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Claude Fable 5.1 vs Grok 4.7

Updated October 21, 2026. 94 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Fable 5.1 Replace Grok 4.7
Claude Fable 5.1Anthropic
Coding
89.1
Overall
53.4
Output $/M
$50.00
92
Grok 4.7xAI
Coding
75.0
Overall
46.4
Output $/M
$6.00
2
vs boards won of 94 shared

Decision reading

Pick Claude Fable 5.1 for coding: it scores 89.1 on the Vibe Coding Index against 75.0 for Grok 4.7.

Pick Grok 4.7 when output tokens cost 8.3x less, or when what matters is LiveBench research or Vending-Bench 2, where it leads.

Model AClaude Fable 5.1Anthropic89.1/1002 independent benchmarksNo cost per solved taskModel BGrok 4.7xAI75.0/1002 independent benchmarksNo cost per solved task
Shared results
94
Claude Fable 5.1 only
30
Grok 4.7 only
5
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 Fable 5.1 89.1 from 2 benchmarks, Grok 4.7 75.0 from 2 benchmarks.
Widest category
Math, 36.8 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: Claude Fable 5.1 100.0% against Grok 4.7 26.0%, 74.0 points apart on a 0 to 100 scale.
Output price
Claude Fable 5.1 $50.00 against Grok 4.7 $6.00 per million output tokens, 8.3x apart.
Context window
Claude Fable 5.1 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 5.1BarsGrok 4.7Ties
Coding180
Intelligence20
Agentic work102
Reasoning120
Math60
Knowledge70
Web design70
General300
All shared boards922
CodingLike-for-likeFour of these boards feed the Vibe Coding Index180
Coding benchmarks for Claude Fable 5.1 and Grok 4.7
BenchmarkClaude Fable 5.1Grok 4.7Leader
LiveBench coding97.7%84.5%Claude Fable 5.1
LMArena WebDev17431637Claude Fable 5.1
AA Coding Index81.6Not measuredOnly Claude Fable 5.1 measured
LiveCodeBench (Vals AI)90.5%Not measuredOnly Claude Fable 5.1 measured
Terminal-Bench 4 (Vals AI)58.1%28.8%Claude Fable 5.1
Vibe Code Bench (Vals AI)90.3%86.2%Claude Fable 5.1
Code migration (Vals AI)54.6%44.8%Claude Fable 5.1
ProgramBench (Vals AI)7.0%0.5%Claude Fable 5.1
IOI (Vals AI)90.8%57.7%Claude Fable 5.1
Terminal-Bench 2.1 (Vals AI)85.0%73.4%Claude Fable 5.1
SWE-bench Multimodal (Vals AI)61.3%42.9%Claude Fable 5.1
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%69.5%Claude Fable 5.1
SciCode63.1%57.8%Claude Fable 5.1
FrontierCode50.9%47.6%Claude Fable 5.1
FrontierSWE56.3%29.5%Claude Fable 5.1
GSO-Bench88.2%Not measuredOnly Claude Fable 5.1 measured
WeirdML92.9%Not measuredOnly Claude Fable 5.1 measured
MirrorCode73.3%Not measuredOnly Claude Fable 5.1 measured
ALE-Bench2143.2Not measuredOnly Claude Fable 5.1 measured
LMArena Text: coding15321432Claude Fable 5.1
LMArena Text: software and IT15301421Claude Fable 5.1
LMArena WebDev: React17921663Claude Fable 5.1
LMArena WebDev: HTML16841627Claude Fable 5.1
LMArena WebDev: from an image17221586Claude Fable 5.1
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 5.1 and Grok 4.7
BenchmarkClaude Fable 5.1Grok 4.7Leader
AA Intelligence Index53.446.4Claude Fable 5.1
Epoch Capabilities Index166.5154.4Claude Fable 5.1
Agentic workLike-for-likePublic boards, shown as published, kept out of the index102
Agentic work benchmarks for Claude Fable 5.1 and Grok 4.7
BenchmarkClaude Fable 5.1Grok 4.7Leader
AA Agentic Index57.9Not measuredOnly Claude Fable 5.1 measured
Design Arena: agents building web apps1318Not measuredOnly Claude Fable 5.1 measured
Design Arena: agents building full-stack apps1326Not measuredOnly Claude Fable 5.1 measured
Design Arena: agents building mobile apps1267Not measuredOnly Claude Fable 5.1 measured
Design Arena: agents building Godot games1327Not measuredOnly Claude Fable 5.1 measured
