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Claude Opus 5 vs Gemini 3.6 Flash

Updated October 21, 2026. 105 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Opus 5 Replace Gemini 3.6 Flash
Claude Opus 5Anthropic
Coding
81.8
Overall
50.8
Output $/M
$25.00
102
Gemini 3.6 FlashGoogle
Coding
48.3
Overall
34.0
Output $/M
$3.75
2
vs boards won of 105 shared, 1 tied

Decision reading

Pick Claude Opus 5 for coding: it scores 81.8 on the Vibe Coding Index against 48.3 for Gemini 3.6 Flash.

Pick Gemini 3.6 Flash when output tokens cost 6.7x less, or when the context window is larger, 1.05M against 1M tokens.

Model AClaude Opus 5Anthropic81.8/1002 independent benchmarks$1.33 per solved taskModel BGemini 3.6 FlashGoogle48.3/1001 independent benchmark$1.49 per solved task
Shared results
105
Claude Opus 5 only
25
Gemini 3.6 Flash only
2
Like-for-like categories
8 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 5 81.8 from 2 benchmarks, Gemini 3.6 Flash 48.3 from 1 benchmark.
Widest category
Math, 26.4 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: Claude Opus 5 99.0% against Gemini 3.6 Flash 36.0%, 63.0 points apart on a 0 to 100 scale.
Output price
Claude Opus 5 $25.00 against Gemini 3.6 Flash $3.75 per million output tokens, 6.7x apart.
Context window
Claude Opus 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 5BarsGemini 3.6 FlashTies
Coding190
Intelligence20
Agentic work140
Reasoning1211 tie
Math60
Knowledge101
Web design70
General320
All shared boards10221 tie
CodingLike-for-likeFour of these boards feed the Vibe Coding Index190
Coding benchmarks for Claude Opus 5 and Gemini 3.6 Flash
BenchmarkClaude Opus 5Gemini 3.6 FlashLeader
LiveBench coding90.8%Not measuredOnly Claude Opus 5 measured
LMArena WebDev16891538Claude Opus 5
AA Coding Index78.069.2Claude Opus 5
LiveCodeBench (Vals AI)89.0%88.1%Claude Opus 5
SWE-bench Verified (Vals AI)97.0%79.6%Claude Opus 5
Terminal-Bench 4 (Vals AI)53.5%Not measuredOnly Claude Opus 5 measured
Vibe Code Bench (Vals AI)88.4%64.0%Claude Opus 5
Code migration (Vals AI)57.5%30.9%Claude Opus 5
ProgramBench (Vals AI)3.0%0.0%Claude Opus 5
IOI (Vals AI)84.3%35.1%Claude Opus 5
Terminal-Bench 2.1 (Vals AI)84.6%73.8%Claude Opus 5
Vibe Code Bench 1-100 (Vals AI)28.5%Not measuredOnly Claude Opus 5 measured
SkillsBench (Vals AI)60.4%Not measuredOnly Claude Opus 5 measured
CyberBench (Vals AI)65.4%45.4%Claude Opus 5
SciCode56.4%53.4%Claude Opus 5
FrontierCode53.4%34.4%Claude Opus 5
FrontierSWE52.0%Not measuredOnly Claude Opus 5 measured
WeirdML91.8%56.1%Claude Opus 5
ALE-Bench2164.6715.5Claude Opus 5
LMArena Text: coding15331491Claude Opus 5
LMArena Text: software and IT15271492Claude Opus 5
LMArena WebDev: React17111528Claude Opus 5
LMArena WebDev: HTML16801547Claude Opus 5
LMArena WebDev: from an image16621545Claude Opus 5
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 5 and Gemini 3.6 Flash
BenchmarkClaude Opus 5Gemini 3.6 FlashLeader
AA Intelligence Index50.834.0Claude Opus 5
Epoch Capabilities Index163.9154.5Claude Opus 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index140
Agentic work benchmarks for Claude Opus 5 and Gemini 3.6 Flash
BenchmarkClaude Opus 5Gemini 3.6 FlashLeader
AA Agentic Index56.529.0Claude Opus 5
Design Arena: agents building web apps12661197Claude Opus 5
Design Arena: agents building full-stack apps13061181Claude Opus 5
Design Arena: agents building mobile apps13481199Claude Opus 5
Design Arena: agents building Android apps12581208Claude Opus 5
Design Arena: agents building Godot games1279Not measuredOnly Claude Opus 5 measured
Design Arena: agents building games12611181Claude Opus 5
Design Arena: HTML slidesNot measured1148Only Gemini 3.6 Flash measured
