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Gemini 3.5 Flash Lite vs Grok 4.3

Gemini 3.5 Flash Lite leads Grok 4.3 on coding, 49.0 to 37.4 on the Vibe Coding Index, at about the same output price ($2.50 vs $2.50 per million). Updated October 21, 2026; 77 benchmarks have a result for both.

Replace Gemini 3.5 Flash Lite Replace Grok 4.3
Gemini 3.5 Flash LiteGoogle
Coding
49.0
Overall
49.8
Output $/M
$2.50
55
Grok 4.3xAI
Coding
37.4
Overall
53.1
Output $/M
$2.50
20
vs boards won of 77 shared, 2 tied

Gemini 3.5 Flash Lite or Grok 4.3: which to pick

Pick Gemini 3.5 Flash Lite for coding: it scores 49.0 on the Vibe Coding Index against 37.4 for Grok 4.3.

Pick Grok 4.3 for a lower cost per solved task ($0.31 against $0.41) and work measured by LiveCodeBench (Vals AI) or Code migration (Vals AI), where it leads.

Model AGemini 3.5 Flash LiteGoogle49.0/1003 independent benchmarks$0.41 per solved taskModel BGrok 4.3xAI37.4/1003 independent benchmarks$0.31 per solved task
Shared results
77
Gemini 3.5 Flash Lite only
8
Grok 4.3 only
27
Like-for-like categories
7 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, Grok 4.3 37.4 from 3 benchmarks.
Widest category
Math, 11.6 points apart on average over 6 shared benchmarks.
Widest single gap
SAGE (Vals AI): Gemini 3.5 Flash Lite 47.3% against Grok 4.3 19.7%, 27.6 points apart on a 0 to 100 scale.
Output price
Both cost $2.50 per million output tokens.
Context window
Gemini 3.5 Flash Lite takes 1.05M tokens, Grok 4.3 1M.

