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Claude Opus 5.5 vs Gemini 3.6 Flash

Claude Opus 5.5 leads Gemini 3.6 Flash on coding, 88.8 to 62.5 on the Vibe Coding Index, and Gemini 3.6 Flash costs 5.3x less per output token ($3.75 vs $20.00 per million). Updated October 22, 2026; 83 benchmarks have a result for both.

Replace Claude Opus 5.5 Replace Gemini 3.6 Flash
Claude Opus 5.5Anthropic
Coding
88.8
Overall
87.1
Output $/M
$20.00
78
Gemini 3.6 FlashGoogle
Coding
62.5
Overall
68.3
Output $/M
$3.75
5
vs boards won of 83 shared

Claude Opus 5.5 or Gemini 3.6 Flash: which to pick

Pick Claude Opus 5.5 for coding: it scores 88.8 on the Vibe Coding Index against 62.5 for Gemini 3.6 Flash.

Pick Gemini 3.6 Flash for output tokens 5.3x cheaper ($3.75 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 3.6 FlashGoogle62.5/1004 independent benchmarks$1.49 per solved task
Shared results
83
Claude Opus 5.5 only
26
Gemini 3.6 Flash only
26
Like-for-like categories
8 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 3.6 Flash 62.5 from 4 benchmarks.
Widest category
Math, 30.1 points apart on average over 6 shared benchmarks.
Widest single gap
FrontierMath, tier 4: Claude Opus 5.5 95.0% against Gemini 3.6 Flash 22.0%, 73.0 points apart on a 0 to 100 scale.
Output price
Claude Opus 5.5 $20.00 against Gemini 3.6 Flash $3.75 per million output tokens, 5.3x apart.
Context window
Claude Opus 5.5 takes 1M tokens, Gemini 3.6 Flash 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 3.6 FlashTies
Coding160
Intelligence20
Agentic work100
Reasoning101
Math60
Knowledge52
Web design60
General232
All shared boards785
CodingLike-for-likeSix of these boards feed the Vibe Coding Index160
Coding benchmarks for Claude Opus 5.5 and Gemini 3.6 Flash
BenchmarkClaude Opus 5.5Gemini 3.6 FlashLeader
LiveBench coding96.3%Not measuredOnly Claude Opus 5.5 measured
LMArena WebDev18071538Claude Opus 5.5
AA Coding IndexNot measured69.2Only Gemini 3.6 Flash measured
LiveCodeBench (Vals AI)Not measured88.1%Only Gemini 3.6 Flash measured
SWE-bench Verified (Vals AI)Not measured79.6%Only Gemini 3.6 Flash measured
Terminal-Bench 4 (Vals AI)65.2%Not measuredOnly Claude Opus 5.5 measured
Vibe Code Bench (Vals AI)90.3%64.0%Claude Opus 5.5
Code migration (Vals AI)66.7%30.9%Claude Opus 5.5
ProgramBench (Vals AI)18.5%0.0%Claude Opus 5.5
IOI (Vals AI)95.1%35.1%Claude Opus 5.5
Terminal-Bench 2.1 (Vals AI)87.6%73.8%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%45.4%Claude Opus 5.5
SciCode66.9%53.4%Claude Opus 5.5
FrontierCode54.6%34.4%Claude Opus 5.5
FrontierSWE62.3%Not measuredOnly Claude Opus 5.5 measured
WeirdMLNot measured56.1%Only Gemini 3.6 Flash measured
MirrorCode77.4%Not measuredOnly Claude Opus 5.5 measured
ALE-Bench2147.4715.5Claude Opus 5.5
LMArena Text: coding15451491Claude Opus 5.5
LMArena Text: software and IT15381492Claude Opus 5.5
LMArena WebDev: React18551528Claude Opus 5.5
LMArena WebDev: HTML17531547Claude Opus 5.5
LMArena WebDev: from an image17531545Claude Opus 5.5
SciCode18.5%10.8%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 3.6 Flash
BenchmarkClaude Opus 5.5Gemini 3.6 FlashLeader
AA Intelligence Index57.634.0Claude Opus 5.5
Epoch Capabilities Index168.8154.5Claude Opus 5.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index100
Agentic work benchmarks for Claude Opus 5.5 and Gemini 3.6 Flash
BenchmarkClaude Opus 5.5Gemini 3.6 FlashLeader
AA Agentic IndexNot measured29.0Only Gemini 3.6 Flash measured
Design Arena: agents building web apps13161197Claude Opus 5.5
Design Arena: agents building full-stack appsNot measured1181Only Gemini 3.6 Flash measured
Design Arena: agents building mobile apps13081198Claude Opus 5.5
Design Arena: agents building Android appsNot measured1204Only Gemini 3.6 Flash measured
Design Arena: agents building gamesNot measured1180Only Gemini 3.6 Flash measured
Design Arena: HTML slidesNot measured1099Only Gemini 3.6 Flash measured
Design Arena: PowerPoint slidesNot measured1121Only Gemini 3.6 Flash measured
Design Arena: spreadsheets13681071Claude Opus 5.5
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%56.3%Claude Opus 5.5
Tax Agent Bench (Vals AI)45.6%18.0%Claude Opus 5.5
Legal Research Bench (Vals AI)50.5%25.0%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%65.4%Claude Opus 5.5
BioMysteryBench (Vals AI)79.3%58.5%Claude Opus 5.5
Terminal-Bench-Science (Vals AI)47.1%4.3%Claude Opus 5.5
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%46.9%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 12 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index101
Reasoning benchmarks for Claude Opus 5.5 and Gemini 3.6 Flash
BenchmarkClaude Opus 5.5Gemini 3.6 FlashLeader
