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Gemini 3.1 Flash Lite Preview vs Grok 4.3

Updated October 21, 2026. 75 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 Grok 4.3
Gemini 3.1 Flash Lite PreviewGoogle
Coding
8.1
Overall
15.6
Output $/M
$1.50
40
Grok 4.3xAI
Coding
22.5
Overall
24.9
Output $/M
$2.50
34
vs boards won of 75 shared, 1 tied

Decision reading

Pick Grok 4.3 for coding: it scores 22.5 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 $0.31.

Model AGemini 3.1 Flash Lite PreviewGoogle8.1/1001 independent benchmark$0.18 per solved taskModel BGrok 4.3xAI22.5/1001 independent benchmark$0.31 per solved task
Shared results
75
Gemini 3.1 Flash Lite Preview only
2
Grok 4.3 only
29
Like-for-like categories
8 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, Grok 4.3 22.5 from 1 benchmark.
Widest category
Web design, 12.1 points apart on average over 8 shared benchmarks.
Widest single gap
SAGE (Vals AI): Gemini 3.1 Flash Lite Preview 49.5% against Grok 4.3 19.7%, 29.8 points apart on a 0 to 100 scale.
Output price
Gemini 3.1 Flash Lite Preview $1.50 against Grok 4.3 $2.50 per million output tokens, 1.7x apart.
Context window
Gemini 3.1 Flash Lite Preview 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 3.1 Flash Lite PreviewBarsGrok 4.3Ties
Coding0131 tie
Intelligence01
Agentic work05
Reasoning52
Math20
Knowledge83
Web design17
General243
All shared boards40341 tie
CodingLike-for-likeFour of these boards feed the Vibe Coding Index013
Coding benchmarks for Gemini 3.1 Flash Lite Preview and Grok 4.3
BenchmarkGemini 3.1 Flash Lite PreviewGrok 4.3Leader
LMArena WebDev12571358Grok 4.3
AA Coding Index34.742.2Grok 4.3
LiveCodeBench (Vals AI)80.1%84.5%Grok 4.3
SWE-bench Verified (Vals AI)62.8%71.4%Grok 4.3
Vibe Code Bench (Vals AI)0.0%19.4%Grok 4.3
Code migration (Vals AI)4.6%6.8%Grok 4.3
ProgramBench (Vals AI)0.0%0.0%Tie
Terminal-Bench 2.1 (Vals AI)34.1%42.0%Grok 4.3
SkillsBench (Vals AI)Not measured40.6%Only Grok 4.3 measured
SciCodeNot measured48.3%Only Grok 4.3 measured
Terminal-Bench Hard (Artificial Analysis run)Not measured37.9%Only Grok 4.3 measured
WeirdMLNot measured49.9%Only Grok 4.3 measured
ALE-Bench797.7944.2Grok 4.3
LMArena Text: coding14001415Grok 4.3
LMArena Text: software and IT14131416Grok 4.3
LMArena WebDev: React12451353Grok 4.3
LMArena WebDev: HTML12761367Grok 4.3
LMArena WebDev: from an image13361375Grok 4.3
Neither model has a result on the other 20 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for Gemini 3.1 Flash Lite Preview and Grok 4.3
BenchmarkGemini 3.1 Flash Lite PreviewGrok 4.3Leader
AA Intelligence Index15.624.9Grok 4.3
Neither model has a result on the other 1 board here
Agentic workLike-for-likePublic boards, shown as published, kept out of the index05
Agentic work benchmarks for Gemini 3.1 Flash Lite Preview and Grok 4.3
BenchmarkGemini 3.1 Flash Lite PreviewGrok 4.3Leader
AA Agentic Index1.615.5Grok 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 measured967Only 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 measured1012Only Grok 4.3 measured
Finance Agent (Vals AI)30.0%37.7%Grok 4.3
Tax Agent Bench (Vals AI)3.1%6.2%Grok 4.3
Legal Research Bench (Vals AI)3.4%15.4%Grok 4.3
Excel Modeling Benchmark (Vals AI)8.6%18.4%Grok 4.3
τ²-Bench TelecomNot measured97.7%Only Grok 4.3 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 23 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index52
