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Claude Fable 5 vs Grok 4.7

Claude Fable 5 leads Grok 4.7 on coding, 79.3 to 66.7 on the Vibe Coding Index, and Grok 4.7 costs 8.3x less per output token ($6.00 vs $50.00 per million). Updated October 22, 2026; 89 benchmarks have a result for both.

Replace Claude Fable 5 Replace Grok 4.7
Claude Fable 5Anthropic
Coding
79.3
Overall
79.0
Output $/M
$50.00
84
Grok 4.7xAI
Coding
66.7
Overall
66.6
Output $/M
$6.00
5
vs boards won of 89 shared

Claude Fable 5 or Grok 4.7: which to pick

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 66.7 for Grok 4.7.

Pick Grok 4.7 for output tokens 8.3x cheaper ($6.00 vs $50.00 per million) and work measured by LMArena WebDev or LMArena WebDev: React, where it leads.

Model AClaude Fable 5Anthropic79.3/1006 independent benchmarks$2.16 per solved taskModel BGrok 4.7xAI66.7/1005 independent benchmarksNo cost per solved task
Shared results
89
Claude Fable 5 only
38
Grok 4.7 only
10
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, Grok 4.7 66.7 from 5 benchmarks.
Widest category
Math, 34.8 points apart on average over 6 shared benchmarks.
Widest single gap
FrontierMath, tier 4: Claude Fable 5 90.2% against Grok 4.7 17.1%, 73.1 points apart on a 0 to 100 scale.
Output price
Claude Fable 5 $50.00 against Grok 4.7 $6.00 per million output tokens, 8.3x apart.
Context window
Claude Fable 5 takes 1M tokens, Grok 4.7 500K.