GPQA DiamondNot measured93.4%Only Gemini 3.6 Flash 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 measured88.4%Only Gemini 3.6 Flash measured
GPQA Diamond (Artificial Analysis run)Not measured92.8%Only Gemini 3.6 Flash measured
Humanity's Last Exam (Artificial Analysis run)61.4%40.8%Claude Opus 5.5
GPQA Diamond (Epoch AI run)90.6%94.1%Gemini 3.6 Flash
ARC-AGI98.5%91.2%Claude Opus 5.5
ARC-AGI-293.3%60.4%Claude Opus 5.5
Chess puzzles67.0%42.0%Claude Opus 5.5
Mystery game puzzles71.0%30.0%Claude Opus 5.5
EBR-bench71.4%Not measuredOnly Claude Opus 5.5 measured
LMArena Text: hard prompts15361486Claude Opus 5.5
LMArena Text: expert15491490Claude Opus 5.5
LMArena Text: hard prompts in English15351484Claude Opus 5.5
LMArena Vision: diagrams13451314Claude Opus 5.5
LMArena Vision: homework13621314Claude 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 3.6 Flash
BenchmarkClaude Opus 5.5Gemini 3.6 FlashLeader
OTIS Mock AIME100.0%94.2%Claude Opus 5.5
FrontierMath, tiers 1 to 391.2%58.9%Claude Opus 5.5
FrontierMath, tier 495.0%22.0%Claude Opus 5.5
ProofBench100.0%36.0%Claude Opus 5.5
LMArena Text: math15181508Claude Opus 5.5
LMArena Text: mathematical work15161492Claude 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 index52
Knowledge benchmarks for Claude Opus 5.5 and Gemini 3.6 Flash
BenchmarkClaude Opus 5.5Gemini 3.6 FlashLeader
MMLU ProNot measured89.3%Only Gemini 3.6 Flash measured
LegalBench (Vals AI)Not measured86.7%Only Gemini 3.6 Flash measured
CorpFin (Vals AI)Not measured63.3%Only Gemini 3.6 Flash measured
TaxEval (Vals AI)Not measured74.9%Only Gemini 3.6 Flash measured
MortgageTax (Vals AI)Not measured67.6%Only Gemini 3.6 Flash measured
MedCode (Vals AI)49.8%53.1%Gemini 3.6 Flash
SimpleQA Verified72.2%66.2%Claude Opus 5.5
LMArena Text: science15241489Claude Opus 5.5
LMArena Text: medicine and healthcare15091469Claude Opus 5.5
LMArena Text: legal and government15181479Claude Opus 5.5
LMArena Text: business and finance14941464Claude Opus 5.5
FACTS Benchmark Suite65.3%65.3%Gemini 3.6 Flash
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index60
Web design benchmarks for Claude Opus 5.5 and Gemini 3.6 Flash
BenchmarkClaude Opus 5.5Gemini 3.6 FlashLeader
Design Arena: websites13351300Claude Opus 5.5
Design Arena: UI components13851294Claude Opus 5.5
Design Arena: game dev14611263Claude Opus 5.5
Design Arena: data viz13971289Claude Opus 5.5
Design Arena: 3D14761271Claude Opus 5.5
Design Arena: all code categories13901289Claude Opus 5.5
Design Arena: SVG1329Not measuredOnly Claude Opus 5.5 measured
Design Arena: ASCII artNot measured1281Only Gemini 3.6 Flash measured
LiveBench design86.9%Not measuredOnly Claude Opus 5.5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index232
General benchmarks for Claude Opus 5.5 and Gemini 3.6 Flash
BenchmarkClaude Opus 5.5Gemini 3.6 FlashLeader
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%56.6%Claude Opus 5.5
SAGE (Vals AI)45.8%48.7%Gemini 3.6 Flash
MedScribe (Vals AI)91.4%79.7%Claude Opus 5.5
Vals Multimodal IndexNot measured65.1%Only Gemini 3.6 Flash measured
Long context reasoning (AA-LCR)84.7%80.0%Claude Opus 5.5
DTBench98.9%95.5%Claude Opus 5.5
LMCA68.2%44.9%Claude Opus 5.5
Furniture assembly83.3%23.3%Claude Opus 5.5
LMArena Text15161480Claude Opus 5.5
LMArena Text: instruction following15371467Claude Opus 5.5
LMArena Text: creative writing15351466Claude Opus 5.5
LMArena Vision13211299Claude Opus 5.5
LMArena Text: English15191482Claude Opus 5.5
LMArena Text: non-English15071470Claude Opus 5.5
LMArena Text: Chinese15821531Claude Opus 5.5
LMArena Text: GermanNot measured1480Only Gemini 3.6 Flash measured
LMArena Text: Japanese15341475Claude Opus 5.5
LMArena Text: KoreanNot measured1429Only Gemini 3.6 Flash measured
LMArena Text: French14931503Gemini 3.6 Flash
LMArena Text: Spanish15081476Claude Opus 5.5
LMArena Text: Russian15171488Claude Opus 5.5
LMArena Text: PolishNot measured1473Only Gemini 3.6 Flash measured
LMArena Text: multi-turn15011481Claude Opus 5.5
LMArena Text: longer queries15321475Claude Opus 5.5
LMArena Text: writing and language15321470Claude Opus 5.5
LMArena Text: entertainment and media15151456Claude Opus 5.5
LMArena Vision: English13171295Claude Opus 5.5
LMArena Vision: ChineseNot measured1357Only Gemini 3.6 Flash measured
LMArena Vision: reading text13261312Claude Opus 5.5
LMArena Vision: humorNot measured1289Only Gemini 3.6 Flash measured
LMArena Vision: creative writing13201278Claude Opus 5.5
LMArena DocumentNot measured1456Only Gemini 3.6 Flash measured
Neither model has a result on the other 12 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 3.6 Flash
BenchmarkClaude Opus 5.5Gemini 3.6 FlashLeader
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 3.6 Flash$0.0026Fits in one request

