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Gemini 3.5 Flash Lite vs GPT-6 Luna

Updated October 21, 2026. 69 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Gemini 3.5 Flash Lite Replace GPT-6 Luna
Gemini 3.5 Flash LiteGoogle
Coding
33.6
Overall
22.2
Output $/M
$2.50
35
GPT-6 LunaOpenAI
Coding
71.4
Overall
38.1
Output $/M
$0.50
34
vs boards won of 69 shared

Decision reading

Pick GPT-6 Luna for coding: it scores 71.4 on the Vibe Coding Index against 33.6 for Gemini 3.5 Flash Lite.

Pick Gemini 3.5 Flash Lite when what matters is LMArena Text: coding or LMArena Text: software and IT, where it leads.

Model AGemini 3.5 Flash LiteGoogle33.6/1001 independent benchmark$0.41 per solved taskModel BGPT-6 LunaOpenAI71.4/1002 independent benchmarksNo cost per solved task
Shared results
69
Gemini 3.5 Flash Lite only
14
GPT-6 Luna 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 3.5 Flash Lite 33.6 from 1 benchmark, GPT-6 Luna 71.4 from 2 benchmarks.
Widest category
Math, 32.2 points apart on average over 6 shared benchmarks.
Widest single gap
FrontierMath, tier 4: Gemini 3.5 Flash Lite 0.0% against GPT-6 Luna 56.1%, 56.1 points apart on a 0 to 100 scale.
Output price
Gemini 3.5 Flash Lite $2.50 against GPT-6 Luna $0.50 per million output tokens, 5.0x apart.
Context window
Gemini 3.5 Flash Lite takes 1.05M tokens, GPT-6 Luna 1.05M.

