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Gemini 3.1 Flash Lite Preview vs Grok 4.5

Updated October 21, 2026. 73 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 4.5
Gemini 3.1 Flash Lite PreviewGoogle
Coding
8.1
Overall
15.6
Output $/M
$1.50
6
Grok 4.5xAI
Coding
75.5
Overall
38.8
Output $/M
$6.00
66
vs boards won of 73 shared, 1 tied

Decision reading

Pick Grok 4.5 for coding: it scores 75.5 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 4.0x less, or when a solved task costs $0.18 against $0.62.

Model AGemini 3.1 Flash Lite PreviewGoogle8.1/1001 independent benchmark$0.18 per solved taskModel BGrok 4.5xAI75.5/1002 independent benchmarks$0.62 per solved task
Shared results
73
Gemini 3.1 Flash Lite Preview only
4
Grok 4.5 only
47
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 4.5 75.5 from 2 benchmarks.
Widest category
Agentic work, 31.7 points apart on average over 5 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): Gemini 3.1 Flash Lite Preview 0.0% against Grok 4.5 69.0%, 69.0 points apart on a 0 to 100 scale.
Output price
Gemini 3.1 Flash Lite Preview $1.50 against Grok 4.5 $6.00 per million output tokens, 4.0x apart.
Context window
Gemini 3.1 Flash Lite Preview takes 1.05M tokens, Grok 4.5 500K.

