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Claude Opus 4.5 vs Gemini 3.5 Flash Lite

Gemini 3.5 Flash Lite leads Claude Opus 4.5 on coding, 49.0 to 44.0 on the Vibe Coding Index, and Gemini 3.5 Flash Lite costs 10.0x less per output token ($2.50 vs $25.00 per million). Updated October 21, 2026; 61 benchmarks have a result for both.

Replace Claude Opus 4.5 Replace Gemini 3.5 Flash Lite
Claude Opus 4.5Anthropic
Coding
44.0
Overall
55.7
Output $/M
$25.00
54
Gemini 3.5 Flash LiteGoogle
Coding
49.0
Overall
49.8
Output $/M
$2.50
6
vs boards won of 61 shared, 1 tied

Claude Opus 4.5 or Gemini 3.5 Flash Lite: which to pick

Pick Gemini 3.5 Flash Lite for coding: it scores 49.0 on the Vibe Coding Index against 44.0 for Claude Opus 4.5.

Pick Claude Opus 4.5 for work measured by LMArena WebDev or LiveCodeBench (Vals AI), where it leads.

Model AClaude Opus 4.5Anthropic44.0/1003 independent benchmarks$1.37 per solved taskModel BGemini 3.5 Flash LiteGoogle49.0/1003 independent benchmarks$0.41 per solved task
Shared results
61
Claude Opus 4.5 only
47
Gemini 3.5 Flash Lite only
24
Like-for-like categories
6 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
Claude Opus 4.5 44.0 from 3 benchmarks, Gemini 3.5 Flash Lite 49.0 from 3 benchmarks.
Widest category
Math, 10.3 points apart on average over 6 shared benchmarks.
Widest single gap
ARC-AGI-2: Claude Opus 4.5 37.6% against Gemini 3.5 Flash Lite 10.3%, 27.4 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.5 $25.00 against Gemini 3.5 Flash Lite $2.50 per million output tokens, 10.0x apart.
Context window
Claude Opus 4.5 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 4.5BarsGemini 3.5 Flash LiteTies
Coding71
Intelligence20
Reasoning102
Math60
Knowledge911 tie
General202
All shared boards5461 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index71
Coding benchmarks for Claude Opus 4.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 4.5Gemini 3.5 Flash LiteLeader
SWE-bench Verified79.2%Not measuredOnly Claude Opus 4.5 measured
SWE-bench (full test set)52.6%Not measuredOnly Claude Opus 4.5 measured
SWE-bench Multilingual70.7%Not measuredOnly Claude Opus 4.5 measured
LMArena WebDev14941435Claude Opus 4.5
AA Coding IndexNot measured49.3Only Gemini 3.5 Flash Lite measured
LiveCodeBench (Vals AI)83.7%79.0%Claude Opus 4.5
SWE-bench Verified (Vals AI)76.4%75.0%Claude Opus 4.5
Vibe Code Bench (Vals AI)20.6%37.2%Gemini 3.5 Flash Lite
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
LiveCodeBench (Artificial Analysis run)87.1%Not measuredOnly Claude Opus 4.5 measured
SciCodeNot measured41.3%Only Gemini 3.5 Flash Lite measured
Terminal-Bench Hard (Artificial Analysis run)47.0%Not measuredOnly Claude Opus 4.5 measured
Terminal-Bench63.1%Not measuredOnly Claude Opus 4.5 measured
GSO-Bench26.5%Not measuredOnly Claude Opus 4.5 measured
WeirdML63.7%39.0%Claude Opus 4.5
Cybench82.0%Not measuredOnly Claude Opus 4.5 measured
ALE-BenchNot measured765.3Only Gemini 3.5 Flash Lite measured
LMArena Text: coding15031453Claude Opus 4.5
LMArena Text: software and IT14831451Claude Opus 4.5
LMArena WebDev: React14781408Claude Opus 4.5
LMArena WebDev: HTML1510Not measuredOnly Claude Opus 4.5 measured
LMArena WebDev: from an imageNot measured1448Only Gemini 3.5 Flash Lite measured
SciCodeNot measured6.2%Only Gemini 3.5 Flash Lite measured
Neither model has a result on the other 13 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 4.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 4.5Gemini 3.5 Flash LiteLeader
AA Intelligence Index29.122.2Claude Opus 4.5
Epoch Capabilities Index150.1144.9Claude Opus 4.5
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index19 boards, none shared
Agentic work benchmarks for Claude Opus 4.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 4.5Gemini 3.5 Flash LiteLeader
AA Agentic IndexNot measured14.3Only Gemini 3.5 Flash Lite measured
Design Arena: agents building web apps1159Not measuredOnly Claude Opus 4.5 measured
