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Claude Fable 5 vs Gemini 3.7 Flash

Claude Fable 5 leads Gemini 3.7 Flash on coding, 79.3 to 58.0 on the Vibe Coding Index, and Gemini 3.7 Flash costs 13.3x less per output token ($3.75 vs $50.00 per million). Updated October 21, 2026; 107 benchmarks have a result for both.

Replace Claude Fable 5 Replace Gemini 3.7 Flash
Claude Fable 5Anthropic
Coding
79.3
Overall
79.0
Output $/M
$50.00
89
Gemini 3.7 FlashGoogle
Coding
58.0
Overall
65.7
Output $/M
$3.75
18
vs boards won of 107 shared

Claude Fable 5 or Gemini 3.7 Flash: which to pick

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 58.0 for Gemini 3.7 Flash.

Pick Gemini 3.7 Flash for output tokens 13.3x cheaper ($3.75 vs $50.00 per million) and a lower cost per solved task ($1.78 against $2.16).

Model AClaude Fable 5Anthropic79.3/1006 independent benchmarks$2.16 per solved taskModel BGemini 3.7 FlashGoogle58.0/1006 independent benchmarks$1.78 per solved task
Shared results
107
Claude Fable 5 only
20
Gemini 3.7 Flash only
7
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 79.3 from 6 benchmarks, Gemini 3.7 Flash 58.0 from 6 benchmarks.
Widest category
Math, 18.7 points apart on average over 6 shared benchmarks.
Widest single gap
FrontierMath, tier 4: Claude Fable 5 90.2% against Gemini 3.7 Flash 36.6%, 53.6 points apart on a 0 to 100 scale.
Output price
Claude Fable 5 $50.00 against Gemini 3.7 Flash $3.75 per million output tokens, 13.3x apart.
Context window
Claude Fable 5 takes 1M tokens, Gemini 3.7 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 5BarsGemini 3.7 FlashTies
Coding190
Intelligence20
Agentic work142
Reasoning114
Math60
Knowledge82
Web design72
General228
All shared boards8918
CodingLike-for-likeSix of these boards feed the Vibe Coding Index190
Coding benchmarks for Claude Fable 5 and Gemini 3.7 Flash
BenchmarkClaude Fable 5Gemini 3.7 FlashLeader
LiveBench coding98.3%80.5%Claude Fable 5
LMArena WebDev16241591Claude Fable 5
AA Coding Index76.571.5Claude Fable 5
LiveCodeBench (Vals AI)89.8%88.7%Claude Fable 5
SWE-bench Verified (Vals AI)95.0%80.8%Claude Fable 5
Terminal-Bench 4 (Vals AI)41.4%12.1%Claude Fable 5
Vibe Code Bench (Vals AI)90.3%70.4%Claude Fable 5
Code migration (Vals AI)55.1%34.8%Claude Fable 5
ProgramBench (Vals AI)2.0%0.0%Claude Fable 5
IOI (Vals AI)Not measured67.8%Only Gemini 3.7 Flash measured
Terminal-Bench 2.1 (Vals AI)80.5%77.5%Claude Fable 5
SkillsBench (Vals AI)Not measured65.9%Only Gemini 3.7 Flash measured
CyberBench (Vals AI)Not measured43.8%Only Gemini 3.7 Flash measured
SciCode61.0%59.8%Claude Fable 5
Terminal-Bench Hard (Artificial Analysis run)62.9%Not measuredOnly Claude Fable 5 measured
FrontierCode53.5%43.6%Claude Fable 5
FrontierSWE47.0%20.3%Claude Fable 5
GSO-Bench78.4%Not measuredOnly Claude Fable 5 measured
WeirdML91.9%Not measuredOnly Claude Fable 5 measured
MirrorCode63.9%Not measuredOnly Claude Fable 5 measured
ALE-Bench2041.3904.3Claude Fable 5
LMArena Text: coding15181499Claude Fable 5
LMArena Text: software and IT15131498Claude Fable 5
LMArena WebDev: React16311587Claude Fable 5
LMArena WebDev: HTML16511593Claude Fable 5
LMArena WebDev: from an image16231599Claude Fable 5
SciCodeNot measured13.8%Only Gemini 3.7 Flash measured
Neither model has a result on the other 12 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Fable 5 and Gemini 3.7 Flash
BenchmarkClaude Fable 5Gemini 3.7 FlashLeader
AA Intelligence Index49.639.6Claude Fable 5
Epoch Capabilities Index163.4158.0Claude Fable 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index142
Agentic work benchmarks for Claude Fable 5 and Gemini 3.7 Flash
BenchmarkClaude Fable 5Gemini 3.7 FlashLeader
AA Agentic Index50.7Not measuredOnly Claude Fable 5 measured
Design Arena: agents building web apps12611223Claude Fable 5
Design Arena: agents building full-stack apps12801208Claude Fable 5
Design Arena: agents building mobile apps12641230Claude Fable 5
Design Arena: agents building Android apps12831242Claude Fable 5
Design Arena: agents building Godot games12921264Claude Fable 5
Design Arena: agents building games12851235Claude Fable 5
Design Arena: HTML slides1277Not measuredOnly Claude Fable 5 measured
Design Arena: PowerPoint slides1295Not measuredOnly Claude Fable 5 measured
Design Arena: spreadsheetsNot measured1053Only Gemini 3.7 Flash measured
LiveBench research86.9%76.5%Claude Fable 5
LiveBench browser92.0%56.0%Claude Fable 5
LiveBench long agentic53.2%28.3%Claude Fable 5
SREBench (Vals AI)Not measured4.6%Only Gemini 3.7 Flash measured
Finance Agent (Vals AI)56.3%59.0%Gemini 3.7 Flash
Tax Agent Bench (Vals AI)38.3%22.8%Claude Fable 5
Legal Research Bench (Vals AI)49.5%34.6%Claude Fable 5
Excel Modeling Benchmark (Vals AI)73.7%71.3%Claude Fable 5
Terminal-Bench-Science (Vals AI)15.7%7.1%Claude Fable 5
τ²-Bench Telecom98.5%Not measuredOnly Claude Fable 5 measured
APEX-Agents63.6%67.8%Gemini 3.7 Flash
Remote Labor Index16.1%5.0%Claude Fable 5
PostTrainBench41.8%Not measuredOnly Claude Fable 5 measured