Reasoning benchmarks for Gemini 3.1 Flash Lite Preview and Grok 4.3
BenchmarkGemini 3.1 Flash Lite PreviewGrok 4.3Leader
GPQA Diamond81.1%91.4%Grok 4.3
MMMU Pro (Vals AI)82.5%83.1%Grok 4.3
GPQA Diamond (Artificial Analysis run)Not measured90.1%Only Grok 4.3 measured
Humanity's Last Exam (Artificial Analysis run)Not measured37.2%Only Grok 4.3 measured
GPQA Diamond (Epoch AI run)Not measured88.8%Only Grok 4.3 measured
Chess puzzlesNot measured18.0%Only Grok 4.3 measured
LMArena Text: hard prompts14071396Gemini 3.1 Flash Lite Preview
LMArena Text: expert13981384Gemini 3.1 Flash Lite Preview
LMArena Text: hard prompts in English14031402Gemini 3.1 Flash Lite Preview
LMArena Vision: diagrams12421241Gemini 3.1 Flash Lite Preview
LMArena Vision: homework12711241Gemini 3.1 Flash Lite Preview
Neither model has a result on the other 10 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for Gemini 3.1 Flash Lite Preview and Grok 4.3
BenchmarkGemini 3.1 Flash Lite PreviewGrok 4.3Leader
AIME83.3%Not measuredOnly Gemini 3.1 Flash Lite Preview measured
OTIS Mock AIMENot measured93.3%Only Grok 4.3 measured
FrontierMath, tiers 1 to 3Not measured42.8%Only Grok 4.3 measured
FrontierMath, tier 4Not measured14.6%Only Grok 4.3 measured
ProofBenchNot measured11.0%Only Grok 4.3 measured
LMArena Text: math14281387Gemini 3.1 Flash Lite Preview
LMArena Text: mathematical work14171396Gemini 3.1 Flash Lite Preview
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index83
Knowledge benchmarks for Gemini 3.1 Flash Lite Preview and Grok 4.3
BenchmarkGemini 3.1 Flash Lite PreviewGrok 4.3Leader
MMLU Pro86.2%85.8%Gemini 3.1 Flash Lite Preview
LegalBench (Vals AI)83.8%84.5%Grok 4.3
CaseLaw (Vals AI)55.0%79.3%Grok 4.3
CorpFin (Vals AI)59.4%68.5%Grok 4.3
TaxEval (Vals AI)71.8%70.8%Gemini 3.1 Flash Lite Preview
MortgageTax (Vals AI)68.0%48.3%Gemini 3.1 Flash Lite Preview
MedCode (Vals AI)47.6%38.1%Gemini 3.1 Flash Lite Preview
SimpleQA VerifiedNot measured33.2%Only Grok 4.3 measured
LMArena Text: science14251399Gemini 3.1 Flash Lite Preview
LMArena Text: medicine and healthcare14281384Gemini 3.1 Flash Lite Preview
LMArena Text: legal and government14181386Gemini 3.1 Flash Lite Preview
LMArena Text: business and finance13891381Gemini 3.1 Flash Lite Preview
Neither model has a result on the other 5 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 Grok 4.3
BenchmarkGemini 3.1 Flash Lite PreviewGrok 4.3Leader
Design Arena: websites10831196Grok 4.3
Design Arena: UI components10711192Grok 4.3
Design Arena: game dev10291174Grok 4.3
Design Arena: data viz10451180Grok 4.3
Design Arena: 3D10481125Grok 4.3
Design Arena: all code categories10721187Grok 4.3
Design Arena: SVG10521081Grok 4.3
Design Arena: ASCII art11661125Gemini 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 index243
General benchmarks for Gemini 3.1 Flash Lite Preview and Grok 4.3
BenchmarkGemini 3.1 Flash Lite PreviewGrok 4.3Leader
Public Benefits Bench (Vals AI)Not measured51.7%Only Grok 4.3 measured
SAGE (Vals AI)49.5%19.7%Gemini 3.1 Flash Lite Preview
MedScribe (Vals AI)63.9%74.4%Grok 4.3
Vals Multimodal Index41.4%43.3%Grok 4.3
IFBenchNot measured83.3%Only Grok 4.3 measured
Long context reasoning (AA-LCR)Not measured75.0%Only Grok 4.3 measured
DTBenchNot measured90.7%Only Grok 4.3 measured
