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Claude Opus 5.5 vs Gemini 3.5 Flash Lite

Claude Opus 5.5 leads Gemini 3.5 Flash Lite on coding, 88.8 to 49.0 on the Vibe Coding Index, and Gemini 3.5 Flash Lite costs 8.0x less per output token ($2.50 vs $20.00 per million). Updated October 22, 2026; 67 benchmarks have a result for both.

Replace Claude Opus 5.5 Replace Gemini 3.5 Flash Lite
Claude Opus 5.5Anthropic
Coding
88.8
Overall
87.1
Output $/M
$20.00
66
Gemini 3.5 Flash LiteGoogle
Coding
49.0
Overall
49.8
Output $/M
$2.50
1
vs boards won of 67 shared

Claude Opus 5.5 or Gemini 3.5 Flash Lite: which to pick

Pick Claude Opus 5.5 for coding: it scores 88.8 on the Vibe Coding Index against 49.0 for Gemini 3.5 Flash Lite.

Pick Gemini 3.5 Flash Lite for output tokens 8.0x cheaper ($2.50 vs $20.00 per million) and a larger context window (1.05M against 1M tokens).

Model AClaude Opus 5.5Anthropic88.8/1005 independent benchmarksNo cost per solved taskModel BGemini 3.5 Flash LiteGoogle49.0/1003 independent benchmarks$0.41 per solved task
Shared results
67
Claude Opus 5.5 only
42
Gemini 3.5 Flash Lite only
18
Like-for-like categories
7 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 5.5 88.8 from 5 benchmarks, Gemini 3.5 Flash Lite 49.0 from 3 benchmarks.
Widest category
Math, 50.6 points apart on average over 6 shared benchmarks.
Widest single gap
FrontierMath, tier 4: Claude Opus 5.5 95.0% against Gemini 3.5 Flash Lite 0.0%, 95.0 points apart on a 0 to 100 scale.
Output price
Claude Opus 5.5 $20.00 against Gemini 3.5 Flash Lite $2.50 per million output tokens, 8.0x apart.
Context window
Claude Opus 5.5 takes 1M 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 5.5BarsGemini 3.5 Flash LiteTies
Coding130
Intelligence20
Agentic work50
Reasoning110
Math60
Knowledge60
General231
All shared boards661
CodingLike-for-likeSix of these boards feed the Vibe Coding Index130
Coding benchmarks for Claude Opus 5.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 5.5Gemini 3.5 Flash LiteLeader
LiveBench coding96.3%Not measuredOnly Claude Opus 5.5 measured
LMArena WebDev18071435Claude Opus 5.5
AA Coding IndexNot measured49.3Only Gemini 3.5 Flash Lite measured
LiveCodeBench (Vals AI)Not measured79.0%Only Gemini 3.5 Flash Lite measured
SWE-bench Verified (Vals AI)Not measured75.0%Only Gemini 3.5 Flash Lite measured
Terminal-Bench 4 (Vals AI)65.2%Not measuredOnly Claude Opus 5.5 measured
Vibe Code Bench (Vals AI)90.3%37.2%Claude Opus 5.5
Code migration (Vals AI)66.7%6.2%Claude Opus 5.5
ProgramBench (Vals AI)18.5%0.0%Claude Opus 5.5
IOI (Vals AI)95.1%Not measuredOnly Claude Opus 5.5 measured
Terminal-Bench 2.1 (Vals AI)87.6%50.2%Claude Opus 5.5
SWE-bench Multimodal (Vals AI)70.2%Not measuredOnly Claude Opus 5.5 measured
Vibe Code Bench 1-100 (Vals AI)30.4%Not measuredOnly Claude Opus 5.5 measured
CyberBench (Vals AI)74.6%59.1%Claude Opus 5.5
SciCode66.9%41.3%Claude Opus 5.5
FrontierCode54.6%Not measuredOnly Claude Opus 5.5 measured
FrontierSWE62.3%Not measuredOnly Claude Opus 5.5 measured
WeirdMLNot measured39.0%Only Gemini 3.5 Flash Lite measured
MirrorCode77.4%Not measuredOnly Claude Opus 5.5 measured
ALE-Bench2147.4765.3Claude Opus 5.5
LMArena Text: coding15451453Claude Opus 5.5
LMArena Text: software and IT15381451Claude Opus 5.5
LMArena WebDev: React18551408Claude Opus 5.5
LMArena WebDev: HTML1753Not measuredOnly Claude Opus 5.5 measured
LMArena WebDev: from an image17531448Claude Opus 5.5
SciCode18.5%6.2%Claude Opus 5.5
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 5.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 5.5Gemini 3.5 Flash LiteLeader
AA Intelligence Index57.622.2Claude Opus 5.5
Epoch Capabilities Index168.8144.9Claude Opus 5.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index50
Agentic work benchmarks for Claude Opus 5.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 5.5Gemini 3.5 Flash LiteLeader
AA Agentic IndexNot measured14.3Only Gemini 3.5 Flash Lite measured
Design Arena: agents building web apps1316Not measuredOnly Claude Opus 5.5 measured