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 4.5Ties
Coding0131 tie
Intelligence01
Agentic work05
Reasoning16
Math02
Knowledge37
Web design08
General224
All shared boards6661 tie
CodingLike-for-likeFour of these boards feed the Vibe Coding Index013
Coding benchmarks for Gemini 3.1 Flash Lite Preview and Grok 4.5
BenchmarkGemini 3.1 Flash Lite PreviewGrok 4.5Leader
LiveBench codingNot measured94.3%Only Grok 4.5 measured
LMArena WebDev12571553Grok 4.5
AA Coding Index34.772.4Grok 4.5
LiveCodeBench (Vals AI)80.1%87.3%Grok 4.5
SWE-bench Verified (Vals AI)62.8%86.6%Grok 4.5
Terminal-Bench 4 (Vals AI)Not measured8.6%Only Grok 4.5 measured
Vibe Code Bench (Vals AI)0.0%69.0%Grok 4.5
Code migration (Vals AI)4.6%36.6%Grok 4.5
ProgramBench (Vals AI)0.0%0.0%Tie
IOI (Vals AI)Not measured40.6%Only Grok 4.5 measured
Terminal-Bench 2.1 (Vals AI)34.1%67.8%Grok 4.5
SkillsBench (Vals AI)Not measured66.0%Only Grok 4.5 measured
CyberBench (Vals AI)Not measured71.0%Only Grok 4.5 measured
SciCodeNot measured55.0%Only Grok 4.5 measured
FrontierCodeNot measured42.4%Only Grok 4.5 measured
WeirdMLNot measured46.4%Only Grok 4.5 measured
ALE-Bench797.71309.3Grok 4.5
LMArena Text: coding14001474Grok 4.5
LMArena Text: software and IT14131471Grok 4.5
LMArena WebDev: React12451556Grok 4.5
LMArena WebDev: HTML12761567Grok 4.5
LMArena WebDev: from an image13361562Grok 4.5
Neither model has a result on the other 16 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 4.5
BenchmarkGemini 3.1 Flash Lite PreviewGrok 4.5Leader
AA Intelligence Index15.638.8Grok 4.5
Epoch Capabilities IndexNot measured154.1Only Grok 4.5 measured
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 4.5
BenchmarkGemini 3.1 Flash Lite PreviewGrok 4.5Leader
AA Agentic Index1.641.2Grok 4.5
Design Arena: agents building web appsNot measured1217Only Grok 4.5 measured
Design Arena: agents building full-stack appsNot measured1249Only Grok 4.5 measured
Design Arena: agents building mobile appsNot measured1221Only Grok 4.5 measured
Design Arena: agents building Android appsNot measured1242Only Grok 4.5 measured
Design Arena: agents building Godot gamesNot measured1229Only Grok 4.5 measured
Design Arena: agents building gamesNot measured1235Only Grok 4.5 measured
Design Arena: HTML slidesNot measured1204Only Grok 4.5 measured
Design Arena: PowerPoint slidesNot measured1232Only Grok 4.5 measured
LiveBench researchNot measured85.9%Only Grok 4.5 measured
LiveBench browserNot measured44.0%Only Grok 4.5 measured
LiveBench long agenticNot measured27.9%Only Grok 4.5 measured
SREBench (Vals AI)Not measured0.8%Only Grok 4.5 measured
Finance Agent (Vals AI)30.0%48.4%Grok 4.5
Tax Agent Bench (Vals AI)3.1%24.9%Grok 4.5
Legal Research Bench (Vals AI)3.4%38.0%Grok 4.5
Excel Modeling Benchmark (Vals AI)8.6%52.9%Grok 4.5
Time Horizon Index (Vals AI)Not measured6.3%Only Grok 4.5 measured
APEX-AgentsNot measured56.2%Only Grok 4.5 measured
PostTrainBenchNot measured23.4%Only Grok 4.5 measured
Vending-Bench 2Not measured$3,887Only Grok 4.5 measured
LMArena SearchNot measured1216Only Grok 4.5 measured
Neither model has a result on the other 17 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index16
Reasoning benchmarks for Gemini 3.1 Flash Lite Preview and Grok 4.5
BenchmarkGemini 3.1 Flash Lite PreviewGrok 4.5Leader
GPQA Diamond81.1%92.9%Grok 4.5
LiveBench reasoningNot measured87.2%Only Grok 4.5 measured
MMMU Pro (Vals AI)82.5%61.8%Gemini 3.1 Flash Lite Preview
GPQA Diamond (Artificial Analysis run)Not measured93.1%Only Grok 4.5 measured
Humanity's Last Exam (Artificial Analysis run)Not measured42.7%Only Grok 4.5 measured
GPQA Diamond (Epoch AI run)Not measured93.4%Only Grok 4.5 measured
ARC-AGINot measured87.2%Only Grok 4.5 measured
ARC-AGI-2Not measured52.6%Only Grok 4.5 measured
SimpleBenchNot measured70.0%Only Grok 4.5 measured
Chess puzzlesNot measured35.0%Only Grok 4.5 measured
LMArena Text: hard prompts14071462Grok 4.5
LMArena Text: expert13981465Grok 4.5
LMArena Text: hard prompts in English14031464Grok 4.5
LMArena Vision: diagrams12421304Grok 4.5
LMArena Vision: homework12711295Grok 4.5
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index02
Math benchmarks for Gemini 3.1 Flash Lite Preview and Grok 4.5
BenchmarkGemini 3.1 Flash Lite PreviewGrok 4.5Leader
AIME83.3%Not measuredOnly Gemini 3.1 Flash Lite Preview measured
OTIS Mock AIMENot measured97.8%Only Grok 4.5 measured
FrontierMath, tiers 1 to 3Not measured57.2%Only Grok 4.5 measured
FrontierMath, tier 4Not measured24.4%Only Grok 4.5 measured
ProofBenchNot measured31.0%Only Grok 4.5 measured
LMArena Text: math14281460Grok 4.5
LMArena Text: mathematical work14171482Grok 4.5
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index37
Knowledge benchmarks for Gemini 3.1 Flash Lite Preview and Grok 4.5
