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Claude Opus 4.1 vs Gemini 3.5 Flash Lite

Updated October 21, 2026. 49 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Opus 4.1 Replace Gemini 3.5 Flash Lite
Claude Opus 4.1Anthropic
Coding
27.2
Overall
22.8
Output $/M
$75.00
17
Gemini 3.5 Flash LiteGoogle
Coding
33.6
Overall
22.2
Output $/M
$2.50
32
vs boards won of 49 shared

Decision reading

Pick Gemini 3.5 Flash Lite for coding: it scores 33.6 on the Vibe Coding Index against 27.2 for Claude Opus 4.1.

Pick Claude Opus 4.1 when what matters is WeirdML or LMArena Text: coding, where it leads.

Model AClaude Opus 4.1Anthropic27.2/1001 independent benchmarkNo cost per solved taskModel BGemini 3.5 Flash LiteGoogle33.6/1001 independent benchmark$0.41 per solved task
Shared results
49
Claude Opus 4.1 only
22
Gemini 3.5 Flash Lite only
34
Like-for-like categories
6 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 Opus 4.1 27.2 from 1 benchmark, Gemini 3.5 Flash Lite 33.6 from 1 benchmark.
Widest category
Coding, 6.2 points apart on average over 5 shared benchmarks.
Widest single gap
SAGE (Vals AI): Claude Opus 4.1 31.4% against Gemini 3.5 Flash Lite 47.3%, 15.9 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.1 $75.00 against Gemini 3.5 Flash Lite $2.50 per million output tokens, 30.0x apart.
Context window
Claude Opus 4.1 takes 200K tokens, Gemini 3.5 Flash Lite 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 Opus 4.1BarsGemini 3.5 Flash LiteTies
Coding32
Intelligence11
Reasoning43
Math23
Knowledge36
General417
All shared boards1732
CodingLike-for-likeFour of these boards feed the Vibe Coding Index32
Coding benchmarks for Claude Opus 4.1 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 4.1Gemini 3.5 Flash LiteLeader
LMArena WebDev13901435Gemini 3.5 Flash Lite
AA Coding IndexNot measured49.3Only Gemini 3.5 Flash Lite measured
LiveCodeBench (Vals AI)66.5%79.0%Gemini 3.5 Flash Lite
SWE-bench Verified (Vals AI)Not measured75.0%Only Gemini 3.5 Flash Lite measured
Vibe Code Bench (Vals AI)Not measured37.2%Only Gemini 3.5 Flash Lite measured
Code migration (Vals AI)Not measured6.2%Only Gemini 3.5 Flash Lite measured
ProgramBench (Vals AI)Not measured0.0%Only Gemini 3.5 Flash Lite measured
Terminal-Bench 2.1 (Vals AI)Not measured50.2%Only Gemini 3.5 Flash Lite measured
CyberBench (Vals AI)Not measured59.1%Only Gemini 3.5 Flash Lite measured
SciCodeNot measured41.3%Only Gemini 3.5 Flash Lite measured
Terminal-Bench38.0%Not measuredOnly Claude Opus 4.1 measured
WeirdML45.9%39.0%Claude Opus 4.1
Cybench42.0%Not measuredOnly Claude Opus 4.1 measured
ALE-BenchNot measured765.3Only Gemini 3.5 Flash Lite measured
LMArena Text: coding14791453Claude Opus 4.1
LMArena Text: software and IT14561451Claude Opus 4.1
LMArena WebDev: ReactNot measured1408Only Gemini 3.5 Flash Lite measured
LMArena WebDev: HTML1399Not measuredOnly Claude Opus 4.1 measured
LMArena WebDev: from an imageNot measured1448Only 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 index11
Intelligence benchmarks for Claude Opus 4.1 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 4.1Gemini 3.5 Flash LiteLeader
AA Intelligence Index22.822.2Claude Opus 4.1
Epoch Capabilities Index144.1144.9Gemini 3.5 Flash Lite
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index9 boards, none shared
Agentic work benchmarks for Claude Opus 4.1 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 4.1Gemini 3.5 Flash LiteLeader
AA Agentic IndexNot measured14.3Only Gemini 3.5 Flash Lite measured
Finance Agent (Vals AI)Not measured47.4%Only Gemini 3.5 Flash Lite measured
Tax Agent Bench (Vals AI)Not measured7.2%Only Gemini 3.5 Flash Lite measured
Legal Research Bench (Vals AI)Not measured13.9%Only Gemini 3.5 Flash Lite measured
Excel Modeling Benchmark (Vals AI)Not measured43.2%Only Gemini 3.5 Flash Lite measured
APEX-AgentsNot measured29.3%Only Gemini 3.5 Flash Lite measured
METR time horizons66.8%Not measuredOnly Claude Opus 4.1 measured
GDPval43.6%Not measuredOnly Claude Opus 4.1 measured
DeepResearch Bench48.3%Not measuredOnly Claude Opus 4.1 measured
Neither model has a result on the other 30 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index43
Reasoning benchmarks for Claude Opus 4.1 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 4.1Gemini 3.5 Flash LiteLeader
GPQA Diamond76.3%83.8%Gemini 3.5 Flash Lite
MMMU Pro (Vals AI)77.5%83.6%Gemini 3.5 Flash Lite
GPQA Diamond (Artificial Analysis run)Not measured83.8%Only Gemini 3.5 Flash Lite measured
Humanity's Last Exam (Artificial Analysis run)Not measured18.8%Only Gemini 3.5 Flash Lite measured
GPQA Diamond (Epoch AI run)77.3%83.3%Gemini 3.5 Flash Lite
ARC-AGINot measured53.5%Only Gemini 3.5 Flash Lite measured
ARC-AGI-2Not measured10.3%Only Gemini 3.5 Flash Lite measured
SimpleBench60.0%Not measuredOnly Claude Opus 4.1 measured
Chess puzzlesNot measured21.0%Only Gemini 3.5 Flash Lite measured