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 5BarsGrok 4.7Ties
Coding132
Intelligence20
Agentic work91
Reasoning111
Math60
Knowledge70
Web design70
General291
All shared boards845
CodingLike-for-likeSix of these boards feed the Vibe Coding Index132
Coding benchmarks for Claude Fable 5 and Grok 4.7
BenchmarkClaude Fable 5Grok 4.7Leader
LiveBench coding98.3%84.5%Claude Fable 5
LMArena WebDev16241637Grok 4.7
AA Coding Index76.5Not measuredOnly Claude Fable 5 measured
LiveCodeBench (Vals AI)89.8%Not measuredOnly Claude Fable 5 measured
SWE-bench Verified (Vals AI)95.0%Not measuredOnly Claude Fable 5 measured
Terminal-Bench 4 (Vals AI)41.4%28.8%Claude Fable 5
Vibe Code Bench (Vals AI)90.3%86.2%Claude Fable 5
Code migration (Vals AI)55.1%44.8%Claude Fable 5
ProgramBench (Vals AI)2.0%0.5%Claude Fable 5
IOI (Vals AI)Not measured57.7%Only Grok 4.7 measured
Terminal-Bench 2.1 (Vals AI)80.5%73.4%Claude Fable 5
SWE-bench Multimodal (Vals AI)Not measured42.9%Only Grok 4.7 measured
CyberBench (Vals AI)Not measured69.5%Only Grok 4.7 measured
SciCode61.0%57.8%Claude Fable 5
Terminal-Bench Hard (Artificial Analysis run)62.9%Not measuredOnly Claude Fable 5 measured
FrontierCode53.5%47.6%Claude Fable 5
FrontierSWE47.0%29.5%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-Bench2041.3Not measuredOnly Claude Fable 5 measured
LMArena Text: coding15181432Claude Fable 5
LMArena Text: software and IT15131421Claude Fable 5
LMArena WebDev: React16311663Grok 4.7
LMArena WebDev: HTML16511627Claude Fable 5
LMArena WebDev: from an image16231586Claude Fable 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 Fable 5 and Grok 4.7
BenchmarkClaude Fable 5Grok 4.7Leader
AA Intelligence Index49.646.4Claude Fable 5
Epoch Capabilities Index163.4154.4Claude Fable 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index91
Agentic work benchmarks for Claude Fable 5 and Grok 4.7
BenchmarkClaude Fable 5Grok 4.7Leader
AA Agentic Index50.7Not measuredOnly Claude Fable 5 measured
Design Arena: agents building web apps1261Not measuredOnly Claude Fable 5 measured
Design Arena: agents building full-stack apps1280Not measuredOnly Claude Fable 5 measured
Design Arena: agents building mobile apps1264Not measuredOnly Claude Fable 5 measured
Design Arena: agents building Android apps1284Not measuredOnly Claude Fable 5 measured
Design Arena: agents building Godot games1292Not measuredOnly Claude Fable 5 measured
Design Arena: agents building games1285Not measuredOnly Claude Fable 5 measured
Design Arena: HTML slides1227Not measuredOnly Claude Fable 5 measured
Design Arena: PowerPoint slides1270Not measuredOnly Claude Fable 5 measured
LiveBench research86.9%86.4%Claude Fable 5
LiveBench browser92.0%60.0%Claude Fable 5
LiveBench long agentic53.2%50.1%Claude Fable 5
SREBench (Vals AI)Not measured3.8%Only Grok 4.7 measured
Finance Agent (Vals AI)56.3%52.3%Claude Fable 5
Tax Agent Bench (Vals AI)38.3%34.2%Claude Fable 5
Legal Research Bench (Vals AI)49.5%47.1%Claude Fable 5
Harvey's Legal Agent Benchmark (Vals AI)Not measured18.3%Only Grok 4.7 measured
Excel Modeling Benchmark (Vals AI)73.7%67.0%Claude Fable 5
BioMysteryBench (Vals AI)Not measured69.3%Only Grok 4.7 measured
Terminal-Bench-Science (Vals AI)15.7%10.0%Claude Fable 5
Vals Science IndexNot measured34.8%Only Grok 4.7 measured
Robo-bench (Vals AI)Not measured0.2%Only Grok 4.7 measured
τ²-Bench Telecom98.5%Not measuredOnly Claude Fable 5 measured
APEX-Agents63.6%54.6%Claude Fable 5
Remote Labor Index16.1%Not measuredOnly Claude Fable 5 measured
PostTrainBench41.8%Not measuredOnly Claude Fable 5 measured
Vending-Bench 2$5,680$10,537Grok 4.7
LMArena Search1229Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 13 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index111
Reasoning benchmarks for Claude Fable 5 and Grok 4.7
BenchmarkClaude Fable 5Grok 4.7Leader
GPQA Diamond93.2%Not measuredOnly Claude Fable 5 measured
LiveBench reasoning89.7%82.7%Claude Fable 5
MysteryMechanism (Vals AI)Not measured25.2%Only Grok 4.7 measured
MMMU Pro (Vals AI)89.3%Not measuredOnly Claude Fable 5 measured
GPQA Diamond (Artificial Analysis run)92.6%Not measuredOnly Claude Fable 5 measured
Humanity's Last Exam (Artificial Analysis run)55.5%43.1%Claude Fable 5
GPQA Diamond (Epoch AI run)85.9%92.7%Grok 4.7
ARC-AGI98.5%90.2%Claude Fable 5
ARC-AGI-289.2%61.4%Claude Fable 5
SimpleBench81.9%Not measuredOnly Claude Fable 5 measured
Chess puzzles47.0%41.0%Claude Fable 5
Mystery game puzzles52.0%29.0%Claude Fable 5
EBR-bench39.5%Not measuredOnly Claude Fable 5 measured
LMArena Text: hard prompts15071415Claude Fable 5
LMArena Text: expert15341439Claude Fable 5
LMArena Text: hard prompts in English15091427Claude Fable 5
LMArena Vision: diagrams13571254Claude Fable 5
LMArena Vision: homework13611309Claude Fable 5
Kagi LLM Benchmark91.4%Not measuredOnly Claude Fable 5 measured
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 Fable 5 and Grok 4.7
BenchmarkClaude Fable 5Grok 4.7Leader
OTIS Mock AIME100.0%98.1%Claude Fable 5
FrontierMath, tiers 1 to 387.0%53.0%Claude Fable 5
FrontierMath, tier 490.2%17.1%Claude Fable 5
ProofBench95.0%26.0%Claude Fable 5
LMArena Text: math15161414Claude Fable 5
LMArena Text: mathematical work15151435Claude Fable 5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index70
Knowledge benchmarks for Claude Fable 5 and Grok 4.7
BenchmarkClaude Fable 5Grok 4.7Leader
MMLU Pro91.5%Not measuredOnly Claude Fable 5 measured
LegalBench (Vals AI)88.6%84.4%Claude Fable 5
CorpFin (Vals AI)71.8%Not measuredOnly Claude Fable 5 measured
TaxEval (Vals AI)76.9%Not measuredOnly Claude Fable 5 measured
MortgageTax (Vals AI)68.9%Not measuredOnly Claude Fable 5 measured
MedCode (Vals AI)56.1%49.5%Claude Fable 5
SimpleQA Verified70.7%56.0%Claude Fable 5
LMArena Text: science15061419Claude Fable 5
LMArena Text: medicine and healthcare14801395Claude Fable 5
LMArena Text: legal and government14981423Claude Fable 5
LMArena Text: business and finance14801389Claude Fable 5
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index70
Web design benchmarks for Claude Fable 5 and Grok 4.7
BenchmarkClaude Fable 5Grok 4.7Leader
Design Arena: websites12951255Claude Fable 5
Design Arena: UI components13161275Claude Fable 5
Design Arena: game dev13351314Claude Fable 5
Design Arena: data viz13041238Claude Fable 5
Design Arena: 3D13181274Claude Fable 5
Design Arena: all code categories13101273Claude Fable 5
Design Arena: SVG1302Not measuredOnly Claude Fable 5 measured
Design Arena: ASCII art1329Not measuredOnly Claude Fable 5 measured
LiveBench design84.7%78.0%Claude Fable 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index291
General benchmarks for Claude Fable 5 and Grok 4.7
BenchmarkClaude Fable 5Grok 4.7Leader
Vals IndexNot measured58.6%Only Grok 4.7 measured
LiveBench data analysis80.5%76.9%Claude Fable 5
Public Benefits Bench (Vals AI)70.4%65.6%Claude Fable 5
SAGE (Vals AI)51.9%40.8%Claude Fable 5
MedScribe (Vals AI)88.5%89.4%Grok 4.7
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%80.0%Claude Fable 5
DTBench98.4%96.0%Claude Fable 5
LMCA61.2%49.4%Claude Fable 5
Surface Evolver Bench95.0%Not measuredOnly Claude Fable 5 measured
Furniture assembly35.8%20.8%Claude Fable 5
LMArena Text14911399Claude Fable 5
LMArena Text: instruction following15021406Claude Fable 5
LMArena Text: creative writing14941381Claude Fable 5
LMArena Vision13251231Claude Fable 5
LMArena Text: English14981411Claude Fable 5
LMArena Text: non-English14821386Claude Fable 5
LMArena Text: Chinese15431449Claude Fable 5
LMArena Text: German14861366Claude Fable 5
LMArena Text: Japanese15041359Claude Fable 5
LMArena Text: Korean14871383Claude Fable 5
LMArena Text: French15051431Claude Fable 5
LMArena Text: Spanish14981406Claude Fable 5
LMArena Text: Russian15031399Claude Fable 5
LMArena Text: Polish14941420Claude Fable 5
LMArena Text: multi-turn15041394Claude Fable 5
LMArena Text: longer queries15101416Claude Fable 5
LMArena Text: writing and language15011394Claude Fable 5
LMArena Text: entertainment and media14821376Claude Fable 5
LMArena Vision: English13231229Claude Fable 5
LMArena Vision: Chinese13731250Claude Fable 5
LMArena Vision: reading text13371241Claude Fable 5
LMArena Vision: humor1341Not measuredOnly Claude Fable 5 measured
LMArena Vision: creative writing13381217Claude Fable 5
LMArena Document1496Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 10 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 Grok 4.7
BenchmarkClaude Fable 5Grok 4.7Leader
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
Grok 4.7$0.0050Fits in one request