BenchmarkGemini 3.1 Flash Lite PreviewGrok 4.5Leader
MMLU Pro86.2%89.2%Grok 4.5
LegalBench (Vals AI)83.8%86.0%Grok 4.5
CaseLaw (Vals AI)55.0%Not measuredOnly Gemini 3.1 Flash Lite Preview measured
CorpFin (Vals AI)59.4%67.4%Grok 4.5
TaxEval (Vals AI)71.8%71.7%Gemini 3.1 Flash Lite Preview
MortgageTax (Vals AI)68.0%61.8%Gemini 3.1 Flash Lite Preview
MedCode (Vals AI)47.6%43.3%Gemini 3.1 Flash Lite Preview
SimpleQA VerifiedNot measured48.3%Only Grok 4.5 measured
LMArena Text: science14251464Grok 4.5
LMArena Text: medicine and healthcare14281440Grok 4.5
LMArena Text: legal and government14181463Grok 4.5
LMArena Text: business and finance13891441Grok 4.5
Neither model has a result on the other 5 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index08
Web design benchmarks for Gemini 3.1 Flash Lite Preview and Grok 4.5
BenchmarkGemini 3.1 Flash Lite PreviewGrok 4.5Leader
Design Arena: websites10831281Grok 4.5
Design Arena: UI components10711279Grok 4.5
Design Arena: game dev10291263Grok 4.5
Design Arena: data viz10451267Grok 4.5
Design Arena: 3D10481257Grok 4.5
Design Arena: all code categories10721276Grok 4.5
Design Arena: SVG10521215Grok 4.5
Design Arena: ASCII art11661257Grok 4.5
LiveBench designNot measured78.1%Only Grok 4.5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index224
General benchmarks for Gemini 3.1 Flash Lite Preview and Grok 4.5
BenchmarkGemini 3.1 Flash Lite PreviewGrok 4.5Leader
LiveBench data analysisNot measured73.0%Only Grok 4.5 measured
SAGE (Vals AI)49.5%35.0%Gemini 3.1 Flash Lite Preview
MedScribe (Vals AI)63.9%86.9%Grok 4.5
Vals Multimodal Index41.4%63.4%Grok 4.5
Long context reasoning (AA-LCR)Not measured79.3%Only Grok 4.5 measured
DTBenchNot measured96.5%Only Grok 4.5 measured
LMCANot measured45.2%Only Grok 4.5 measured
Surface Evolver BenchNot measured74.4%Only Grok 4.5 measured
Furniture assemblyNot measured22.5%Only Grok 4.5 measured
LMArena Text14161448Grok 4.5
LMArena Text: instruction following13771445Grok 4.5
LMArena Text: creative writing14011442Grok 4.5
LMArena Vision12401287Grok 4.5
LMArena Text: English14141453Grok 4.5
LMArena Text: non-English14101440Grok 4.5
LMArena Text: Chinese14601495Grok 4.5
LMArena Text: German14301448Grok 4.5
LMArena Text: Japanese14131430Grok 4.5
LMArena Text: Korean13921406Grok 4.5
LMArena Text: French14241457Grok 4.5
LMArena Text: Spanish14211451Grok 4.5
LMArena Text: Russian14201449Grok 4.5
LMArena Text: Polish14431432Gemini 3.1 Flash Lite Preview
LMArena Text: multi-turn14171456Grok 4.5
LMArena Text: longer queries13941462Grok 4.5
LMArena Text: writing and language14081445Grok 4.5
LMArena Text: entertainment and media13861434Grok 4.5
LMArena Vision: English12321285Grok 4.5
LMArena Vision: Chinese12781345Grok 4.5
LMArena Vision: reading text12461293Grok 4.5
LMArena Vision: humor12661276Grok 4.5
LMArena Vision: captioning1259Not measuredOnly Gemini 3.1 Flash Lite Preview measured
LMArena Vision: recognizing things1308Not measuredOnly Gemini 3.1 Flash Lite Preview measured
LMArena Vision: creative writing12481293Grok 4.5
LMArena DocumentNot measured1452Only Grok 4.5 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 Grok 4.5
BenchmarkGemini 3.1 Flash Lite PreviewGrok 4.5Leader
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 4.5$0.0050Fits 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 4.5$0.118Fits 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 4.5$0.460Fits 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 4.5
SpecificationGoogle Gemini 3.1 Flash Lite PreviewSpaceXAI Grok 4.5
MakerGooglexAI
WeightsNo public weights listedNo public weights listed
ReleasedMarch 3, 2026July 8, 2026
Context window1.05M500K
Input $/Mtok$0.25$2.00
Output $/Mtok$1.50$6.00
Coding index8.175.5
Independent measurements behind it12
Cost per solved task$0.18$0.62
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 3.1 Flash Lite Preview better than Grok 4.5 for coding?

Pick Grok 4.5 for coding: it scores 75.5 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 4.0x less, or when a solved task costs $0.18 against $0.62.

Which is cheaper, Gemini 3.1 Flash Lite Preview or Grok 4.5?

Gemini 3.1 Flash Lite Preview costs $0.25 per million input tokens and $1.50 per million output tokens; Grok 4.5 costs $2.00 and $6.00. Per solved SWE-bench Verified task, Gemini 3.1 Flash Lite Preview costs $0.18 and Grok 4.5 $0.62.

Which has the bigger context window, Gemini 3.1 Flash Lite Preview or Grok 4.5?

Gemini 3.1 Flash Lite Preview, with 1.05M tokens against 500K.

How many benchmarks is the Gemini 3.1 Flash Lite Preview vs Grok 4.5 comparison based on?

73 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 4.5's on 2. Where only one model has a result, the page says so instead of naming a winner.

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