Design Arena: agents building full-stack apps1156Not measuredOnly Claude Opus 4.5 measured
Design Arena: agents building mobile apps1189Not measuredOnly Claude Opus 4.5 measured
Design Arena: agents building Android apps1175Not measuredOnly Claude Opus 4.5 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
τ²-Bench Telecom89.5%Not measuredOnly Claude Opus 4.5 measured
APEX-AgentsNot measured29.3%Only Gemini 3.5 Flash Lite measured
METR time horizons75.0%Not measuredOnly Claude Opus 4.5 measured
Remote Labor Index3.8%Not measuredOnly Claude Opus 4.5 measured
GDPval45.5%Not measuredOnly Claude Opus 4.5 measured
BALROG43.5%Not measuredOnly Claude Opus 4.5 measured
DeepResearch Bench54.8%Not measuredOnly Claude Opus 4.5 measured
OSWorld66.3%Not measuredOnly Claude Opus 4.5 measured
Vending-Bench 2$4,967Not measuredOnly Claude Opus 4.5 measured
Berkeley Function Calling Leaderboard (BFCL)77.5%Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 22 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index102
Reasoning benchmarks for Claude Opus 4.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 4.5Gemini 3.5 Flash LiteLeader
GPQA Diamond85.9%83.8%Claude Opus 4.5
MMMU Pro (Vals AI)83.0%83.6%Gemini 3.5 Flash Lite
GPQA Diamond (Artificial Analysis run)86.6%83.8%Claude Opus 4.5
Humanity's Last Exam (Artificial Analysis run)30.1%18.8%Claude Opus 4.5
GPQA Diamond (Epoch AI run)86.0%83.3%Claude Opus 4.5
ARC-AGI80.0%53.5%Claude Opus 4.5
ARC-AGI-237.6%10.3%Claude Opus 4.5
SimpleBench62.0%Not measuredOnly Claude Opus 4.5 measured
Chess puzzles14.0%21.0%Gemini 3.5 Flash Lite
Mystery game puzzles22.0%19.0%Claude Opus 4.5
EBR-bench14.3%Not measuredOnly Claude Opus 4.5 measured
VPCT40.0%Not measuredOnly Claude Opus 4.5 measured
LMArena Text: hard prompts14761441Claude Opus 4.5
LMArena Text: expert14871434Claude Opus 4.5
LMArena Text: hard prompts in English14821440Claude Opus 4.5
LMArena Vision: diagramsNot measured1284Only Gemini 3.5 Flash Lite measured
LMArena Vision: homeworkNot measured1291Only Gemini 3.5 Flash Lite measured
Kagi LLM Benchmark80.2%Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Opus 4.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 4.5Gemini 3.5 Flash LiteLeader
AIME95.4%Not measuredOnly Claude Opus 4.5 measured
MGSM (Vals AI)95.2%Not measuredOnly Claude Opus 4.5 measured
AA Math Index91.3Not measuredOnly Claude Opus 4.5 measured
AIME 2025 (Artificial Analysis run)91.3%Not measuredOnly Claude Opus 4.5 measured
OTIS Mock AIME86.1%71.1%Claude Opus 4.5
FrontierMath, tiers 1 to 334.4%26.0%Claude Opus 4.5
FrontierMath, tier 44.9%0.0%Claude Opus 4.5
ProofBench36.0%13.0%Claude Opus 4.5
LMArena Text: math14631434Claude Opus 4.5
LMArena Text: mathematical work14681433Claude Opus 4.5
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index91
Knowledge benchmarks for Claude Opus 4.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 4.5Gemini 3.5 Flash LiteLeader
MMLU Pro87.3%85.8%Claude Opus 4.5
LegalBench (Vals AI)84.6%84.1%Claude Opus 4.5
CaseLaw (Vals AI)62.6%Not measuredOnly Claude Opus 4.5 measured
CorpFin (Vals AI)65.1%60.7%Claude Opus 4.5
TaxEval (Vals AI)74.9%72.6%Claude Opus 4.5
MortgageTax (Vals AI)68.7%68.7%Tie
MedQA (Vals AI)95.9%Not measuredOnly Claude Opus 4.5 measured
MedCode (Vals AI)49.2%43.5%Claude Opus 4.5
MMLU Pro (Artificial Analysis run)89.5%Not measuredOnly Claude Opus 4.5 measured
SimpleQA Verified45.7%Not measuredOnly Claude Opus 4.5 measured
GeoBench75.0%Not measuredOnly Claude Opus 4.5 measured
LMArena Text: science14541451Claude Opus 4.5
LMArena Text: medicine and healthcare14441438Claude Opus 4.5
LMArena Text: legal and government14591431Claude Opus 4.5
LMArena Text: business and finance14481423Claude Opus 4.5
FACTS Benchmark Suite43.9%53.5%Gemini 3.5 Flash Lite
Neither model has a result on the other 2 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
Web design benchmarks for Claude Opus 4.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 4.5Gemini 3.5 Flash LiteLeader
Design Arena: websites1247Not measuredOnly Claude Opus 4.5 measured
