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Claude Fable 5.1 vs Gemini 3.6 Flash

Claude Fable 5.1 leads Gemini 3.6 Flash on coding, 84.2 to 62.5 on the Vibe Coding Index, and Gemini 3.6 Flash costs 13.3x less per output token ($3.75 vs $50.00 per million). Updated October 22, 2026; 98 benchmarks have a result for both.

Replace Claude Fable 5.1 Replace Gemini 3.6 Flash
Claude Fable 5.1Anthropic
Coding
84.2
Overall
84.7
Output $/M
$50.00
96
Gemini 3.6 FlashGoogle
Coding
62.5
Overall
68.3
Output $/M
$3.75
1
vs boards won of 98 shared, 1 tied

Claude Fable 5.1 or Gemini 3.6 Flash: which to pick

Pick Claude Fable 5.1 for coding: it scores 84.2 on the Vibe Coding Index against 62.5 for Gemini 3.6 Flash.

Pick Gemini 3.6 Flash for output tokens 13.3x cheaper ($3.75 vs $50.00 per million) and a larger context window (1.05M against 1M tokens).

Model AClaude Fable 5.1Anthropic84.2/1005 independent benchmarksNo cost per solved taskModel BGemini 3.6 FlashGoogle62.5/1004 independent benchmarks$1.49 per solved task
Shared results
98
Claude Fable 5.1 only
26
Gemini 3.6 Flash only
11
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 Fable 5.1 84.2 from 5 benchmarks, Gemini 3.6 Flash 62.5 from 4 benchmarks.
Widest category
Math, 29.8 points apart on average over 6 shared benchmarks.
Widest single gap
FrontierMath, tier 4: Claude Fable 5.1 87.8% against Gemini 3.6 Flash 22.0%, 65.9 points apart on a 0 to 100 scale.
Output price
Claude Fable 5.1 $50.00 against Gemini 3.6 Flash $3.75 per million output tokens, 13.3x apart.
Context window
Claude Fable 5.1 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 Fable 5.1BarsGemini 3.6 FlashTies
Coding180
Intelligence20
Agentic work120
Reasoning1201 tie
Math60
Knowledge100
Web design70
General291
All shared boards9611 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index180
Coding benchmarks for Claude Fable 5.1 and Gemini 3.6 Flash
BenchmarkClaude Fable 5.1Gemini 3.6 FlashLeader
LiveBench coding97.7%Not measuredOnly Claude Fable 5.1 measured
LMArena WebDev17431538Claude Fable 5.1
AA Coding Index81.669.2Claude Fable 5.1
LiveCodeBench (Vals AI)90.5%88.1%Claude Fable 5.1
SWE-bench Verified (Vals AI)Not measured79.6%Only Gemini 3.6 Flash measured
Terminal-Bench 4 (Vals AI)58.1%Not measuredOnly Claude Fable 5.1 measured
Vibe Code Bench (Vals AI)90.3%64.0%Claude Fable 5.1
Code migration (Vals AI)54.6%30.9%Claude Fable 5.1
ProgramBench (Vals AI)7.0%0.0%Claude Fable 5.1
IOI (Vals AI)90.8%35.1%Claude Fable 5.1
Terminal-Bench 2.1 (Vals AI)85.0%73.8%Claude Fable 5.1
SWE-bench Multimodal (Vals AI)61.3%Not measuredOnly Claude Fable 5.1 measured
Vibe Code Bench 1-100 (Vals AI)28.0%Not measuredOnly Claude Fable 5.1 measured
SkillsBench (Vals AI)61.5%Not measuredOnly Claude Fable 5.1 measured
CyberBench (Vals AI)70.4%45.4%Claude Fable 5.1
SciCode63.1%53.4%Claude Fable 5.1
FrontierCode50.9%34.4%Claude Fable 5.1
FrontierSWE56.3%Not measuredOnly Claude Fable 5.1 measured
GSO-Bench88.2%Not measuredOnly Claude Fable 5.1 measured
WeirdML92.9%56.1%Claude Fable 5.1
MirrorCode73.3%Not measuredOnly Claude Fable 5.1 measured
ALE-Bench2143.2715.5Claude Fable 5.1
LMArena Text: coding15321491Claude Fable 5.1
LMArena Text: software and IT15301492Claude Fable 5.1
LMArena WebDev: React17921528Claude Fable 5.1
LMArena WebDev: HTML16841547Claude Fable 5.1
LMArena WebDev: from an image17221545Claude Fable 5.1
SciCodeNot measured10.8%Only Gemini 3.6 Flash measured
Neither model has a result on the other 11 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Fable 5.1 and Gemini 3.6 Flash
BenchmarkClaude Fable 5.1Gemini 3.6 FlashLeader
AA Intelligence Index53.434.0Claude Fable 5.1
Epoch Capabilities Index166.5154.5Claude Fable 5.1
Agentic workLike-for-likePublic boards, shown as published, kept out of the index120
Agentic work benchmarks for Claude Fable 5.1 and Gemini 3.6 Flash
BenchmarkClaude Fable 5.1Gemini 3.6 FlashLeader
AA Agentic Index57.929.0Claude Fable 5.1