Gemini 3.6 Flash costs less

Repository review

50K input + 3K output tokens

Claude Opus 5.5$0.260Fits in one request
Gemini 3.6 Flash$0.049Fits in one request

Gemini 3.6 Flash costs less

Agent loop

200K input + 10K output tokens

Claude Opus 5.5$1.00Fits in one request
Gemini 3.6 Flash$0.188Fits in one request

Gemini 3.6 Flash 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 3.6 Flash
SpecificationAnthropic Claude Opus 5.5Google Gemini 3.6 Flash
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 22, 2026July 21, 2026
Context window1M1.05M
Input $/Mtok$4.00$0.75
Output $/Mtok$20.00$3.75
Coding index88.862.5
Independent measurements behind it54
Cost per solved taskNot computable$1.49
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 5.5 better than Gemini 3.6 Flash for coding?

Pick Claude Opus 5.5 for coding: it scores 88.8 on the Vibe Coding Index against 62.5 for Gemini 3.6 Flash. Pick Gemini 3.6 Flash for output tokens 5.3x cheaper ($3.75 vs $20.00 per million) and a larger context window (1.05M against 1M tokens).

Which is cheaper, Claude Opus 5.5 or Gemini 3.6 Flash?

Claude Opus 5.5 costs $4.00 per million input tokens and $20.00 per million output tokens; Gemini 3.6 Flash costs $0.75 and $3.75. Cost per solved task is known for Gemini 3.6 Flash only.

Which has the bigger context window, Claude Opus 5.5 or Gemini 3.6 Flash?

Gemini 3.6 Flash, with 1.05M tokens against 1M.

How many benchmarks is the Claude Opus 5.5 vs Gemini 3.6 Flash comparison based on?

83 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 3.6 Flash's on 4. Where only one model has a result, the page says so instead of naming a winner.

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