Design Arena: agents building mobile apps1308Not measuredOnly Claude Opus 5.5 measured
Design Arena: spreadsheets1368Not measuredOnly Claude Opus 5.5 measured
LiveBench research85.0%Not measuredOnly Claude Opus 5.5 measured
LiveBench browser80.0%Not measuredOnly Claude Opus 5.5 measured
LiveBench long agentic85.0%Not measuredOnly Claude Opus 5.5 measured
SREBench (Vals AI)33.6%Not measuredOnly Claude Opus 5.5 measured
Finance Agent (Vals AI)58.6%47.4%Claude Opus 5.5
Tax Agent Bench (Vals AI)45.6%7.2%Claude Opus 5.5
Legal Research Bench (Vals AI)50.5%13.9%Claude Opus 5.5
Harvey's Legal Agent Benchmark (Vals AI)9.2%Not measuredOnly Claude Opus 5.5 measured
Excel Modeling Benchmark (Vals AI)75.9%43.2%Claude Opus 5.5
BioMysteryBench (Vals AI)79.3%Not measuredOnly Claude Opus 5.5 measured
Terminal-Bench-Science (Vals AI)47.1%Not measuredOnly Claude Opus 5.5 measured
Vals Science Index58.7%Not measuredOnly Claude Opus 5.5 measured
Time Horizon Index (Vals AI)91.3%Not measuredOnly Claude Opus 5.5 measured
CUA-bench (Vals AI)14.0%Not measuredOnly Claude Opus 5.5 measured
Robo-bench (Vals AI)14.6%Not measuredOnly Claude Opus 5.5 measured
APEX-Agents73.5%29.3%Claude Opus 5.5
Remote Labor Index21.3%Not measuredOnly Claude Opus 5.5 measured
SpireClimb3.3%Not measuredOnly Claude Opus 5.5 measured
Vending-Bench 2$9,235Not measuredOnly Claude Opus 5.5 measured
LMArena Search1213Not measuredOnly Claude Opus 5.5 measured
Neither model has a result on the other 17 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index110
Reasoning benchmarks for Claude Opus 5.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 5.5Gemini 3.5 Flash LiteLeader
GPQA DiamondNot measured83.8%Only Gemini 3.5 Flash Lite measured
LiveBench reasoning92.2%Not measuredOnly Claude Opus 5.5 measured
MysteryMechanism (Vals AI)49.5%Not measuredOnly Claude Opus 5.5 measured
MMMU Pro (Vals AI)Not measured83.6%Only Gemini 3.5 Flash Lite measured
GPQA Diamond (Artificial Analysis run)Not measured83.8%Only Gemini 3.5 Flash Lite measured
Humanity's Last Exam (Artificial Analysis run)61.4%18.8%Claude Opus 5.5
GPQA Diamond (Epoch AI run)90.6%83.3%Claude Opus 5.5
ARC-AGI98.5%53.5%Claude Opus 5.5
ARC-AGI-293.3%10.3%Claude Opus 5.5
Chess puzzles67.0%21.0%Claude Opus 5.5
Mystery game puzzles71.0%19.0%Claude Opus 5.5
EBR-bench71.4%Not measuredOnly Claude Opus 5.5 measured
LMArena Text: hard prompts15361441Claude Opus 5.5
LMArena Text: expert15491434Claude Opus 5.5
LMArena Text: hard prompts in English15351440Claude Opus 5.5
LMArena Vision: diagrams13451284Claude Opus 5.5
LMArena Vision: homework13621291Claude Opus 5.5
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Opus 5.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 5.5Gemini 3.5 Flash LiteLeader
OTIS Mock AIME100.0%71.1%Claude Opus 5.5
FrontierMath, tiers 1 to 391.2%26.0%Claude Opus 5.5
FrontierMath, tier 495.0%0.0%Claude Opus 5.5
ProofBench100.0%13.0%Claude Opus 5.5
LMArena Text: math15181434Claude Opus 5.5
LMArena Text: mathematical work15161433Claude Opus 5.5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index60
Knowledge benchmarks for Claude Opus 5.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 5.5Gemini 3.5 Flash LiteLeader
MMLU ProNot measured85.8%Only Gemini 3.5 Flash Lite measured
LegalBench (Vals AI)Not measured84.1%Only Gemini 3.5 Flash Lite measured
CorpFin (Vals AI)Not measured60.7%Only Gemini 3.5 Flash Lite measured
TaxEval (Vals AI)Not measured72.6%Only Gemini 3.5 Flash Lite measured
MortgageTax (Vals AI)Not measured68.7%Only Gemini 3.5 Flash Lite measured
MedCode (Vals AI)49.8%43.5%Claude Opus 5.5
SimpleQA Verified72.2%Not measuredOnly Claude Opus 5.5 measured
LMArena Text: science15241451Claude Opus 5.5
LMArena Text: medicine and healthcare15091438Claude Opus 5.5
LMArena Text: legal and government15181431Claude Opus 5.5
LMArena Text: business and finance14941423Claude Opus 5.5
FACTS Benchmark Suite65.3%53.5%Claude Opus 5.5
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 5.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 5.5Gemini 3.5 Flash LiteLeader
Design Arena: websites1335Not measuredOnly Claude Opus 5.5 measured