Vending-Bench 2$5,680Not measuredOnly Claude Fable 5 measured
LMArena Search1229Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 16 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index114
Reasoning benchmarks for Claude Fable 5 and Gemini 3.7 Flash
BenchmarkClaude Fable 5Gemini 3.7 FlashLeader
GPQA Diamond93.2%93.9%Gemini 3.7 Flash
LiveBench reasoning89.7%87.8%Claude Fable 5
MMMU Pro (Vals AI)89.3%89.0%Claude Fable 5
GPQA Diamond (Artificial Analysis run)92.6%94.5%Gemini 3.7 Flash
Humanity's Last Exam (Artificial Analysis run)55.5%47.9%Claude Fable 5
GPQA Diamond (Epoch AI run)85.9%94.8%Gemini 3.7 Flash
ARC-AGI98.5%95.5%Claude Fable 5
ARC-AGI-289.2%84.6%Claude Fable 5
SimpleBench81.9%Not measuredOnly Claude Fable 5 measured
Chess puzzles47.0%66.0%Gemini 3.7 Flash
Mystery game puzzles52.0%37.0%Claude Fable 5
EBR-bench39.5%Not measuredOnly Claude Fable 5 measured
LMArena Text: hard prompts15071495Claude Fable 5
LMArena Text: expert15341512Claude Fable 5
LMArena Text: hard prompts in English15091487Claude Fable 5
LMArena Vision: diagrams13571329Claude Fable 5
LMArena Vision: homework13611320Claude Fable 5
Kagi LLM Benchmark91.4%Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Fable 5 and Gemini 3.7 Flash
BenchmarkClaude Fable 5Gemini 3.7 FlashLeader
OTIS Mock AIME100.0%97.2%Claude Fable 5
FrontierMath, tiers 1 to 387.0%71.6%Claude Fable 5
FrontierMath, tier 490.2%36.6%Claude Fable 5
ProofBench95.0%58.0%Claude Fable 5
LMArena Text: math15161511Claude Fable 5
LMArena Text: mathematical work15151502Claude Fable 5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index82
Knowledge benchmarks for Claude Fable 5 and Gemini 3.7 Flash
BenchmarkClaude Fable 5Gemini 3.7 FlashLeader
MMLU Pro91.5%90.1%Claude Fable 5
LegalBench (Vals AI)88.6%87.3%Claude Fable 5
CorpFin (Vals AI)71.8%Not measuredOnly Claude Fable 5 measured
TaxEval (Vals AI)76.9%74.7%Claude Fable 5
MortgageTax (Vals AI)68.9%66.7%Claude Fable 5
MedCode (Vals AI)56.1%53.4%Claude Fable 5
SimpleQA Verified70.7%69.2%Claude Fable 5
LMArena Text: science15061511Gemini 3.7 Flash
LMArena Text: medicine and healthcare14801494Gemini 3.7 Flash
LMArena Text: legal and government14981496Claude Fable 5
LMArena Text: business and finance14801479Claude Fable 5
FACTS Benchmark SuiteNot measured71.2%Only Gemini 3.7 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 index72
Web design benchmarks for Claude Fable 5 and Gemini 3.7 Flash
BenchmarkClaude Fable 5Gemini 3.7 FlashLeader
Design Arena: websites12961304Gemini 3.7 Flash
Design Arena: UI components13191299Claude Fable 5
Design Arena: game dev13351318Claude Fable 5
Design Arena: data viz13041315Gemini 3.7 Flash
Design Arena: 3D13191308Claude Fable 5
Design Arena: all code categories13101308Claude Fable 5
Design Arena: SVG13021283Claude Fable 5
Design Arena: ASCII art13291276Claude Fable 5
LiveBench design84.7%73.2%Claude Fable 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index228
General benchmarks for Claude Fable 5 and Gemini 3.7 Flash
BenchmarkClaude Fable 5Gemini 3.7 FlashLeader
LiveBench data analysis80.5%68.0%Claude Fable 5
Public Benefits Bench (Vals AI)70.4%Not measuredOnly Claude Fable 5 measured
SAGE (Vals AI)51.9%49.2%Claude Fable 5
MedScribe (Vals AI)88.5%83.9%Claude Fable 5
Vals Multimodal Index74.2%Not measuredOnly Claude Fable 5 measured
IFBench63.5%Not measuredOnly Claude Fable 5 measured
Long context reasoning (AA-LCR)82.3%83.0%Gemini 3.7 Flash
DTBench98.4%96.8%Claude Fable 5
LMCA61.2%50.4%Claude Fable 5
Surface Evolver Bench95.0%Not measuredOnly Claude Fable 5 measured
Furniture assembly35.8%26.7%Claude Fable 5
LMArena Text14911489Claude Fable 5
LMArena Text: instruction following15021484Claude Fable 5
LMArena Text: creative writing14941488Claude Fable 5
LMArena Vision13251314Claude Fable 5
LMArena Text: English14981483Claude Fable 5
LMArena Text: non-English14821487Gemini 3.7 Flash
LMArena Text: Chinese15431552Gemini 3.7 Flash
LMArena Text: German14861506Gemini 3.7 Flash
LMArena Text: Japanese15041511Gemini 3.7 Flash
LMArena Text: Korean14871481Claude Fable 5
LMArena Text: French15051500Claude Fable 5
LMArena Text: Spanish14981495Claude Fable 5
LMArena Text: Russian15031515Gemini 3.7 Flash
LMArena Text: Polish14941503Gemini 3.7 Flash
LMArena Text: multi-turn15041485Claude Fable 5
LMArena Text: longer queries15101492Claude Fable 5
LMArena Text: writing and language15011491Claude Fable 5
LMArena Text: entertainment and media14821477Claude Fable 5
LMArena Vision: English13231309Claude Fable 5
LMArena Vision: Chinese13731394Gemini 3.7 Flash
LMArena Vision: reading text13371322Claude Fable 5
LMArena Vision: humor13411299Claude Fable 5
LMArena Vision: creative writing13381312Claude Fable 5
LMArena Document1496Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 11 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Fable 5 and Gemini 3.7 Flash
BenchmarkClaude Fable 5Gemini 3.7 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$0.035Fits in one request
Gemini 3.7 Flash$0.0026Fits in one request

