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Claude Sonnet 5.5 vs Gemini 3.5 Flash Lite

Claude Sonnet 5.5 leads Gemini 3.5 Flash Lite on coding, 87.3 to 49.0 on the Vibe Coding Index, and Gemini 3.5 Flash Lite costs 4.0x less per output token ($2.50 vs $10.00 per million). Updated October 22, 2026; 63 benchmarks have a result for both.

Replace Claude Sonnet 5.5 Replace Gemini 3.5 Flash Lite
Claude Sonnet 5.5Anthropic
Coding
87.3
Overall
82.8
Output $/M
$10.00
62
Gemini 3.5 Flash LiteGoogle
Coding
49.0
Overall
49.8
Output $/M
$2.50
1
vs boards won of 63 shared

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

Pick Claude Sonnet 5.5 for coding: it scores 87.3 on the Vibe Coding Index against 49.0 for Gemini 3.5 Flash Lite.

Pick Gemini 3.5 Flash Lite for output tokens 4.0x cheaper ($2.50 vs $10.00 per million) and a larger context window (1.05M against 1M tokens).

Model AClaude Sonnet 5.5Anthropic87.3/1005 independent benchmarksNo cost per solved taskModel BGemini 3.5 Flash LiteGoogle49.0/1003 independent benchmarks$0.41 per solved task
Shared results
63
Claude Sonnet 5.5 only
33
Gemini 3.5 Flash Lite only
22
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 Sonnet 5.5 87.3 from 5 benchmarks, Gemini 3.5 Flash Lite 49.0 from 3 benchmarks.
Widest category
Math, 47.1 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: Claude Sonnet 5.5 100.0% against Gemini 3.5 Flash Lite 13.0%, 87.0 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 5.5 $10.00 against Gemini 3.5 Flash Lite $2.50 per million output tokens, 4.0x apart.
Context window
Claude Sonnet 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 Sonnet 5.5BarsGemini 3.5 Flash LiteTies
Coding130
Intelligence20
Agentic work50
Reasoning90
Math60
Knowledge50
General221
All shared boards621
CodingLike-for-likeSix of these boards feed the Vibe Coding Index130
Coding benchmarks for Claude Sonnet 5.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Sonnet 5.5Gemini 3.5 Flash LiteLeader
LiveBench coding94.7%Not measuredOnly Claude Sonnet 5.5 measured
LMArena WebDev17681435Claude Sonnet 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)64.1%Not measuredOnly Claude Sonnet 5.5 measured
Vibe Code Bench (Vals AI)92.4%37.2%Claude Sonnet 5.5
Code migration (Vals AI)69.8%6.2%Claude Sonnet 5.5
ProgramBench (Vals AI)6.5%0.0%Claude Sonnet 5.5
IOI (Vals AI)83.1%Not measuredOnly Claude Sonnet 5.5 measured
Terminal-Bench 2.1 (Vals AI)83.2%50.2%Claude Sonnet 5.5
SWE-bench Multimodal (Vals AI)58.3%Not measuredOnly Claude Sonnet 5.5 measured
CyberBench (Vals AI)59.6%59.1%Claude Sonnet 5.5
SciCode61.0%41.3%Claude Sonnet 5.5
FrontierCode52.1%Not measuredOnly Claude Sonnet 5.5 measured
FrontierSWE61.9%Not measuredOnly Claude Sonnet 5.5 measured
WeirdMLNot measured39.0%Only Gemini 3.5 Flash Lite measured
ALE-Bench1819.1765.3Claude Sonnet 5.5
LMArena Text: coding15131453Claude Sonnet 5.5
LMArena Text: software and IT15041451Claude Sonnet 5.5
LMArena WebDev: React18171408Claude Sonnet 5.5
LMArena WebDev: HTML1741Not measuredOnly Claude Sonnet 5.5 measured
LMArena WebDev: from an image17371448Claude Sonnet 5.5
SciCode13.8%6.2%Claude Sonnet 5.5
Neither model has a result on the other 15 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Sonnet 5.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Sonnet 5.5Gemini 3.5 Flash LiteLeader
AA Intelligence Index56.022.2Claude Sonnet 5.5
Epoch Capabilities Index166.2144.9Claude Sonnet 5.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index50
Agentic work benchmarks for Claude Sonnet 5.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Sonnet 5.5Gemini 3.5 Flash LiteLeader
AA Agentic IndexNot measured14.3Only Gemini 3.5 Flash Lite measured
Design Arena: agents building web apps1305Not measuredOnly Claude Sonnet 5.5 measured