Design Arena: UI components1238Not measuredOnly Claude Opus 4.5 measured
Design Arena: game dev1229Not measuredOnly Claude Opus 4.5 measured
Design Arena: data viz1243Not measuredOnly Claude Opus 4.5 measured
Design Arena: 3D1214Not measuredOnly Claude Opus 4.5 measured
Design Arena: all code categories1242Not measuredOnly Claude Opus 4.5 measured
Design Arena: SVG1181Not measuredOnly Claude Opus 4.5 measured
Design Arena: ASCII art1190Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index202
General benchmarks for Claude Opus 4.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 4.5Gemini 3.5 Flash LiteLeader
Public Benefits Bench (Vals AI)Not measured51.8%Only Gemini 3.5 Flash Lite measured
SAGE (Vals AI)52.1%47.3%Claude Opus 4.5
MedScribe (Vals AI)85.3%70.9%Claude Opus 4.5
IFBench58.0%Not measuredOnly Claude Opus 4.5 measured
Long context reasoning (AA-LCR)77.3%76.0%Claude Opus 4.5
DTBench89.9%83.5%Claude Opus 4.5
LMCA44.5%37.6%Claude Opus 4.5
CL-bench21.1%Not measuredOnly Claude Opus 4.5 measured
Furniture assembly28.3%Not measuredOnly Claude Opus 4.5 measured
LMArena Text14511435Claude Opus 4.5
LMArena Text: instruction following14781419Claude Opus 4.5
LMArena Text: creative writing14451421Claude Opus 4.5
LMArena VisionNot measured1269Only Gemini 3.5 Flash Lite measured
LMArena Text: English14611438Claude Opus 4.5
LMArena Text: non-English14381427Claude Opus 4.5
LMArena Text: Chinese14701468Claude Opus 4.5
LMArena Text: German14491454Gemini 3.5 Flash Lite
LMArena Text: Japanese14171426Gemini 3.5 Flash Lite
LMArena Text: Korean14241407Claude Opus 4.5
LMArena Text: French14711451Claude Opus 4.5
LMArena Text: Spanish14571441Claude Opus 4.5
LMArena Text: Russian14471443Claude Opus 4.5
LMArena Text: Polish14391437Claude Opus 4.5
LMArena Text: multi-turn14661445Claude Opus 4.5
LMArena Text: longer queries14791435Claude Opus 4.5
LMArena Text: writing and language14521428Claude Opus 4.5
LMArena Text: entertainment and media14341414Claude Opus 4.5
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
LMArena Document1462Not measuredOnly Claude Opus 4.5 measured
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 Claude Opus 4.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 4.5Gemini 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 4.5$0.018Fits 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 4.5$0.325Fits 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 4.5$1.25Exceeds 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 4.5 and Gemini 3.5 Flash Lite
SpecificationAnthropic Claude Opus 4.5Google Gemini 3.5 Flash Lite
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedNovember 24, 2025July 21, 2026
Context window200K1.05M
Input $/Mtok$5.00$0.30
Output $/Mtok$25.00$2.50
Coding index44.049.0
Independent measurements behind it33
Cost per solved task$1.37$0.41
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.5 better than Gemini 3.5 Flash Lite for coding?

Pick Gemini 3.5 Flash Lite for coding: it scores 49.0 on the Vibe Coding Index against 44.0 for Claude Opus 4.5. Pick Claude Opus 4.5 for work measured by LMArena WebDev or LiveCodeBench (Vals AI), where it leads.

Which is cheaper, Claude Opus 4.5 or Gemini 3.5 Flash Lite?

Claude Opus 4.5 costs $5.00 per million input tokens and $25.00 per million output tokens; Gemini 3.5 Flash Lite costs $0.30 and $2.50. Per solved SWE-bench Verified task, Claude Opus 4.5 costs $1.37 and Gemini 3.5 Flash Lite $0.41.

Which has the bigger context window, Claude Opus 4.5 or Gemini 3.5 Flash Lite?

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

How many benchmarks is the Claude Opus 4.5 vs Gemini 3.5 Flash Lite comparison based on?

61 benchmarks have a result for both models as of October 21, 2026. Claude Opus 4.5's coding index rests on 3 independent benchmarks and Gemini 3.5 Flash Lite's on 3. Where only one model has a result, the page says so instead of naming a winner.

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