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Claude Sonnet 4.5 vs Gemini 3.1 Flash Lite Preview

Updated October 21, 2026. 57 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Sonnet 4.5 Replace Gemini 3.1 Flash Lite Preview
Claude Sonnet 4.5Anthropic
Coding
59.1
Overall
20.7
Output $/M
$15.00
48
Gemini 3.1 Flash Lite PreviewGoogle
Coding
8.1
Overall
15.6
Output $/M
$1.50
9
vs boards won of 57 shared

Decision reading

Pick Claude Sonnet 4.5 for coding: it scores 59.1 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 10.0x less, or when a solved task costs $0.18 against $1.16.

Model AClaude Sonnet 4.5Anthropic59.1/1002 independent benchmarks$1.16 per solved taskModel BGemini 3.1 Flash Lite PreviewGoogle8.1/1001 independent benchmark$0.18 per solved task
Shared results
57
Claude Sonnet 4.5 only
35
Gemini 3.1 Flash Lite Preview only
20
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
Claude Sonnet 4.5 59.1 from 2 benchmarks, Gemini 3.1 Flash Lite Preview 8.1 from 1 benchmark.
Widest category
Coding, 15.8 points apart on average over 9 shared benchmarks.
Widest single gap
LMArena WebDev: React: Claude Sonnet 4.5 1386 against Gemini 3.1 Flash Lite Preview 1245, 23.5 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 4.5 $15.00 against Gemini 3.1 Flash Lite Preview $1.50 per million output tokens, 10.0x apart.
Context window
Claude Sonnet 4.5 takes 1M tokens, Gemini 3.1 Flash Lite Preview 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
CategoryClaude Sonnet 4.5BarsGemini 3.1 Flash Lite PreviewTies
Coding81
Intelligence10
Agentic work10
Reasoning41
Math30
Knowledge92
Web design80
General145
All shared boards489
CodingLike-for-likeFour of these boards feed the Vibe Coding Index81
Coding benchmarks for Claude Sonnet 4.5 and Gemini 3.1 Flash Lite Preview
BenchmarkClaude Sonnet 4.5Gemini 3.1 Flash Lite PreviewLeader
SWE-bench Verified74.8%Not measuredOnly Claude Sonnet 4.5 measured
SWE-bench Multilingual67.0%Not measuredOnly Claude Sonnet 4.5 measured
LMArena WebDev13941257Claude Sonnet 4.5
AA Coding Index52.134.7Claude Sonnet 4.5
LiveCodeBench (Vals AI)73.0%80.1%Gemini 3.1 Flash Lite Preview
SWE-bench Verified (Vals AI)70.0%62.8%Claude Sonnet 4.5
Vibe Code Bench (Vals AI)22.6%0.0%Claude Sonnet 4.5
Code migration (Vals AI)Not measured4.6%Only Gemini 3.1 Flash Lite Preview measured
ProgramBench (Vals AI)Not measured0.0%Only Gemini 3.1 Flash Lite Preview measured
Terminal-Bench 2.1 (Vals AI)Not measured34.1%Only Gemini 3.1 Flash Lite Preview measured
Terminal-Bench46.5%Not measuredOnly Claude Sonnet 4.5 measured
GSO-Bench14.7%Not measuredOnly Claude Sonnet 4.5 measured
WeirdML47.7%Not measuredOnly Claude Sonnet 4.5 measured
Cybench60.0%Not measuredOnly Claude Sonnet 4.5 measured
ALE-BenchNot measured797.7Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: coding14881400Claude Sonnet 4.5
LMArena Text: software and IT14731413Claude Sonnet 4.5
LMArena WebDev: React13861245Claude Sonnet 4.5
LMArena WebDev: HTML13991276Claude Sonnet 4.5
LMArena WebDev: from an imageNot measured1336Only Gemini 3.1 Flash Lite Preview measured
Neither model has a result on the other 18 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for Claude Sonnet 4.5 and Gemini 3.1 Flash Lite Preview
BenchmarkClaude Sonnet 4.5Gemini 3.1 Flash Lite PreviewLeader
AA Intelligence Index20.715.6Claude Sonnet 4.5
Epoch Capabilities Index146.7Not measuredOnly Claude Sonnet 4.5 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for Claude Sonnet 4.5 and Gemini 3.1 Flash Lite Preview
BenchmarkClaude Sonnet 4.5Gemini 3.1 Flash Lite PreviewLeader
AA Agentic Index15.81.6Claude Sonnet 4.5
Design Arena: agents building web apps1060Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: agents building full-stack apps1050Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: agents building mobile apps1137Not measuredOnly Claude Sonnet 4.5 measured
Finance Agent (Vals AI)Not measured30.0%Only Gemini 3.1 Flash Lite Preview measured
Tax Agent Bench (Vals AI)Not measured3.1%Only Gemini 3.1 Flash Lite Preview measured
Legal Research Bench (Vals AI)Not measured3.4%Only Gemini 3.1 Flash Lite Preview measured
Excel Modeling Benchmark (Vals AI)Not measured8.6%Only Gemini 3.1 Flash Lite Preview measured
METR time horizons67.4%Not measuredOnly Claude Sonnet 4.5 measured
Remote Labor Index2.1%Not measuredOnly Claude Sonnet 4.5 measured
GDPval42.5%Not measuredOnly Claude Sonnet 4.5 measured
DeepResearch Bench52.6%Not measuredOnly Claude Sonnet 4.5 measured
OSWorld62.9%Not measuredOnly Claude Sonnet 4.5 measured
Vending-Bench 2$3,839Not measuredOnly Claude Sonnet 4.5 measured
Neither model has a result on the other 25 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index41
Reasoning benchmarks for Claude Sonnet 4.5 and Gemini 3.1 Flash Lite Preview
BenchmarkClaude Sonnet 4.5Gemini 3.1 Flash Lite PreviewLeader
GPQA Diamond81.6%81.1%Claude Sonnet 4.5
MMMU Pro (Vals AI)79.3%82.5%Gemini 3.1 Flash Lite Preview
GPQA Diamond (Epoch AI run)82.3%Not measuredOnly Claude Sonnet 4.5 measured
ARC-AGI63.7%Not measuredOnly Claude Sonnet 4.5 measured
ARC-AGI-213.6%Not measuredOnly Claude Sonnet 4.5 measured