Grok 4.7 costs less

Repository review

50K input + 3K output tokens

Claude Fable 5$0.650Fits in one request
Grok 4.7$0.118Fits in one request

Grok 4.7 costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5$2.50Fits in one request
Grok 4.7$0.460Fits in one request

Grok 4.7 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 Grok 4.7
SpecificationAnthropic Claude Fable 5SpaceXAI Grok 4.7
MakerAnthropicxAI
WeightsNo public weights listedNo public weights listed
ReleasedJune 9, 2026September 21, 2026
Context window1M500K
Input $/Mtok$10.00$2.00
Output $/Mtok$50.00$6.00
Coding index79.366.7
Independent measurements behind it65
Cost per solved task$2.16Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5 better than Grok 4.7 for coding?

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 66.7 for Grok 4.7. Pick Grok 4.7 for output tokens 8.3x cheaper ($6.00 vs $50.00 per million) and work measured by LMArena WebDev or LMArena WebDev: React, where it leads.

Which is cheaper, Claude Fable 5 or Grok 4.7?

Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; Grok 4.7 costs $2.00 and $6.00. Cost per solved task is known for Claude Fable 5 only.

Which has the bigger context window, Claude Fable 5 or Grok 4.7?

Claude Fable 5, with 1M tokens against 500K.

How many benchmarks is the Claude Fable 5 vs Grok 4.7 comparison based on?

89 benchmarks have a result for both models as of October 22, 2026. Claude Fable 5's coding index rests on 6 independent benchmarks and Grok 4.7's on 5. Where only one model has a result, the page says so instead of naming a winner.

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