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-6 LunaTies
Coding210
Intelligence02
Agentic work05
Reasoning56
Math24
Knowledge41
General226
All shared boards3534
CodingLike-for-likeFour of these boards feed the Vibe Coding Index210
Coding benchmarks for Gemini 3.5 Flash Lite and GPT-6 Luna
BenchmarkGemini 3.5 Flash LiteGPT-6 LunaLeader
LiveBench codingNot measured84.5%Only GPT-6 Luna measured
LMArena WebDev14351578GPT-6 Luna
AA Coding Index49.3Not measuredOnly Gemini 3.5 Flash Lite measured
LiveCodeBench (Vals AI)79.0%Not measuredOnly Gemini 3.5 Flash Lite measured
SWE-bench Verified (Vals AI)75.0%Not measuredOnly Gemini 3.5 Flash Lite measured
Terminal-Bench 4 (Vals AI)Not measured13.6%Only GPT-6 Luna measured
Vibe Code Bench (Vals AI)37.2%81.7%GPT-6 Luna
Code migration (Vals AI)6.2%42.5%GPT-6 Luna
ProgramBench (Vals AI)0.0%0.5%GPT-6 Luna
IOI (Vals AI)Not measured55.6%Only GPT-6 Luna measured
Terminal-Bench 2.1 (Vals AI)50.2%73.0%GPT-6 Luna
SWE-bench Multimodal (Vals AI)Not measured37.5%Only GPT-6 Luna measured
CyberBench (Vals AI)59.1%76.3%GPT-6 Luna
SciCode41.3%54.6%GPT-6 Luna
FrontierCodeNot measured42.4%Only GPT-6 Luna measured
WeirdML39.0%Not measuredOnly Gemini 3.5 Flash Lite measured
ALE-Bench765.31576.9GPT-6 Luna
LMArena Text: coding14531437Gemini 3.5 Flash Lite
LMArena Text: software and IT14511423Gemini 3.5 Flash Lite
LMArena WebDev: React14081573GPT-6 Luna
LMArena WebDev: HTMLNot measured1595Only GPT-6 Luna measured
LMArena WebDev: from an image14481571GPT-6 Luna
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-6 Luna
BenchmarkGemini 3.5 Flash LiteGPT-6 LunaLeader
AA Intelligence Index22.238.1GPT-6 Luna
Epoch Capabilities Index144.9156.8GPT-6 Luna
Agentic workLike-for-likePublic boards, shown as published, kept out of the index05
Agentic work benchmarks for Gemini 3.5 Flash Lite and GPT-6 Luna
BenchmarkGemini 3.5 Flash LiteGPT-6 LunaLeader
AA Agentic Index14.3Not measuredOnly Gemini 3.5 Flash Lite measured
Design Arena: agents building web appsNot measured1189Only GPT-6 Luna measured
Design Arena: agents building full-stack appsNot measured1158Only GPT-6 Luna measured
Design Arena: agents building mobile appsNot measured1133Only GPT-6 Luna measured
LiveBench researchNot measured43.5%Only GPT-6 Luna measured
LiveBench browserNot measured72.0%Only GPT-6 Luna measured
LiveBench long agenticNot measured48.1%Only GPT-6 Luna measured
SREBench (Vals AI)Not measured2.7%Only GPT-6 Luna measured
Finance Agent (Vals AI)47.4%49.9%GPT-6 Luna
Tax Agent Bench (Vals AI)7.2%19.9%GPT-6 Luna
Legal Research Bench (Vals AI)13.9%30.3%GPT-6 Luna
Harvey's Legal Agent Benchmark (Vals AI)Not measured4.2%Only GPT-6 Luna measured
Excel Modeling Benchmark (Vals AI)43.2%68.5%GPT-6 Luna
BioMysteryBench (Vals AI)Not measured61.5%Only GPT-6 Luna measured
Terminal-Bench-Science (Vals AI)Not measured4.3%Only GPT-6 Luna measured
Vals Science IndexNot measured28.4%Only GPT-6 Luna measured
APEX-Agents29.3%44.3%GPT-6 Luna
SpireClimbNot measured0.0%Only GPT-6 Luna measured
Neither model has a result on the other 21 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index56
Reasoning benchmarks for Gemini 3.5 Flash Lite and GPT-6 Luna
BenchmarkGemini 3.5 Flash LiteGPT-6 LunaLeader
GPQA Diamond83.8%Not measuredOnly Gemini 3.5 Flash Lite measured
LiveBench reasoningNot measured81.8%Only GPT-6 Luna measured
MysteryMechanism (Vals AI)Not measured19.4%Only GPT-6 Luna measured
MMMU Pro (Vals AI)83.6%Not measuredOnly Gemini 3.5 Flash Lite measured
GPQA Diamond (Artificial Analysis run)83.8%Not measuredOnly Gemini 3.5 Flash Lite measured
Humanity's Last Exam (Artificial Analysis run)18.8%38.5%GPT-6 Luna
GPQA Diamond (Epoch AI run)83.3%90.5%GPT-6 Luna
ARC-AGI53.5%86.7%GPT-6 Luna
ARC-AGI-210.3%59.3%GPT-6 Luna
Chess puzzles21.0%36.0%GPT-6 Luna
Mystery game puzzles19.0%7.0%Gemini 3.5 Flash Lite
LMArena Text: hard prompts14411410Gemini 3.5 Flash Lite
LMArena Text: expert14341442GPT-6 Luna
LMArena Text: hard prompts in English14401410Gemini 3.5 Flash Lite
LMArena Vision: diagrams12841245Gemini 3.5 Flash Lite
LMArena Vision: homework12911261Gemini 3.5 Flash Lite
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index24
Math benchmarks for Gemini 3.5 Flash Lite and GPT-6 Luna
BenchmarkGemini 3.5 Flash LiteGPT-6 LunaLeader
OTIS Mock AIME71.1%98.9%GPT-6 Luna
FrontierMath, tiers 1 to 326.0%78.9%GPT-6 Luna
FrontierMath, tier 40.0%56.1%GPT-6 Luna
ProofBench13.0%64.0%GPT-6 Luna
LMArena Text: math14341409Gemini 3.5 Flash Lite
LMArena Text: mathematical work14331427Gemini 3.5 Flash Lite
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index41
Knowledge benchmarks for Gemini 3.5 Flash Lite and GPT-6 Luna
BenchmarkGemini 3.5 Flash LiteGPT-6 LunaLeader
MMLU Pro85.8%Not measuredOnly Gemini 3.5 Flash Lite measured
LegalBench (Vals AI)84.1%Not measuredOnly Gemini 3.5 Flash Lite measured
CorpFin (Vals AI)60.7%Not measuredOnly Gemini 3.5 Flash Lite measured
TaxEval (Vals AI)72.6%Not measuredOnly Gemini 3.5 Flash Lite measured
MortgageTax (Vals AI)68.7%Not measuredOnly Gemini 3.5 Flash Lite measured
MedCode (Vals AI)43.5%44.7%GPT-6 Luna
SimpleQA VerifiedNot measured41.4%Only GPT-6 Luna measured
LMArena Text: science14511386Gemini 3.5 Flash Lite
LMArena Text: medicine and healthcare14381352Gemini 3.5 Flash Lite
LMArena Text: legal and government14311400Gemini 3.5 Flash Lite
LMArena Text: business and finance14231388Gemini 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 index9 boards, none shared
Web design benchmarks for Gemini 3.5 Flash Lite and GPT-6 Luna
BenchmarkGemini 3.5 Flash LiteGPT-6 LunaLeader
Design Arena: websitesNot measured1272Only GPT-6 Luna measured
Design Arena: UI componentsNot measured1297Only GPT-6 Luna measured
Design Arena: game devNot measured1259Only GPT-6 Luna measured
Design Arena: data vizNot measured1215Only GPT-6 Luna measured
Design Arena: 3DNot measured1217Only GPT-6 Luna measured
Design Arena: all code categoriesNot measured1271Only GPT-6 Luna measured
Design Arena: SVGNot measured1253Only GPT-6 Luna measured
Design Arena: ASCII artNot measured1156Only GPT-6 Luna measured
LiveBench designNot measured82.5%Only GPT-6 Luna measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index226
General benchmarks for Gemini 3.5 Flash Lite and GPT-6 Luna
BenchmarkGemini 3.5 Flash LiteGPT-6 LunaLeader
Vals IndexNot measured52.3%Only GPT-6 Luna measured
LiveBench data analysisNot measured73.4%Only GPT-6 Luna measured
Public Benefits Bench (Vals AI)51.8%57.6%GPT-6 Luna
SAGE (Vals AI)47.3%48.1%GPT-6 Luna
MedScribe (Vals AI)70.9%83.7%GPT-6 Luna
Long context reasoning (AA-LCR)76.0%83.3%GPT-6 Luna
DTBench83.5%90.1%GPT-6 Luna
LMCA37.6%44.5%GPT-6 Luna
Furniture assemblyNot measured44.2%Only GPT-6 Luna measured
LMArena Text14351389Gemini 3.5 Flash Lite
LMArena Text: instruction following14191408Gemini 3.5 Flash Lite
LMArena Text: creative writing14211363Gemini 3.5 Flash Lite
LMArena Vision12691216Gemini 3.5 Flash Lite
LMArena Text: English14381393Gemini 3.5 Flash Lite
LMArena Text: non-English14271381Gemini 3.5 Flash Lite
LMArena Text: Chinese14681427Gemini 3.5 Flash Lite
LMArena Text: German14541376Gemini 3.5 Flash Lite
LMArena Text: Japanese14261369Gemini 3.5 Flash Lite
LMArena Text: Korean14071359Gemini 3.5 Flash Lite
LMArena Text: French14511408Gemini 3.5 Flash Lite
LMArena Text: Spanish14411391Gemini 3.5 Flash Lite
LMArena Text: Russian14431392Gemini 3.5 Flash Lite
LMArena Text: Polish14371383Gemini 3.5 Flash Lite
LMArena Text: multi-turn14451392Gemini 3.5 Flash Lite
LMArena Text: longer queries14351408Gemini 3.5 Flash Lite
LMArena Text: writing and language14281384Gemini 3.5 Flash Lite
LMArena Text: entertainment and media14141364Gemini 3.5 Flash Lite
LMArena Vision: English12691204Gemini 3.5 Flash Lite
LMArena Vision: Chinese13111266Gemini 3.5 Flash Lite
LMArena Vision: reading text12801225Gemini 3.5 Flash Lite
LMArena Vision: humor1287Not measuredOnly Gemini 3.5 Flash Lite measured
LMArena Vision: creative writing12601205Gemini 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 3.5 Flash Lite and GPT-6 Luna
BenchmarkGemini 3.5 Flash LiteGPT-6 LunaLeader
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-6 Luna$0.0003Fits in one request