Design Arena: UI components1385Not measuredOnly Claude Opus 5.5 measured
Design Arena: game dev1461Not measuredOnly Claude Opus 5.5 measured
Design Arena: data viz1397Not measuredOnly Claude Opus 5.5 measured
Design Arena: 3D1476Not measuredOnly Claude Opus 5.5 measured
Design Arena: all code categories1390Not measuredOnly Claude Opus 5.5 measured
Design Arena: SVG1329Not measuredOnly Claude Opus 5.5 measured
LiveBench design86.9%Not measuredOnly Claude Opus 5.5 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index231
General benchmarks for Claude Opus 5.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 5.5Gemini 3.5 Flash LiteLeader
Vals Index70.2%Not measuredOnly Claude Opus 5.5 measured
LiveBench data analysis80.3%Not measuredOnly Claude Opus 5.5 measured
Public Benefits Bench (Vals AI)70.6%51.8%Claude Opus 5.5
SAGE (Vals AI)45.8%47.3%Gemini 3.5 Flash Lite
MedScribe (Vals AI)91.4%70.9%Claude Opus 5.5
Long context reasoning (AA-LCR)84.7%76.0%Claude Opus 5.5
DTBench98.9%83.5%Claude Opus 5.5
LMCA68.2%37.6%Claude Opus 5.5
Furniture assembly83.3%Not measuredOnly Claude Opus 5.5 measured
LMArena Text15161435Claude Opus 5.5
LMArena Text: instruction following15371419Claude Opus 5.5
LMArena Text: creative writing15351421Claude Opus 5.5
LMArena Vision13211269Claude Opus 5.5
LMArena Text: English15191438Claude Opus 5.5
LMArena Text: non-English15071427Claude Opus 5.5
LMArena Text: Chinese15821468Claude Opus 5.5
LMArena Text: GermanNot measured1454Only Gemini 3.5 Flash Lite measured
LMArena Text: Japanese15341426Claude Opus 5.5
LMArena Text: KoreanNot measured1407Only Gemini 3.5 Flash Lite measured
LMArena Text: French14931451Claude Opus 5.5
LMArena Text: Spanish15081441Claude Opus 5.5
LMArena Text: Russian15171443Claude Opus 5.5
LMArena Text: PolishNot measured1437Only Gemini 3.5 Flash Lite measured
LMArena Text: multi-turn15011445Claude Opus 5.5
LMArena Text: longer queries15321435Claude Opus 5.5
LMArena Text: writing and language15321428Claude Opus 5.5
LMArena Text: entertainment and media15151414Claude Opus 5.5
LMArena Vision: English13171269Claude Opus 5.5
LMArena Vision: ChineseNot measured1311Only Gemini 3.5 Flash Lite measured
LMArena Vision: reading text13261280Claude Opus 5.5
LMArena Vision: humorNot measured1287Only Gemini 3.5 Flash Lite measured
LMArena Vision: creative writing13201260Claude Opus 5.5
Neither model has a result on the other 14 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 5.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Opus 5.5Gemini 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 5.5$0.014Fits 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 5.5$0.260Fits 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 5.5$1.00Fits in one request
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 5.5 and Gemini 3.5 Flash Lite
SpecificationAnthropic Claude Opus 5.5Google Gemini 3.5 Flash Lite
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 22, 2026July 21, 2026
Context window1M1.05M
Input $/Mtok$4.00$0.30
Output $/Mtok$20.00$2.50
Coding index88.849.0
Independent measurements behind it53
Cost per solved taskNot computable$0.41
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 5.5 better than Gemini 3.5 Flash Lite for coding?

Pick Claude Opus 5.5 for coding: it scores 88.8 on the Vibe Coding Index against 49.0 for Gemini 3.5 Flash Lite. Pick Gemini 3.5 Flash Lite for output tokens 8.0x cheaper ($2.50 vs $20.00 per million) and a larger context window (1.05M against 1M tokens).

Which is cheaper, Claude Opus 5.5 or Gemini 3.5 Flash Lite?

Claude Opus 5.5 costs $4.00 per million input tokens and $20.00 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 5.5 or Gemini 3.5 Flash Lite?

Gemini 3.5 Flash Lite, with 1.05M tokens against 1M.

How many benchmarks is the Claude Opus 5.5 vs Gemini 3.5 Flash Lite comparison based on?

67 benchmarks have a result for both models as of October 22, 2026. Claude Opus 5.5's coding index rests on 5 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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