Design Arena: agents building web apps13181197Claude Fable 5.1
Design Arena: agents building full-stack apps13261181Claude Fable 5.1
Design Arena: agents building mobile apps12671198Claude Fable 5.1
Design Arena: agents building Android appsNot measured1204Only Gemini 3.6 Flash measured
Design Arena: agents building Godot games1327Not measuredOnly Claude Fable 5.1 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 slides13051121Claude Fable 5.1
Design Arena: spreadsheets13801071Claude Fable 5.1
LiveBench research82.0%Not measuredOnly Claude Fable 5.1 measured
LiveBench browser100.0%Not measuredOnly Claude Fable 5.1 measured
LiveBench long agentic80.8%Not measuredOnly Claude Fable 5.1 measured
SREBench (Vals AI)22.9%Not measuredOnly Claude Fable 5.1 measured
Finance Agent (Vals AI)58.9%56.3%Claude Fable 5.1
Tax Agent Bench (Vals AI)49.2%18.0%Claude Fable 5.1
Legal Research Bench (Vals AI)55.3%25.0%Claude Fable 5.1
Excel Modeling Benchmark (Vals AI)76.7%65.4%Claude Fable 5.1
BioMysteryBench (Vals AI)Not measured58.5%Only Gemini 3.6 Flash measured
Terminal-Bench-Science (Vals AI)40.0%4.3%Claude Fable 5.1
Time Horizon Index (Vals AI)63.3%Not measuredOnly Claude Fable 5.1 measured
CUA-bench (Vals AI)13.2%Not measuredOnly Claude Fable 5.1 measured
Robo-bench (Vals AI)5.8%Not measuredOnly Claude Fable 5.1 measured
APEX-Agents68.6%46.9%Claude Fable 5.1
Remote Labor Index17.9%Not measuredOnly Claude Fable 5.1 measured
SpireClimb2.0%Not measuredOnly Claude Fable 5.1 measured
Vending-Bench 2$5,422Not measuredOnly Claude Fable 5.1 measured
LMArena Search1246Not measuredOnly Claude Fable 5.1 measured
Neither model has a result on the other 13 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index120
Reasoning benchmarks for Claude Fable 5.1 and Gemini 3.6 Flash
BenchmarkClaude Fable 5.1Gemini 3.6 FlashLeader
GPQA Diamond93.4%93.4%Tie
LiveBench reasoning91.7%Not measuredOnly Claude Fable 5.1 measured
MysteryMechanism (Vals AI)47.8%Not measuredOnly Claude Fable 5.1 measured
MMMU Pro (Vals AI)90.6%88.4%Claude Fable 5.1
GPQA Diamond (Artificial Analysis run)93.7%92.8%Claude Fable 5.1
Humanity's Last Exam (Artificial Analysis run)59.1%40.8%Claude Fable 5.1
GPQA Diamond (Epoch AI run)Not measured94.1%Only Gemini 3.6 Flash measured
ARC-AGI97.5%91.2%Claude Fable 5.1
ARC-AGI-290.0%60.4%Claude Fable 5.1
Chess puzzles48.0%42.0%Claude Fable 5.1
Mystery game puzzles58.0%30.0%Claude Fable 5.1
EBR-bench57.1%Not measuredOnly Claude Fable 5.1 measured
LMArena Text: hard prompts15281486Claude Fable 5.1
LMArena Text: expert15441490Claude Fable 5.1
LMArena Text: hard prompts in English15221484Claude Fable 5.1
LMArena Vision: diagrams13431314Claude Fable 5.1
LMArena Vision: homework13451314Claude Fable 5.1
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 Fable 5.1 and Gemini 3.6 Flash
BenchmarkClaude Fable 5.1Gemini 3.6 FlashLeader
OTIS Mock AIME100.0%94.2%Claude Fable 5.1
FrontierMath, tiers 1 to 390.2%58.9%Claude Fable 5.1
FrontierMath, tier 487.8%22.0%Claude Fable 5.1
ProofBench100.0%36.0%Claude Fable 5.1
LMArena Text: math15311508Claude Fable 5.1
LMArena Text: mathematical work15411492Claude Fable 5.1
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index100
Knowledge benchmarks for Claude Fable 5.1 and Gemini 3.6 Flash
BenchmarkClaude Fable 5.1Gemini 3.6 FlashLeader
MMLU Pro92.4%89.3%Claude Fable 5.1
LegalBench (Vals AI)88.5%86.7%Claude Fable 5.1
CorpFin (Vals AI)Not measured63.3%Only Gemini 3.6 Flash measured
TaxEval (Vals AI)76.0%74.9%Claude Fable 5.1
MortgageTax (Vals AI)70.8%67.6%Claude Fable 5.1
MedCode (Vals AI)53.5%53.1%Claude Fable 5.1
SimpleQA Verified70.8%66.2%Claude Fable 5.1
LMArena Text: science15321489Claude Fable 5.1
LMArena Text: medicine and healthcare15311469Claude Fable 5.1
LMArena Text: legal and government15141479Claude Fable 5.1
LMArena Text: business and finance14931464Claude Fable 5.1
FACTS Benchmark SuiteNot measured65.3%Only Gemini 3.6 Flash measured