GPT-6 Luna costs less

Repository review

50K input + 3K output tokens

Gemini 3.5 Flash Lite$0.022Fits in one request
GPT-6 Luna$0.0065Fits in one request

GPT-6 Luna costs less

Agent loop

200K input + 10K output tokens

Gemini 3.5 Flash Lite$0.085Fits in one request
GPT-6 Luna$0.025Fits in one request

GPT-6 Luna 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-6 Luna
SpecificationGoogle Gemini 3.5 Flash LiteOpenAI GPT-6 Luna
MakerGoogleOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedJuly 21, 2026September 22, 2026
Context window1.05M1.05M
Input $/Mtok$0.30$0.10
Output $/Mtok$2.50$0.50
Coding index33.671.4
Independent measurements behind it12
Cost per solved task$0.41Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 3.5 Flash Lite better than GPT-6 Luna for coding?

Pick GPT-6 Luna for coding: it scores 71.4 on the Vibe Coding Index against 33.6 for Gemini 3.5 Flash Lite. Pick Gemini 3.5 Flash Lite when what matters is LMArena Text: coding or LMArena Text: software and IT, where it leads.

Which is cheaper, Gemini 3.5 Flash Lite or GPT-6 Luna?

Gemini 3.5 Flash Lite costs $0.30 per million input tokens and $2.50 per million output tokens; GPT-6 Luna costs $0.10 and $0.50. Cost per solved task is known for Gemini 3.5 Flash Lite only.

Which has the bigger context window, Gemini 3.5 Flash Lite or GPT-6 Luna?

GPT-6 Luna, with 1.05M tokens against 1.05M.

How many benchmarks is the Gemini 3.5 Flash Lite vs GPT-6 Luna comparison based on?

69 benchmarks have a result for both models as of October 21, 2026. Gemini 3.5 Flash Lite's coding index rests on 1 independent benchmark and GPT-6 Luna's on 2. Where only one model has a result, the page says so instead of naming a winner.

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