SimpleBench54.3%Not measuredOnly Claude Sonnet 4.5 measured
Chess puzzles10.0%Not measuredOnly Claude Sonnet 4.5 measured
Mystery game puzzles17.0%Not measuredOnly Claude Sonnet 4.5 measured
EBR-bench2.4%Not measuredOnly Claude Sonnet 4.5 measured
VPCT39.8%Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: hard prompts14621407Claude Sonnet 4.5
LMArena Text: expert14831398Claude Sonnet 4.5
LMArena Text: hard prompts in English14711403Claude Sonnet 4.5
LMArena Vision: diagramsNot measured1242Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: homeworkNot measured1271Only Gemini 3.1 Flash Lite Preview measured
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index30
Math benchmarks for Claude Sonnet 4.5 and Gemini 3.1 Flash Lite Preview
BenchmarkClaude Sonnet 4.5Gemini 3.1 Flash Lite PreviewLeader
AIME88.2%83.3%Claude Sonnet 4.5
MGSM (Vals AI)94.3%Not measuredOnly Claude Sonnet 4.5 measured
OTIS Mock AIME77.8%Not measuredOnly Claude Sonnet 4.5 measured
FrontierMath, tiers 1 to 323.9%Not measuredOnly Claude Sonnet 4.5 measured
FrontierMath, tier 42.4%Not measuredOnly Claude Sonnet 4.5 measured
ProofBench19.0%Not measuredOnly Claude Sonnet 4.5 measured
MATH level 597.7%Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: math14491428Claude Sonnet 4.5
LMArena Text: mathematical work14621417Claude Sonnet 4.5
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index92
Knowledge benchmarks for Claude Sonnet 4.5 and Gemini 3.1 Flash Lite Preview
BenchmarkClaude Sonnet 4.5Gemini 3.1 Flash Lite PreviewLeader
MMLU Pro87.4%86.2%Claude Sonnet 4.5
LegalBench (Vals AI)84.1%83.8%Claude Sonnet 4.5
CaseLaw (Vals AI)62.2%55.0%Claude Sonnet 4.5
CorpFin (Vals AI)62.0%59.4%Claude Sonnet 4.5
TaxEval (Vals AI)73.3%71.8%Claude Sonnet 4.5
MortgageTax (Vals AI)64.0%68.0%Gemini 3.1 Flash Lite Preview
MedQA (Vals AI)94.7%Not measuredOnly Claude Sonnet 4.5 measured
MedCode (Vals AI)44.1%47.6%Gemini 3.1 Flash Lite Preview
SimpleQA Verified30.7%Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: science14481425Claude Sonnet 4.5
LMArena Text: medicine and healthcare14441428Claude Sonnet 4.5
LMArena Text: legal and government14511418Claude Sonnet 4.5
LMArena Text: business and finance14401389Claude Sonnet 4.5
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Claude Sonnet 4.5 and Gemini 3.1 Flash Lite Preview
BenchmarkClaude Sonnet 4.5Gemini 3.1 Flash Lite PreviewLeader
Design Arena: websites11901083Claude Sonnet 4.5
Design Arena: UI components11731071Claude Sonnet 4.5
Design Arena: game dev11661029Claude Sonnet 4.5
Design Arena: data viz11671045Claude Sonnet 4.5
Design Arena: 3D11581048Claude Sonnet 4.5
Design Arena: all code categories11831072Claude Sonnet 4.5
Design Arena: SVG11141052Claude Sonnet 4.5
Design Arena: ASCII art12041166Claude Sonnet 4.5
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index145
General benchmarks for Claude Sonnet 4.5 and Gemini 3.1 Flash Lite Preview
BenchmarkClaude Sonnet 4.5Gemini 3.1 Flash Lite PreviewLeader
SAGE (Vals AI)36.1%49.5%Gemini 3.1 Flash Lite Preview
MedScribe (Vals AI)84.5%63.9%Claude Sonnet 4.5
Vals Multimodal IndexNot measured41.4%Only Gemini 3.1 Flash Lite Preview measured
DTBench83.2%Not measuredOnly Claude Sonnet 4.5 measured
LMCA38.8%Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text14381416Claude Sonnet 4.5
LMArena Text: instruction following14591377Claude Sonnet 4.5
LMArena Text: creative writing14421401Claude Sonnet 4.5
LMArena VisionNot measured1240Only Gemini 3.1 Flash Lite Preview measured
LMArena Text: English14501414Claude Sonnet 4.5
LMArena Text: non-English14251410Claude Sonnet 4.5
LMArena Text: Chinese14601460Gemini 3.1 Flash Lite Preview
LMArena Text: German14271430Gemini 3.1 Flash Lite Preview
LMArena Text: Japanese13901413Gemini 3.1 Flash Lite Preview
LMArena Text: Korean14021392Claude Sonnet 4.5
LMArena Text: French14591424Claude Sonnet 4.5
LMArena Text: Spanish14581421Claude Sonnet 4.5
LMArena Text: Russian14371420Claude Sonnet 4.5
LMArena Text: Polish14231443Gemini 3.1 Flash Lite Preview
LMArena Text: multi-turn14651417Claude Sonnet 4.5
LMArena Text: longer queries14751394Claude Sonnet 4.5
LMArena Text: writing and language14421408Claude Sonnet 4.5
LMArena Text: entertainment and media14281386Claude Sonnet 4.5
LMArena Vision: EnglishNot measured1232Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: ChineseNot measured1278Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: reading textNot measured1246Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: humorNot measured1266Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: captioningNot measured1259Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: recognizing thingsNot measured1308Only Gemini 3.1 Flash Lite Preview measured
LMArena Vision: creative writingNot measured1248Only Gemini 3.1 Flash Lite Preview measured
LMArena Document1450Not measuredOnly Claude Sonnet 4.5 measured
Neither model has a result on the other 15 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Sonnet 4.5 and Gemini 3.1 Flash Lite Preview
BenchmarkClaude Sonnet 4.5Gemini 3.1 Flash Lite PreviewLeader
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

