
ProofBench13.0%Not measuredOnly Gemini 3.5 Flash Lite measured
LMArena Text: math14341446GPT-5.1
LMArena Text: mathematical work14331449GPT-5.1
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index29
Knowledge benchmarks for Gemini 3.5 Flash Lite and GPT-5.1
BenchmarkGemini 3.5 Flash LiteGPT-5.1Leader
MMLU Pro85.8%86.4%GPT-5.1
LegalBench (Vals AI)84.1%85.7%GPT-5.1
CaseLaw (Vals AI)Not measured73.4%Only GPT-5.1 measured
CorpFin (Vals AI)60.7%63.8%GPT-5.1
TaxEval (Vals AI)72.6%74.9%GPT-5.1
MortgageTax (Vals AI)68.7%61.4%Gemini 3.5 Flash Lite
MedQA (Vals AI)Not measured96.4%Only GPT-5.1 measured
MedCode (Vals AI)43.5%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: science14511459GPT-5.1
LMArena Text: medicine and healthcare14381456GPT-5.1
LMArena Text: legal and government14311459GPT-5.1
LMArena Text: business and finance14231431GPT-5.1
FACTS Benchmark Suite53.5%45.0%Gemini 3.5 Flash Lite
Neither model has a result on the other 3 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
Web design benchmarks for Gemini 3.5 Flash Lite and GPT-5.1
BenchmarkGemini 3.5 Flash LiteGPT-5.1Leader
Design Arena: websitesNot measured1187Only GPT-5.1 measured
Design Arena: UI componentsNot measured1163Only GPT-5.1 measured
Design Arena: game devNot measured1178Only GPT-5.1 measured
Design Arena: data vizNot measured1204Only GPT-5.1 measured
Design Arena: 3DNot measured1060Only GPT-5.1 measured
Design Arena: all code categoriesNot measured1170Only GPT-5.1 measured
Design Arena: SVGNot measured1149Only GPT-5.1 measured
Design Arena: ASCII artNot measured1119Only GPT-5.1 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index1117
General benchmarks for Gemini 3.5 Flash Lite and GPT-5.1
BenchmarkGemini 3.5 Flash LiteGPT-5.1Leader
Public Benefits Bench (Vals AI)51.8%Not measuredOnly Gemini 3.5 Flash Lite measured
SAGE (Vals AI)47.3%43.2%Gemini 3.5 Flash Lite
MedScribe (Vals AI)70.9%88.1%GPT-5.1
IFBenchNot measured72.9%Only GPT-5.1 measured
Long context reasoning (AA-LCR)76.0%80.0%GPT-5.1
DTBench83.5%90.1%GPT-5.1
LMCA37.6%43.9%GPT-5.1
CL-benchNot measured23.7%Only GPT-5.1 measured
CL-bench LifeNot measured17.3%Only GPT-5.1 measured
LMArena Text14351443GPT-5.1
LMArena Text: instruction following14191443GPT-5.1
LMArena Text: creative writing14211427GPT-5.1
LMArena Vision12691250Gemini 3.5 Flash Lite
LMArena Text: English14381451GPT-5.1
LMArena Text: non-English14271431GPT-5.1
LMArena Text: Chinese14681495GPT-5.1
LMArena Text: German14541438Gemini 3.5 Flash Lite
LMArena Text: Japanese14261453GPT-5.1
LMArena Text: Korean14071401Gemini 3.5 Flash Lite
LMArena Text: French14511450Gemini 3.5 Flash Lite
LMArena Text: Spanish14411433Gemini 3.5 Flash Lite
LMArena Text: Russian14431435Gemini 3.5 Flash Lite
LMArena Text: Polish14371440GPT-5.1
LMArena Text: multi-turn14451450GPT-5.1
LMArena Text: longer queries14351448GPT-5.1
LMArena Text: writing and language14281428GPT-5.1
LMArena Text: entertainment and media14141415GPT-5.1
LMArena Vision: English12691252Gemini 3.5 Flash Lite
LMArena Vision: Chinese13111270Gemini 3.5 Flash Lite
LMArena Vision: reading text12801255Gemini 3.5 Flash Lite
LMArena Vision: humor12871263Gemini 3.5 Flash Lite
LMArena Vision: captioningNot measured1252Only GPT-5.1 measured
LMArena Vision: recognizing thingsNot measured1232Only GPT-5.1 measured
LMArena Vision: creative writing12601266GPT-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 3.5 Flash Lite and GPT-5.1
BenchmarkGemini 3.5 Flash LiteGPT-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 3.5 Flash Lite$0.0015Fits in one request
GPT-5.1$0.0063Fits in one request

Gemini 3.5 Flash Lite costs less

Repository review

50K input + 3K output tokens

Gemini 3.5 Flash Lite$0.022Fits in one request
GPT-5.1$0.092Fits in one request

Gemini 3.5 Flash Lite costs less

Agent loop

200K input + 10K output tokens

Gemini 3.5 Flash Lite$0.085Fits in one request
GPT-5.1$0.350Fits in one request

Gemini 3.5 Flash Lite 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 3.5 Flash Lite and GPT-5.1
SpecificationGoogle Gemini 3.5 Flash LiteOpenAI GPT-5.1
MakerGoogleOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedJuly 21, 2026November 13, 2025
Context window1.05M400K
Input $/Mtok$0.30$1.25
Output $/Mtok$2.50$10.00
Coding index49.040.4
Independent measurements behind it33
Cost per solved task$0.41$1.02
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 3.5 Flash Lite better than GPT-5.1 for coding?

Pick Gemini 3.5 Flash Lite for coding: it scores 49.0 on the Vibe Coding Index against 40.4 for GPT-5.1. Pick GPT-5.1 for work measured by AA Coding Index or LiveCodeBench (Vals AI), where it leads.

Which is cheaper, Gemini 3.5 Flash Lite or GPT-5.1?

Gemini 3.5 Flash Lite costs $0.30 per million input tokens and $2.50 per million output tokens; GPT-5.1 costs $1.25 and $10.00. Per solved SWE-bench Verified task, Gemini 3.5 Flash Lite costs $0.41 and GPT-5.1 $1.02.

Which has the bigger context window, Gemini 3.5 Flash Lite or GPT-5.1?

Gemini 3.5 Flash Lite, with 1.05M tokens against 400K.

How many benchmarks is the Gemini 3.5 Flash Lite vs GPT-5.1 comparison based on?

68 benchmarks have a result for both models as of October 22, 2026. Gemini 3.5 Flash Lite's coding index rests on 3 independent benchmarks and GPT-5.1's on 3. Where only one model has a result, the page says so instead of naming a winner.

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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/gemini-3-5-flash-lite-vs-gpt-5-1">LLMBenchmark.ai, Gemini 3.5 Flash Lite vs GPT-5.1</a></p>