Design Arena: PowerPoint slides1328Not measuredOnly Claude Fable 5.1 measured
Design Arena: spreadsheets1374Not measuredOnly Claude Fable 5.1 measured
LiveBench research82.0%86.4%Grok 4.7
LiveBench browser100.0%60.0%Claude Fable 5.1
LiveBench long agentic80.8%50.1%Claude Fable 5.1
SREBench (Vals AI)22.9%3.8%Claude Fable 5.1
Finance Agent (Vals AI)58.9%52.3%Claude Fable 5.1
Tax Agent Bench (Vals AI)49.2%34.2%Claude Fable 5.1
Legal Research Bench (Vals AI)55.3%47.1%Claude Fable 5.1
Harvey's Legal Agent Benchmark (Vals AI)Not measured18.3%Only Grok 4.7 measured
Excel Modeling Benchmark (Vals AI)76.7%67.0%Claude Fable 5.1
BioMysteryBench (Vals AI)Not measured69.3%Only Grok 4.7 measured
Terminal-Bench-Science (Vals AI)40.0%10.0%Claude Fable 5.1
Vals Science IndexNot measured34.8%Only Grok 4.7 measured
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%0.2%Claude Fable 5.1
APEX-Agents68.6%54.6%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$5,422$10,537Grok 4.7
LMArena Search1246Not measuredOnly Claude Fable 5.1 measured
Neither model has a result on the other 12 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index120
Reasoning benchmarks for Claude Fable 5.1 and Grok 4.7
BenchmarkClaude Fable 5.1Grok 4.7Leader
GPQA Diamond93.4%Not measuredOnly Claude Fable 5.1 measured
LiveBench reasoning91.7%82.7%Claude Fable 5.1
MysteryMechanism (Vals AI)47.8%25.2%Claude Fable 5.1
MMMU Pro (Vals AI)90.6%Not measuredOnly Claude Fable 5.1 measured
GPQA Diamond (Artificial Analysis run)93.7%Not measuredOnly Claude Fable 5.1 measured
Humanity's Last Exam (Artificial Analysis run)59.1%43.1%Claude Fable 5.1
GPQA Diamond (Epoch AI run)Not measured92.7%Only Grok 4.7 measured
ARC-AGI97.5%90.2%Claude Fable 5.1
ARC-AGI-290.0%61.4%Claude Fable 5.1
Chess puzzles48.0%41.0%Claude Fable 5.1
Mystery game puzzles58.0%29.0%Claude Fable 5.1
EBR-bench57.1%Not measuredOnly Claude Fable 5.1 measured
LMArena Text: hard prompts15281415Claude Fable 5.1
LMArena Text: expert15441439Claude Fable 5.1
LMArena Text: hard prompts in English15221427Claude Fable 5.1
LMArena Vision: diagrams13431254Claude Fable 5.1
LMArena Vision: homework13451309Claude Fable 5.1
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 5.1 and Grok 4.7
BenchmarkClaude Fable 5.1Grok 4.7Leader
OTIS Mock AIME100.0%98.1%Claude Fable 5.1
FrontierMath, tiers 1 to 390.2%53.0%Claude Fable 5.1
FrontierMath, tier 487.8%17.1%Claude Fable 5.1
ProofBench100.0%26.0%Claude Fable 5.1
LMArena Text: math15311414Claude Fable 5.1
LMArena Text: mathematical work15411435Claude 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 index70
Knowledge benchmarks for Claude Fable 5.1 and Grok 4.7
BenchmarkClaude Fable 5.1Grok 4.7Leader
MMLU Pro92.4%Not measuredOnly Claude Fable 5.1 measured
LegalBench (Vals AI)88.5%84.4%Claude Fable 5.1
TaxEval (Vals AI)76.0%Not measuredOnly Claude Fable 5.1 measured
MortgageTax (Vals AI)70.8%Not measuredOnly Claude Fable 5.1 measured
MedCode (Vals AI)53.5%49.5%Claude Fable 5.1
SimpleQA Verified70.8%56.0%Claude Fable 5.1
LMArena Text: science15321419Claude Fable 5.1
LMArena Text: medicine and healthcare15311395Claude Fable 5.1
LMArena Text: legal and government15141423Claude Fable 5.1
LMArena Text: business and finance14931389Claude Fable 5.1
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 5.1 and Grok 4.7
BenchmarkClaude Fable 5.1Grok 4.7Leader
Design Arena: websites13131255Claude Fable 5.1
Design Arena: UI components13381271Claude Fable 5.1
Design Arena: game dev13821314Claude Fable 5.1
Design Arena: data viz13441227Claude Fable 5.1