Mystery game puzzles21.0%19.0%Claude Opus 4.1
EBR-bench7.9%Not measuredOnly Claude Opus 4.1 measured
VPCT35.0%Not measuredOnly Claude Opus 4.1 measured
LMArena Text: hard prompts14421441Claude Opus 4.1
LMArena Text: expert14381434Claude Opus 4.1
LMArena Text: hard prompts in English14511440Claude Opus 4.1
LMArena Vision: diagramsNot measured1284Only Gemini 3.5 Flash Lite measured
LMArena Vision: homeworkNot measured1291Only Gemini 3.5 Flash Lite measured
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index23
Math benchmarks for Claude Opus 4.1 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 4.1Gemini 3.5 Flash LiteLeader
AIME78.2%Not measuredOnly Claude Opus 4.1 measured
MATH 500 (Vals AI)95.4%Not measuredOnly Claude Opus 4.1 measured
MGSM (Vals AI)94.4%Not measuredOnly Claude Opus 4.1 measured
OTIS Mock AIME68.9%71.1%Gemini 3.5 Flash Lite
FrontierMath, tiers 1 to 312.6%26.0%Gemini 3.5 Flash Lite
FrontierMath, tier 42.4%0.0%Claude Opus 4.1
ProofBenchNot measured13.0%Only Gemini 3.5 Flash Lite measured
LMArena Text: math14311434Gemini 3.5 Flash Lite
LMArena Text: mathematical work14341433Claude Opus 4.1
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index36
Knowledge benchmarks for Claude Opus 4.1 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 4.1Gemini 3.5 Flash LiteLeader
MMLU Pro87.9%85.8%Claude Opus 4.1
LegalBench (Vals AI)83.5%84.1%Gemini 3.5 Flash Lite
CorpFin (Vals AI)Not measured60.7%Only Gemini 3.5 Flash Lite measured
TaxEval (Vals AI)73.7%72.6%Claude Opus 4.1
MortgageTax (Vals AI)61.1%68.7%Gemini 3.5 Flash Lite
MedQA (Vals AI)93.6%Not measuredOnly Claude Opus 4.1 measured
MedCode (Vals AI)47.2%43.5%Claude Opus 4.1
LMArena Text: science14221451Gemini 3.5 Flash Lite
LMArena Text: medicine and healthcare14161438Gemini 3.5 Flash Lite
LMArena Text: legal and government14211431Gemini 3.5 Flash Lite
LMArena Text: business and finance14061423Gemini 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 index8 boards, none shared
Web design benchmarks for Claude Opus 4.1 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 4.1Gemini 3.5 Flash LiteLeader
Design Arena: websites1177Not measuredOnly Claude Opus 4.1 measured
Design Arena: UI components1164Not measuredOnly Claude Opus 4.1 measured
Design Arena: game dev1172Not measuredOnly Claude Opus 4.1 measured
Design Arena: data viz1166Not measuredOnly Claude Opus 4.1 measured
Design Arena: 3D1153Not measuredOnly Claude Opus 4.1 measured
Design Arena: all code categories1171Not measuredOnly Claude Opus 4.1 measured
Design Arena: SVG1152Not measuredOnly Claude Opus 4.1 measured
Design Arena: ASCII art1167Not measuredOnly Claude Opus 4.1 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index417
General benchmarks for Claude Opus 4.1 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 4.1Gemini 3.5 Flash LiteLeader
Public Benefits Bench (Vals AI)Not measured51.8%Only Gemini 3.5 Flash Lite measured
SAGE (Vals AI)31.4%47.3%Gemini 3.5 Flash Lite
MedScribe (Vals AI)73.9%70.9%Claude Opus 4.1
Long context reasoning (AA-LCR)Not measured76.0%Only Gemini 3.5 Flash Lite measured
DTBench80.0%83.5%Gemini 3.5 Flash Lite
LMCA37.1%37.6%Gemini 3.5 Flash Lite
Creative writing (Lech Mazur)84.7%Not measuredOnly Claude Opus 4.1 measured
LMArena Text14191435Gemini 3.5 Flash Lite
LMArena Text: instruction following14351419Claude Opus 4.1
LMArena Text: creative writing14121421Gemini 3.5 Flash Lite
LMArena VisionNot measured1269Only Gemini 3.5 Flash Lite measured
LMArena Text: English14331438Gemini 3.5 Flash Lite
LMArena Text: non-English14051427Gemini 3.5 Flash Lite
LMArena Text: Chinese14271468Gemini 3.5 Flash Lite
LMArena Text: German14131454Gemini 3.5 Flash Lite
LMArena Text: Japanese13771426Gemini 3.5 Flash Lite
LMArena Text: Korean13811407Gemini 3.5 Flash Lite
LMArena Text: French14331451Gemini 3.5 Flash Lite
LMArena Text: Spanish14481441Claude Opus 4.1
LMArena Text: Russian14221443Gemini 3.5 Flash Lite
LMArena Text: Polish14131437Gemini 3.5 Flash Lite
LMArena Text: multi-turn14441445Gemini 3.5 Flash Lite
LMArena Text: longer queries14551435Claude Opus 4.1
LMArena Text: writing and language14181428Gemini 3.5 Flash Lite
LMArena Text: entertainment and media13981414Gemini 3.5 Flash Lite
LMArena Vision: EnglishNot measured1269Only Gemini 3.5 Flash Lite measured
LMArena Vision: ChineseNot measured1311Only Gemini 3.5 Flash Lite measured
LMArena Vision: reading textNot measured1280Only Gemini 3.5 Flash Lite measured
LMArena Vision: humorNot measured1287Only Gemini 3.5 Flash Lite measured
LMArena Vision: creative writingNot measured1260Only Gemini 3.5 Flash Lite measured
Neither model has a result on the other 16 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 4.1 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 4.1Gemini 3.5 Flash LiteLeader
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 Opus 4.1$0.052Fits in one request
Gemini 3.5 Flash Lite$0.0015Fits in one request