Gemini 3.7 Flash costs less

Repository review

50K input + 3K output tokens

Claude Fable 5$0.650Fits in one request
Gemini 3.7 Flash$0.049Fits in one request

Gemini 3.7 Flash costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5$2.50Fits in one request
Gemini 3.7 Flash$0.188Fits in one request

Gemini 3.7 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 and Gemini 3.7 Flash
SpecificationAnthropic Claude Fable 5Google Gemini 3.7 Flash
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedJune 9, 2026August 13, 2026
Context window1M1.05M
Input $/Mtok$10.00$0.75
Output $/Mtok$50.00$3.75
Coding index79.358.0
Independent measurements behind it66
Cost per solved task$2.16$1.78
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5 better than Gemini 3.7 Flash for coding?

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 58.0 for Gemini 3.7 Flash. Pick Gemini 3.7 Flash for output tokens 13.3x cheaper ($3.75 vs $50.00 per million) and a lower cost per solved task ($1.78 against $2.16).

Which is cheaper, Claude Fable 5 or Gemini 3.7 Flash?

Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; Gemini 3.7 Flash costs $0.75 and $3.75. Per solved SWE-bench Verified task, Claude Fable 5 costs $2.16 and Gemini 3.7 Flash $1.78.

Which has the bigger context window, Claude Fable 5 or Gemini 3.7 Flash?

Gemini 3.7 Flash, with 1.05M tokens against 1M.

How many benchmarks is the Claude Fable 5 vs Gemini 3.7 Flash comparison based on?

107 benchmarks have a result for both models as of October 21, 2026. Claude Fable 5's coding index rests on 6 independent benchmarks and Gemini 3.7 Flash's on 6. Where only one model has a result, the page says so instead of naming a winner.

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