Design Arena: PowerPoint slides12651146Claude Opus 5
Design Arena: spreadsheetsNot measured1017Only Gemini 3.6 Flash measured
LiveBench research88.9%Not measuredOnly Claude Opus 5 measured
LiveBench browser84.0%Not measuredOnly Claude Opus 5 measured
LiveBench long agentic62.1%Not measuredOnly Claude Opus 5 measured
SREBench (Vals AI)12.2%Not measuredOnly Claude Opus 5 measured
Finance Agent (Vals AI)58.6%56.3%Claude Opus 5
Tax Agent Bench (Vals AI)45.5%18.0%Claude Opus 5
Legal Research Bench (Vals AI)55.3%25.0%Claude Opus 5
Excel Modeling Benchmark (Vals AI)73.6%65.4%Claude Opus 5
BioMysteryBench (Vals AI)79.3%58.5%Claude Opus 5
Terminal-Bench-Science (Vals AI)27.1%4.3%Claude Opus 5
Vals Science Index47.9%Not measuredOnly Claude Opus 5 measured
Time Horizon Index (Vals AI)18.8%Not measuredOnly Claude Opus 5 measured
CUA-bench (Vals AI)9.0%Not measuredOnly Claude Opus 5 measured
APEX-Agents65.8%46.9%Claude Opus 5
OSWorld 2.031.4%Not measuredOnly Claude Opus 5 measured
BALROG63.4%Not measuredOnly Claude Opus 5 measured
PostTrainBench35.0%Not measuredOnly Claude Opus 5 measured
Vending-Bench 2$11,182Not measuredOnly Claude Opus 5 measured
LMArena Search1242Not measuredOnly Claude Opus 5 measured
Neither model has a result on the other 10 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index121
Reasoning benchmarks for Claude Opus 5 and Gemini 3.6 Flash
BenchmarkClaude Opus 5Gemini 3.6 FlashLeader
GPQA Diamond93.4%93.4%Tie
LiveBench reasoning91.2%Not measuredOnly Claude Opus 5 measured
MysteryMechanism (Vals AI)37.4%Not measuredOnly Claude Opus 5 measured
MMMU Pro (Vals AI)89.9%88.4%Claude Opus 5
GPQA Diamond (Artificial Analysis run)93.7%92.8%Claude Opus 5
Humanity's Last Exam (Artificial Analysis run)54.9%40.8%Claude Opus 5
GPQA Diamond (Epoch AI run)93.9%94.1%Gemini 3.6 Flash
ARC-AGI97.5%91.2%Claude Opus 5
ARC-AGI-290.4%60.4%Claude Opus 5
SimpleBench80.6%Not measuredOnly Claude Opus 5 measured
Chess puzzles43.0%42.0%Claude Opus 5
Mystery game puzzles59.0%30.0%Claude Opus 5
EBR-bench45.7%Not measuredOnly Claude Opus 5 measured
LMArena Text: hard prompts15271486Claude Opus 5
LMArena Text: expert15541490Claude Opus 5
LMArena Text: hard prompts in English15231484Claude Opus 5
LMArena Vision: diagrams13481314Claude Opus 5
LMArena Vision: homework13381314Claude Opus 5
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Opus 5 and Gemini 3.6 Flash
BenchmarkClaude Opus 5Gemini 3.6 FlashLeader
OTIS Mock AIME98.9%94.2%Claude Opus 5
FrontierMath, tiers 1 to 385.6%58.9%Claude Opus 5
FrontierMath, tier 473.2%22.0%Claude Opus 5
ProofBench99.0%36.0%Claude Opus 5
LMArena Text: math15331508Claude Opus 5
LMArena Text: mathematical work15441492Claude Opus 5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index101
Knowledge benchmarks for Claude Opus 5 and Gemini 3.6 Flash
BenchmarkClaude Opus 5Gemini 3.6 FlashLeader
MMLU Pro91.6%89.3%Claude Opus 5
LegalBench (Vals AI)87.0%86.7%Claude Opus 5
CorpFin (Vals AI)73.2%63.3%Claude Opus 5
TaxEval (Vals AI)75.1%74.9%Claude Opus 5
MortgageTax (Vals AI)72.1%67.6%Claude Opus 5
MedCode (Vals AI)63.6%53.1%Claude Opus 5
SimpleQA Verified59.9%66.2%Gemini 3.6 Flash
LMArena Text: science15311489Claude Opus 5
LMArena Text: medicine and healthcare15251469Claude Opus 5
LMArena Text: legal and government15301479Claude Opus 5
LMArena Text: business and finance15011464Claude Opus 5
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index70
Web design benchmarks for Claude Opus 5 and Gemini 3.6 Flash
BenchmarkClaude Opus 5Gemini 3.6 FlashLeader
Design Arena: websites13091301Claude Opus 5
Design Arena: UI components13481297Claude Opus 5
Design Arena: game dev13391263Claude Opus 5
Design Arena: data viz13291289Claude Opus 5