LMCANot measured38.3%Only Grok 4.3 measured
LMArena Text14161397Gemini 3.1 Flash Lite Preview
LMArena Text: instruction following13771366Gemini 3.1 Flash Lite Preview
LMArena Text: creative writing14011380Gemini 3.1 Flash Lite Preview
LMArena Vision12401229Gemini 3.1 Flash Lite Preview
LMArena Text: English14141404Gemini 3.1 Flash Lite Preview
LMArena Text: non-English14101385Gemini 3.1 Flash Lite Preview
LMArena Text: Chinese14601422Gemini 3.1 Flash Lite Preview
LMArena Text: German14301395Gemini 3.1 Flash Lite Preview
LMArena Text: Japanese14131379Gemini 3.1 Flash Lite Preview
LMArena Text: Korean13921354Gemini 3.1 Flash Lite Preview
LMArena Text: French14241411Gemini 3.1 Flash Lite Preview
LMArena Text: Spanish14211399Gemini 3.1 Flash Lite Preview
LMArena Text: Russian14201399Gemini 3.1 Flash Lite Preview
LMArena Text: Polish14431398Gemini 3.1 Flash Lite Preview
LMArena Text: multi-turn14171406Gemini 3.1 Flash Lite Preview
LMArena Text: longer queries13941393Gemini 3.1 Flash Lite Preview
LMArena Text: writing and language14081385Gemini 3.1 Flash Lite Preview
LMArena Text: entertainment and media13861370Gemini 3.1 Flash Lite Preview
LMArena Vision: English12321235Grok 4.3
LMArena Vision: Chinese12781257Gemini 3.1 Flash Lite Preview
LMArena Vision: reading text12461235Gemini 3.1 Flash Lite Preview
LMArena Vision: humor12661222Gemini 3.1 Flash Lite Preview
LMArena Vision: captioning1259Not measuredOnly Gemini 3.1 Flash Lite Preview measured
LMArena Vision: recognizing things13081217Gemini 3.1 Flash Lite Preview
LMArena Vision: creative writing12481237Gemini 3.1 Flash Lite Preview
Neither model has a result on the other 13 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 Grok 4.3
BenchmarkGemini 3.1 Flash Lite PreviewGrok 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 3.1 Flash Lite Preview$0.0010Fits in one request
Grok 4.3$0.0025Fits 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
Grok 4.3$0.070Fits 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
Grok 4.3$0.275Fits 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 Grok 4.3
SpecificationGoogle Gemini 3.1 Flash Lite PreviewSpaceXAI Grok 4.3
MakerGooglexAI
WeightsNo public weights listedNo public weights listed
ReleasedMarch 3, 2026April 30, 2026
Context window1.05M1M
Input $/Mtok$0.25$1.25
Output $/Mtok$1.50$2.50
Coding index8.122.5
Independent measurements behind it11
Cost per solved task$0.18$0.31
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 3.1 Flash Lite Preview better than Grok 4.3 for coding?

Pick Grok 4.3 for coding: it scores 22.5 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 $0.31.

Which is cheaper, Gemini 3.1 Flash Lite Preview or Grok 4.3?

Gemini 3.1 Flash Lite Preview costs $0.25 per million input tokens and $1.50 per million output tokens; Grok 4.3 costs $1.25 and $2.50. Per solved SWE-bench Verified task, Gemini 3.1 Flash Lite Preview costs $0.18 and Grok 4.3 $0.31.

Which has the bigger context window, Gemini 3.1 Flash Lite Preview or Grok 4.3?

Gemini 3.1 Flash Lite Preview, with 1.05M tokens against 1M.

How many benchmarks is the Gemini 3.1 Flash Lite Preview vs Grok 4.3 comparison based on?

75 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 Grok 4.3's on 1. Where only one model has a result, the page says so instead of naming a winner.

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