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 LiteBarsGrok 4.3Ties
Coding951 tie
Intelligence01
Agentic work32
Reasoning74
Math33
Knowledge721 tie
General263
All shared boards55202 ties
CodingLike-for-likeSix of these boards feed the Vibe Coding Index95
Coding benchmarks for Gemini 3.5 Flash Lite and Grok 4.3
BenchmarkGemini 3.5 Flash LiteGrok 4.3Leader
LMArena WebDev14351358Gemini 3.5 Flash Lite
AA Coding Index49.342.2Gemini 3.5 Flash Lite
LiveCodeBench (Vals AI)79.0%84.5%Grok 4.3
SWE-bench Verified (Vals AI)75.0%71.4%Gemini 3.5 Flash Lite
Vibe Code Bench (Vals AI)37.2%19.4%Gemini 3.5 Flash Lite
Code migration (Vals AI)6.2%6.8%Grok 4.3
ProgramBench (Vals AI)0.0%0.0%Tie
Terminal-Bench 2.1 (Vals AI)50.2%42.0%Gemini 3.5 Flash Lite
SkillsBench (Vals AI)Not measured40.6%Only Grok 4.3 measured
CyberBench (Vals AI)59.1%Not measuredOnly Gemini 3.5 Flash Lite measured
SciCode41.3%48.3%Grok 4.3
Terminal-Bench Hard (Artificial Analysis run)Not measured37.9%Only Grok 4.3 measured
WeirdML39.0%49.9%Grok 4.3
ALE-Bench765.3944.2Grok 4.3
LMArena Text: coding14531415Gemini 3.5 Flash Lite
LMArena Text: software and IT14511416Gemini 3.5 Flash Lite
LMArena WebDev: React14081353Gemini 3.5 Flash Lite
LMArena WebDev: HTMLNot measured1367Only Grok 4.3 measured
LMArena WebDev: from an image14481375Gemini 3.5 Flash Lite
SciCode6.2%Not measuredOnly Gemini 3.5 Flash Lite measured
Neither model has a result on the other 19 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for Gemini 3.5 Flash Lite and Grok 4.3
BenchmarkGemini 3.5 Flash LiteGrok 4.3Leader
AA Intelligence Index22.224.9Grok 4.3
Epoch Capabilities Index144.9Not measuredOnly Gemini 3.5 Flash Lite measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index32
Agentic work benchmarks for Gemini 3.5 Flash Lite and Grok 4.3
BenchmarkGemini 3.5 Flash LiteGrok 4.3Leader
AA Agentic Index14.315.5Grok 4.3
Design Arena: agents building web appsNot measured1126Only Grok 4.3 measured
Design Arena: agents building full-stack appsNot measured1006Only Grok 4.3 measured
Design Arena: agents building mobile appsNot measured1059Only Grok 4.3 measured
Design Arena: agents building Android appsNot measured961Only Grok 4.3 measured
Design Arena: agents building Godot gamesNot measured914Only Grok 4.3 measured
Design Arena: agents building gamesNot measured1007Only Grok 4.3 measured
Design Arena: HTML slidesNot measured1008Only Grok 4.3 measured
Design Arena: PowerPoint slidesNot measured1013Only Grok 4.3 measured
Finance Agent (Vals AI)47.4%37.7%Gemini 3.5 Flash Lite
Tax Agent Bench (Vals AI)7.2%6.2%Gemini 3.5 Flash Lite
Legal Research Bench (Vals AI)13.9%15.4%Grok 4.3
Excel Modeling Benchmark (Vals AI)43.2%18.4%Gemini 3.5 Flash Lite
τ²-Bench TelecomNot measured97.7%Only Grok 4.3 measured
APEX-Agents29.3%Not measuredOnly Gemini 3.5 Flash Lite measured
Vending-Bench 2Not measured$35Only Grok 4.3 measured
LMArena SearchNot measured1166Only Grok 4.3 measured
Neither model has a result on the other 24 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index74
Reasoning benchmarks for Gemini 3.5 Flash Lite and Grok 4.3
BenchmarkGemini 3.5 Flash LiteGrok 4.3Leader
GPQA Diamond83.8%91.4%Grok 4.3
MMMU Pro (Vals AI)83.6%83.1%Gemini 3.5 Flash Lite
GPQA Diamond (Artificial Analysis run)83.8%90.1%Grok 4.3
Humanity's Last Exam (Artificial Analysis run)18.8%37.2%Grok 4.3
GPQA Diamond (Epoch AI run)83.3%88.8%Grok 4.3
ARC-AGI53.5%Not measuredOnly Gemini 3.5 Flash Lite measured
ARC-AGI-210.3%Not measuredOnly Gemini 3.5 Flash Lite measured
Chess puzzles21.0%18.0%Gemini 3.5 Flash Lite
Mystery game puzzles19.0%Not measuredOnly Gemini 3.5 Flash Lite measured
LMArena Text: hard prompts14411396Gemini 3.5 Flash Lite
LMArena Text: expert14341384Gemini 3.5 Flash Lite
LMArena Text: hard prompts in English14401402Gemini 3.5 Flash Lite
LMArena Vision: diagrams12841241Gemini 3.5 Flash Lite
LMArena Vision: homework12911241Gemini 3.5 Flash Lite
Neither model has a result on the other 8 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index33
Math benchmarks for Gemini 3.5 Flash Lite and Grok 4.3
BenchmarkGemini 3.5 Flash LiteGrok 4.3Leader
OTIS Mock AIME71.1%93.3%Grok 4.3
FrontierMath, tiers 1 to 326.0%42.8%Grok 4.3
FrontierMath, tier 40.0%14.6%Grok 4.3
ProofBench13.0%11.0%Gemini 3.5 Flash Lite
LMArena Text: math14341387Gemini 3.5 Flash Lite
LMArena Text: mathematical work14331396Gemini 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 index72
Knowledge benchmarks for Gemini 3.5 Flash Lite and Grok 4.3
BenchmarkGemini 3.5 Flash LiteGrok 4.3Leader
MMLU Pro85.8%85.8%Tie
LegalBench (Vals AI)84.1%84.5%Grok 4.3
CaseLaw (Vals AI)Not measured79.3%Only Grok 4.3 measured
CorpFin (Vals AI)60.7%68.5%Grok 4.3
TaxEval (Vals AI)72.6%70.8%Gemini 3.5 Flash Lite