Design Arena: agents building mobile apps1260Not measuredOnly Claude Sonnet 5.5 measured
Design Arena: spreadsheets1260Not measuredOnly Claude Sonnet 5.5 measured
LiveBench research83.6%Not measuredOnly Claude Sonnet 5.5 measured
LiveBench browser84.0%Not measuredOnly Claude Sonnet 5.5 measured
LiveBench long agentic78.8%Not measuredOnly Claude Sonnet 5.5 measured
SREBench (Vals AI)30.1%Not measuredOnly Claude Sonnet 5.5 measured
Finance Agent (Vals AI)58.1%47.4%Claude Sonnet 5.5
Tax Agent Bench (Vals AI)42.0%7.2%Claude Sonnet 5.5
Legal Research Bench (Vals AI)48.1%13.9%Claude Sonnet 5.5
Harvey's Legal Agent Benchmark (Vals AI)10.4%Not measuredOnly Claude Sonnet 5.5 measured
Excel Modeling Benchmark (Vals AI)75.7%43.2%Claude Sonnet 5.5
BioMysteryBench (Vals AI)81.1%Not measuredOnly Claude Sonnet 5.5 measured
Terminal-Bench-Science (Vals AI)47.1%Not measuredOnly Claude Sonnet 5.5 measured
Vals Science Index59.1%Not measuredOnly Claude Sonnet 5.5 measured
APEX-Agents75.5%29.3%Claude Sonnet 5.5
SpireClimb1.3%Not measuredOnly Claude Sonnet 5.5 measured
Vending-Bench 2$11,165Not measuredOnly Claude Sonnet 5.5 measured
Neither model has a result on the other 22 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index90
Reasoning benchmarks for Claude Sonnet 5.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Sonnet 5.5Gemini 3.5 Flash LiteLeader
GPQA DiamondNot measured83.8%Only Gemini 3.5 Flash Lite measured
LiveBench reasoning91.6%Not measuredOnly Claude Sonnet 5.5 measured
MysteryMechanism (Vals AI)49.1%Not measuredOnly Claude Sonnet 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)55.0%18.8%Claude Sonnet 5.5
GPQA Diamond (Epoch AI run)95.6%83.3%Claude Sonnet 5.5
ARC-AGINot measured53.5%Only Gemini 3.5 Flash Lite measured
ARC-AGI-2Not measured10.3%Only Gemini 3.5 Flash Lite measured
Chess puzzles59.0%21.0%Claude Sonnet 5.5
Mystery game puzzles65.0%19.0%Claude Sonnet 5.5
LMArena Text: hard prompts14941441Claude Sonnet 5.5
LMArena Text: expert15311434Claude Sonnet 5.5
LMArena Text: hard prompts in English15021440Claude Sonnet 5.5
LMArena Vision: diagrams13291284Claude Sonnet 5.5
LMArena Vision: homework13311291Claude Sonnet 5.5
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Sonnet 5.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Sonnet 5.5Gemini 3.5 Flash LiteLeader
OTIS Mock AIME100.0%71.1%Claude Sonnet 5.5
FrontierMath, tiers 1 to 388.8%26.0%Claude Sonnet 5.5
FrontierMath, tier 480.5%0.0%Claude Sonnet 5.5
ProofBench100.0%13.0%Claude Sonnet 5.5
LMArena Text: math14971434Claude Sonnet 5.5
LMArena Text: mathematical work15101433Claude Sonnet 5.5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index50
Knowledge benchmarks for Claude Sonnet 5.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Sonnet 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)52.9%43.5%Claude Sonnet 5.5
SimpleQA Verified46.5%Not measuredOnly Claude Sonnet 5.5 measured
LMArena Text: science14831451Claude Sonnet 5.5
LMArena Text: medicine and healthcare14641438Claude Sonnet 5.5
LMArena Text: legal and government14831431Claude Sonnet 5.5
LMArena Text: business and finance14681423Claude Sonnet 5.5
FACTS Benchmark SuiteNot measured53.5%Only Gemini 3.5 Flash Lite measured
Neither model has a result on the other 6 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index7 boards, none shared
Web design benchmarks for Claude Sonnet 5.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Sonnet 5.5Gemini 3.5 Flash LiteLeader
Design Arena: websites1326Not measuredOnly Claude Sonnet 5.5 measured
Design Arena: UI components1368Not measuredOnly Claude Sonnet 5.5 measured
Design Arena: game dev1471Not measuredOnly Claude Sonnet 5.5 measured
Design Arena: data viz1392Not measuredOnly Claude Sonnet 5.5 measured