Design Arena: 3D13351272Claude Opus 5
Design Arena: all code categories13241290Claude Opus 5
Design Arena: SVG1310Not measuredOnly Claude Opus 5 measured
Design Arena: ASCII art13521281Claude Opus 5
LiveBench design83.0%Not measuredOnly Claude Opus 5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index320
General benchmarks for Claude Opus 5 and Gemini 3.6 Flash
BenchmarkClaude Opus 5Gemini 3.6 FlashLeader
LiveBench data analysis74.6%Not measuredOnly Claude Opus 5 measured
Public Benefits Bench (Vals AI)76.9%56.6%Claude Opus 5
SAGE (Vals AI)49.4%48.7%Claude Opus 5
MedScribe (Vals AI)91.0%79.7%Claude Opus 5
Vals Multimodal Index73.9%65.1%Claude Opus 5
Long context reasoning (AA-LCR)82.0%80.0%Claude Opus 5
DTBench97.9%95.5%Claude Opus 5
LMCA64.5%44.9%Claude Opus 5
Furniture assembly60.8%23.3%Claude Opus 5
LMArena Text15091480Claude Opus 5
LMArena Text: instruction following15181467Claude Opus 5
LMArena Text: creative writing14931466Claude Opus 5
LMArena Vision13201299Claude Opus 5
LMArena Text: English15081482Claude Opus 5
LMArena Text: non-English15021470Claude Opus 5
LMArena Text: Chinese15731531Claude Opus 5
LMArena Text: German15271480Claude Opus 5
LMArena Text: Japanese15201475Claude Opus 5
LMArena Text: Korean15171429Claude Opus 5
LMArena Text: French15191503Claude Opus 5
LMArena Text: Spanish15231476Claude Opus 5
LMArena Text: Russian15071488Claude Opus 5
LMArena Text: Polish15221473Claude Opus 5
LMArena Text: multi-turn15001481Claude Opus 5
LMArena Text: longer queries15171475Claude Opus 5
LMArena Text: writing and language14991470Claude Opus 5
LMArena Text: entertainment and media14811456Claude Opus 5
LMArena Vision: English13151295Claude Opus 5
LMArena Vision: Chinese14001357Claude Opus 5
LMArena Vision: reading text13291312Claude Opus 5
LMArena Vision: humor12931289Claude Opus 5
LMArena Vision: creative writing13131278Claude Opus 5
LMArena Document15161456Claude Opus 5
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 5 and Gemini 3.6 Flash
BenchmarkClaude Opus 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$0.018Fits 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$0.325Fits 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$1.25Fits 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 and Gemini 3.6 Flash
SpecificationAnthropic Claude Opus 5Google Gemini 3.6 Flash
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedJuly 24, 2026July 21, 2026
Context window1M1.05M
Input $/Mtok$5.00$0.75
Output $/Mtok$25.00$3.75
Coding index81.848.3
Independent measurements behind it21
Cost per solved task$1.33$1.49
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 5 better than Gemini 3.6 Flash for coding?

Pick Claude Opus 5 for coding: it scores 81.8 on the Vibe Coding Index against 48.3 for Gemini 3.6 Flash. Pick Gemini 3.6 Flash when output tokens cost 6.7x less, or when the context window is larger, 1.05M against 1M tokens.

Which is cheaper, Claude Opus 5 or Gemini 3.6 Flash?

Claude Opus 5 costs $5.00 per million input tokens and $25.00 per million output tokens; Gemini 3.6 Flash costs $0.75 and $3.75. Per solved SWE-bench Verified task, Claude Opus 5 costs $1.33 and Gemini 3.6 Flash $1.49.

Which has the bigger context window, Claude Opus 5 or Gemini 3.6 Flash?

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

How many benchmarks is the Claude Opus 5 vs Gemini 3.6 Flash comparison based on?

105 benchmarks have a result for both models as of October 21, 2026. Claude Opus 5's coding index rests on 2 independent benchmarks and Gemini 3.6 Flash's on 1. Where only one model has a result, the page says so instead of naming a winner.

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