MortgageTax (Vals AI)68.7%48.3%Gemini 3.5 Flash Lite
MedCode (Vals AI)43.5%38.1%Gemini 3.5 Flash Lite
SimpleQA VerifiedNot measured33.2%Only Grok 4.3 measured
LMArena Text: science14511399Gemini 3.5 Flash Lite
LMArena Text: medicine and healthcare14381384Gemini 3.5 Flash Lite
LMArena Text: legal and government14311386Gemini 3.5 Flash Lite
LMArena Text: business and finance14231381Gemini 3.5 Flash Lite
FACTS Benchmark Suite53.5%Not measuredOnly Gemini 3.5 Flash Lite measured
Neither model has a result on the other 5 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 Grok 4.3
BenchmarkGemini 3.5 Flash LiteGrok 4.3Leader
Design Arena: websitesNot measured1196Only Grok 4.3 measured
Design Arena: UI componentsNot measured1192Only Grok 4.3 measured
Design Arena: game devNot measured1174Only Grok 4.3 measured
Design Arena: data vizNot measured1179Only Grok 4.3 measured
Design Arena: 3DNot measured1125Only Grok 4.3 measured
Design Arena: all code categoriesNot measured1187Only Grok 4.3 measured
Design Arena: SVGNot measured1081Only Grok 4.3 measured
Design Arena: ASCII artNot measured1125Only Grok 4.3 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index263
General benchmarks for Gemini 3.5 Flash Lite and Grok 4.3
BenchmarkGemini 3.5 Flash LiteGrok 4.3Leader
Public Benefits Bench (Vals AI)51.8%51.7%Gemini 3.5 Flash Lite
SAGE (Vals AI)47.3%19.7%Gemini 3.5 Flash Lite
MedScribe (Vals AI)70.9%74.4%Grok 4.3
Vals Multimodal IndexNot measured43.3%Only Grok 4.3 measured
IFBenchNot measured83.3%Only Grok 4.3 measured
Long context reasoning (AA-LCR)76.0%75.0%Gemini 3.5 Flash Lite
DTBench83.5%90.7%Grok 4.3
LMCA37.6%38.3%Grok 4.3
LMArena Text14351397Gemini 3.5 Flash Lite
LMArena Text: instruction following14191366Gemini 3.5 Flash Lite
LMArena Text: creative writing14211380Gemini 3.5 Flash Lite
LMArena Vision12691229Gemini 3.5 Flash Lite
LMArena Text: English14381404Gemini 3.5 Flash Lite
LMArena Text: non-English14271385Gemini 3.5 Flash Lite
LMArena Text: Chinese14681422Gemini 3.5 Flash Lite
LMArena Text: German14541395Gemini 3.5 Flash Lite
LMArena Text: Japanese14261379Gemini 3.5 Flash Lite
LMArena Text: Korean14071354Gemini 3.5 Flash Lite
LMArena Text: French14511411Gemini 3.5 Flash Lite
LMArena Text: Spanish14411399Gemini 3.5 Flash Lite
LMArena Text: Russian14431399Gemini 3.5 Flash Lite
LMArena Text: Polish14371398Gemini 3.5 Flash Lite
LMArena Text: multi-turn14451406Gemini 3.5 Flash Lite
LMArena Text: longer queries14351393Gemini 3.5 Flash Lite
LMArena Text: writing and language14281385Gemini 3.5 Flash Lite
LMArena Text: entertainment and media14141370Gemini 3.5 Flash Lite
LMArena Vision: English12691235Gemini 3.5 Flash Lite
LMArena Vision: Chinese13111257Gemini 3.5 Flash Lite
LMArena Vision: reading text12801235Gemini 3.5 Flash Lite
LMArena Vision: humor12871222Gemini 3.5 Flash Lite
LMArena Vision: recognizing thingsNot measured1217Only Grok 4.3 measured
LMArena Vision: creative writing12601237Gemini 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 Grok 4.3
BenchmarkGemini 3.5 Flash LiteGrok 4.3Leader
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
Grok 4.3$0.0025Fits 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
Grok 4.3$0.070Fits 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
Grok 4.3$0.275Fits 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 Grok 4.3
SpecificationGoogle Gemini 3.5 Flash LiteSpaceXAI Grok 4.3
MakerGooglexAI
WeightsNo public weights listedNo public weights listed
ReleasedJuly 21, 2026April 30, 2026
Context window1.05M1M
Input $/Mtok$0.30$1.25
Output $/Mtok$2.50$2.50
Coding index49.037.4
Independent measurements behind it33
Cost per solved task$0.41$0.31
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 3.5 Flash Lite better than Grok 4.3 for coding?

Pick Gemini 3.5 Flash Lite for coding: it scores 49.0 on the Vibe Coding Index against 37.4 for Grok 4.3. Pick Grok 4.3 for a lower cost per solved task ($0.31 against $0.41) and work measured by LiveCodeBench (Vals AI) or Code migration (Vals AI), where it leads.

Which is cheaper, Gemini 3.5 Flash Lite or Grok 4.3?

Gemini 3.5 Flash Lite costs $0.30 per million input tokens and $2.50 per million output tokens; Grok 4.3 costs $1.25 and $2.50. Per solved SWE-bench Verified task, Gemini 3.5 Flash Lite costs $0.41 and Grok 4.3 $0.31.

Which has the bigger context window, Gemini 3.5 Flash Lite or Grok 4.3?

Gemini 3.5 Flash Lite, with 1.05M tokens against 1M.

How many benchmarks is the Gemini 3.5 Flash Lite vs Grok 4.3 comparison based on?

77 benchmarks have a result for both models as of October 21, 2026. Gemini 3.5 Flash Lite's coding index rests on 3 independent benchmarks and Grok 4.3'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-grok-4-3">LLMBenchmark.ai, Gemini 3.5 Flash Lite vs Grok 4.3</a></p>