Claude Sonnet 4.5$0.011Fits in one request
Gemini 3.1 Flash Lite Preview$0.0010Fits in one request

Gemini 3.1 Flash Lite Preview costs less

Repository review

50K input + 3K output tokens

Claude Sonnet 4.5$0.195Fits in one request
Gemini 3.1 Flash Lite Preview$0.017Fits in one request

Gemini 3.1 Flash Lite Preview costs less

Agent loop

200K input + 10K output tokens

Claude Sonnet 4.5$0.750Fits in one request
Gemini 3.1 Flash Lite Preview$0.065Fits 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 Claude Sonnet 4.5 and Gemini 3.1 Flash Lite Preview
SpecificationAnthropic Claude Sonnet 4.5Google Gemini 3.1 Flash Lite Preview
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 29, 2025March 3, 2026
Context window1M1.05M
Input $/Mtok$3.00$0.25
Output $/Mtok$15.00$1.50
Coding index59.18.1
Independent measurements behind it21
Cost per solved task$1.16$0.18
SourceOpenRouter listingOpenRouter listing

Questions

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

Pick Claude Sonnet 4.5 for coding: it scores 59.1 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 10.0x less, or when a solved task costs $0.18 against $1.16.

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

Claude Sonnet 4.5 costs $3.00 per million input tokens and $15.00 per million output tokens; Gemini 3.1 Flash Lite Preview costs $0.25 and $1.50. Per solved SWE-bench Verified task, Claude Sonnet 4.5 costs $1.16 and Gemini 3.1 Flash Lite Preview $0.18.

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

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

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

57 benchmarks have a result for both models as of October 21, 2026. Claude Sonnet 4.5's coding index rests on 2 independent benchmarks and Gemini 3.1 Flash Lite Preview's on 1. Where only one model has a result, the page says so instead of naming a winner.

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