Gemini 3.5 Flash Lite costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.1$0.975Fits in one request
Gemini 3.5 Flash Lite$0.022Fits in one request

Gemini 3.5 Flash Lite costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.1$3.75Exceeds the context window
Gemini 3.5 Flash Lite$0.085Fits 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 Claude Opus 4.1 and Gemini 3.5 Flash Lite
SpecificationAnthropic Claude Opus 4.1Google Gemini 3.5 Flash Lite
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedAugust 5, 2025July 21, 2026
Context window200K1.05M
Input $/Mtok$15.00$0.30
Output $/Mtok$75.00$2.50
Coding index27.233.6
Independent measurements behind it11
Cost per solved taskNot computable$0.41
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.1 better than Gemini 3.5 Flash Lite for coding?

Pick Gemini 3.5 Flash Lite for coding: it scores 33.6 on the Vibe Coding Index against 27.2 for Claude Opus 4.1. Pick Claude Opus 4.1 when what matters is WeirdML or LMArena Text: coding, where it leads.

Which is cheaper, Claude Opus 4.1 or Gemini 3.5 Flash Lite?

Claude Opus 4.1 costs $15.00 per million input tokens and $75.00 per million output tokens; Gemini 3.5 Flash Lite costs $0.30 and $2.50. Cost per solved task is known for Gemini 3.5 Flash Lite only.

Which has the bigger context window, Claude Opus 4.1 or Gemini 3.5 Flash Lite?

Gemini 3.5 Flash Lite, with 1.05M tokens against 200K.

How many benchmarks is the Claude Opus 4.1 vs Gemini 3.5 Flash Lite comparison based on?

49 benchmarks have a result for both models as of October 21, 2026. Claude Opus 4.1's coding index rests on 1 independent benchmark and Gemini 3.5 Flash Lite's on 1. Where only one model has a result, the page says so instead of naming a winner.

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