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 Fable 5.1 and Gemini 3.6 Flash
BenchmarkClaude Fable 5.1Gemini 3.6 FlashLeader
Design Arena: websites13121300Claude Fable 5.1
Design Arena: UI components13361294Claude Fable 5.1
Design Arena: game dev13811263Claude Fable 5.1
Design Arena: data viz13441289Claude Fable 5.1
Design Arena: 3D13921271Claude Fable 5.1
Design Arena: all code categories13351289Claude Fable 5.1
Design Arena: SVG1300Not measuredOnly Claude Fable 5.1 measured
Design Arena: ASCII art13231281Claude Fable 5.1
LiveBench design83.4%Not measuredOnly Claude Fable 5.1 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index291
General benchmarks for Claude Fable 5.1 and Gemini 3.6 Flash
BenchmarkClaude Fable 5.1Gemini 3.6 FlashLeader
LiveBench data analysis80.3%Not measuredOnly Claude Fable 5.1 measured
Public Benefits Bench (Vals AI)74.9%56.6%Claude Fable 5.1
SAGE (Vals AI)48.5%48.7%Gemini 3.6 Flash
MedScribe (Vals AI)91.3%79.7%Claude Fable 5.1
Vals Multimodal IndexNot measured65.1%Only Gemini 3.6 Flash measured
Long context reasoning (AA-LCR)85.3%80.0%Claude Fable 5.1
DTBench97.6%95.5%Claude Fable 5.1
LMCA65.5%44.9%Claude Fable 5.1
Furniture assembly70.0%23.3%Claude Fable 5.1
LMArena Text15121480Claude Fable 5.1
LMArena Text: instruction following15181467Claude Fable 5.1
LMArena Text: creative writing15091466Claude Fable 5.1
LMArena Vision13191299Claude Fable 5.1
LMArena Text: English15061482Claude Fable 5.1
LMArena Text: non-English15081470Claude Fable 5.1
LMArena Text: Chinese15841531Claude Fable 5.1
LMArena Text: German14991480Claude Fable 5.1
LMArena Text: Japanese15621475Claude Fable 5.1
LMArena Text: Korean15171429Claude Fable 5.1
LMArena Text: French15231503Claude Fable 5.1
LMArena Text: Spanish15201476Claude Fable 5.1
LMArena Text: Russian15201488Claude Fable 5.1
LMArena Text: Polish15251473Claude Fable 5.1
LMArena Text: multi-turn14931481Claude Fable 5.1
LMArena Text: longer queries15241475Claude Fable 5.1
LMArena Text: writing and language15101470Claude Fable 5.1
LMArena Text: entertainment and media14971456Claude Fable 5.1
LMArena Vision: English13131295Claude Fable 5.1
LMArena Vision: Chinese13911357Claude Fable 5.1
LMArena Vision: reading text13271312Claude Fable 5.1
LMArena Vision: humor13181289Claude Fable 5.1
LMArena Vision: creative writing13301278Claude Fable 5.1
LMArena DocumentNot measured1456Only Gemini 3.6 Flash 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 Fable 5.1 and Gemini 3.6 Flash
BenchmarkClaude Fable 5.1Gemini 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 Fable 5.1$0.035Fits 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 Fable 5.1$0.650Fits 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 Fable 5.1$2.50Fits 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 Fable 5.1 and Gemini 3.6 Flash
SpecificationAnthropic Claude Fable 5.1Google Gemini 3.6 Flash
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 1, 2026July 21, 2026
Context window1M1.05M
Input $/Mtok$10.00$0.75
Output $/Mtok$50.00$3.75
Coding index84.262.5
Independent measurements behind it54
Cost per solved taskNot computable$1.49
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5.1 better than Gemini 3.6 Flash for coding?

Pick Claude Fable 5.1 for coding: it scores 84.2 on the Vibe Coding Index against 62.5 for Gemini 3.6 Flash. Pick Gemini 3.6 Flash for output tokens 13.3x cheaper ($3.75 vs $50.00 per million) and a larger context window (1.05M against 1M tokens).

Which is cheaper, Claude Fable 5.1 or Gemini 3.6 Flash?

Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 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 Fable 5.1 or Gemini 3.6 Flash?

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

How many benchmarks is the Claude Fable 5.1 vs Gemini 3.6 Flash comparison based on?

98 benchmarks have a result for both models as of October 22, 2026. Claude Fable 5.1'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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