Design Arena: 3D1445Not measuredOnly Claude Sonnet 5.5 measured
Design Arena: all code categories1364Not measuredOnly Claude Sonnet 5.5 measured
LiveBench design85.0%Not measuredOnly Claude Sonnet 5.5 measured
Neither model has a result on the other 2 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index221
General benchmarks for Claude Sonnet 5.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Sonnet 5.5Gemini 3.5 Flash LiteLeader
Vals Index70.8%Not measuredOnly Claude Sonnet 5.5 measured
LiveBench data analysis59.5%Not measuredOnly Claude Sonnet 5.5 measured
Public Benefits Bench (Vals AI)67.2%51.8%Claude Sonnet 5.5
SAGE (Vals AI)51.8%47.3%Claude Sonnet 5.5
MedScribe (Vals AI)91.1%70.9%Claude Sonnet 5.5
Long context reasoning (AA-LCR)82.7%76.0%Claude Sonnet 5.5
DTBench97.3%83.5%Claude Sonnet 5.5
LMCA68.3%37.6%Claude Sonnet 5.5
Furniture assembly75.0%Not measuredOnly Claude Sonnet 5.5 measured
LMArena Text14731435Claude Sonnet 5.5
LMArena Text: instruction following14921419Claude Sonnet 5.5
LMArena Text: creative writing14671421Claude Sonnet 5.5
LMArena Vision12871269Claude Sonnet 5.5
LMArena Text: English14841438Claude Sonnet 5.5
LMArena Text: non-English14561427Claude Sonnet 5.5
LMArena Text: Chinese15351468Claude Sonnet 5.5
LMArena Text: GermanNot measured1454Only Gemini 3.5 Flash Lite measured
LMArena Text: JapaneseNot measured1426Only Gemini 3.5 Flash Lite measured
LMArena Text: KoreanNot measured1407Only Gemini 3.5 Flash Lite measured
LMArena Text: French14991451Claude Sonnet 5.5
LMArena Text: Spanish14511441Claude Sonnet 5.5
LMArena Text: Russian14541443Claude Sonnet 5.5
LMArena Text: PolishNot measured1437Only Gemini 3.5 Flash Lite measured
LMArena Text: multi-turn14651445Claude Sonnet 5.5
LMArena Text: longer queries14951435Claude Sonnet 5.5
LMArena Text: writing and language14741428Claude Sonnet 5.5
LMArena Text: entertainment and media14611414Claude Sonnet 5.5
LMArena Vision: English12891269Claude Sonnet 5.5
LMArena Vision: ChineseNot measured1311Only Gemini 3.5 Flash Lite measured
LMArena Vision: reading text12971280Claude Sonnet 5.5
LMArena Vision: humorNot measured1287Only Gemini 3.5 Flash Lite measured
LMArena Vision: creative writing12421260Gemini 3.5 Flash Lite
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 Sonnet 5.5 and Gemini 3.5 Flash Lite
BenchmarkClaude Sonnet 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 Sonnet 5.5$0.0070Fits 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 Sonnet 5.5$0.130Fits 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 Sonnet 5.5$0.500Fits 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 Sonnet 5.5 and Gemini 3.5 Flash Lite
SpecificationAnthropic Claude Sonnet 5.5Google Gemini 3.5 Flash Lite
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 28, 2026July 21, 2026
Context window1M1.05M
Input $/Mtok$2.00$0.30
Output $/Mtok$10.00$2.50
Coding index87.349.0
Independent measurements behind it53
Cost per solved taskNot computable$0.41
SourceOpenRouter listingOpenRouter listing

Questions

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

Pick Claude Sonnet 5.5 for coding: it scores 87.3 on the Vibe Coding Index against 49.0 for Gemini 3.5 Flash Lite. Pick Gemini 3.5 Flash Lite for output tokens 4.0x cheaper ($2.50 vs $10.00 per million) and a larger context window (1.05M against 1M tokens).

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

Claude Sonnet 5.5 costs $2.00 per million input tokens and $10.00 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 Sonnet 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 Sonnet 5.5 vs Gemini 3.5 Flash Lite comparison based on?

63 benchmarks have a result for both models as of October 22, 2026. Claude Sonnet 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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