Design Arena: 3D13931269Claude Fable 5.1
Design Arena: all code categories13361271Claude Fable 5.1
Design Arena: SVG1301Not measuredOnly Claude Fable 5.1 measured
Design Arena: ASCII art1324Not measuredOnly Claude Fable 5.1 measured
LiveBench design83.4%78.0%Claude Fable 5.1
GeneralLike-for-likePublic boards, shown as published, kept out of the index300
General benchmarks for Claude Fable 5.1 and Grok 4.7
BenchmarkClaude Fable 5.1Grok 4.7Leader
Vals IndexNot measured58.6%Only Grok 4.7 measured
LiveBench data analysis80.3%76.9%Claude Fable 5.1
Public Benefits Bench (Vals AI)74.9%65.6%Claude Fable 5.1
SAGE (Vals AI)48.5%40.8%Claude Fable 5.1
MedScribe (Vals AI)91.3%89.4%Claude Fable 5.1
Long context reasoning (AA-LCR)85.3%80.0%Claude Fable 5.1
DTBench97.6%96.0%Claude Fable 5.1
LMCA65.5%49.4%Claude Fable 5.1
Furniture assembly70.0%20.8%Claude Fable 5.1
LMArena Text15121399Claude Fable 5.1
LMArena Text: instruction following15181406Claude Fable 5.1
LMArena Text: creative writing15091381Claude Fable 5.1
LMArena Vision13191231Claude Fable 5.1
LMArena Text: English15061411Claude Fable 5.1
LMArena Text: non-English15081386Claude Fable 5.1
LMArena Text: Chinese15841449Claude Fable 5.1
LMArena Text: German14991366Claude Fable 5.1
LMArena Text: Japanese15621359Claude Fable 5.1
LMArena Text: Korean15171383Claude Fable 5.1
LMArena Text: French15231431Claude Fable 5.1
LMArena Text: Spanish15201406Claude Fable 5.1
LMArena Text: Russian15201399Claude Fable 5.1
LMArena Text: Polish15251420Claude Fable 5.1
LMArena Text: multi-turn14931394Claude Fable 5.1
LMArena Text: longer queries15241416Claude Fable 5.1
LMArena Text: writing and language15101394Claude Fable 5.1
LMArena Text: entertainment and media14971376Claude Fable 5.1
LMArena Vision: English13131229Claude Fable 5.1
LMArena Vision: Chinese13911250Claude Fable 5.1
LMArena Vision: reading text13271241Claude Fable 5.1
LMArena Vision: humor1318Not measuredOnly Claude Fable 5.1 measured
LMArena Vision: creative writing13301217Claude Fable 5.1
Neither model has a result on the other 14 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 Grok 4.7
BenchmarkClaude Fable 5.1Grok 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 5.1$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 5.1$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 5.1$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 5.1 and Grok 4.7
SpecificationAnthropic Claude Fable 5.1SpaceXAI Grok 4.7
MakerAnthropicxAI
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 1, 2026September 21, 2026
Context window1M500K
Input $/Mtok$10.00$2.00
Output $/Mtok$50.00$6.00
Coding index89.175.0
Independent measurements behind it22
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5.1 better than Grok 4.7 for coding?

Pick Claude Fable 5.1 for coding: it scores 89.1 on the Vibe Coding Index against 75.0 for Grok 4.7. Pick Grok 4.7 when output tokens cost 8.3x less, or when what matters is LiveBench research or Vending-Bench 2, where it leads.

Which is cheaper, Claude Fable 5.1 or Grok 4.7?

Claude Fable 5.1 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 neither of them.

Which has the bigger context window, Claude Fable 5.1 or Grok 4.7?

Claude Fable 5.1, with 1M tokens against 500K.

How many benchmarks is the Claude Fable 5.1 vs Grok 4.7 comparison based on?

94 benchmarks have a result for both models as of October 21, 2026. Claude Fable 5.1's coding index rests on 2 independent benchmarks and Grok 4.7's on 2. Where only one model has a result, the page says so instead of naming a winner.

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