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Claude Fable 5.1 vs Grok 4.6

Claude Fable 5.1 leads Grok 4.6 on coding, 84.2 to 65.7 on the Vibe Coding Index, and Grok 4.6 costs 8.3x less per output token ($6.00 vs $50.00 per million). Updated October 22, 2026; 113 benchmarks have a result for both.

Replace Claude Fable 5.1 Replace Grok 4.6
Claude Fable 5.1Anthropic
Coding
84.2
Overall
84.7
Output $/M
$50.00
109
Grok 4.6xAI
Coding
65.7
Overall
67.4
Output $/M
$6.00
4
vs boards won of 113 shared

Claude Fable 5.1 or Grok 4.6: which to pick

Pick Claude Fable 5.1 for coding: it scores 84.2 on the Vibe Coding Index against 65.7 for Grok 4.6, though on 5 benchmarks against 6.

Pick Grok 4.6 for output tokens 8.3x cheaper ($6.00 vs $50.00 per million) and work measured by LiveBench research or Vending-Bench 2, where it leads.

Model AClaude Fable 5.1Anthropic84.2/1005 independent benchmarksNo cost per solved taskModel BGrok 4.6xAI65.7/1006 independent benchmarks$0.82 per solved task
Shared results
113
Claude Fable 5.1 only
11
Grok 4.6 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 5.1 84.2 from 5 benchmarks, Grok 4.6 65.7 from 6 benchmarks.
Widest category
Math, 27.0 points apart on average over 6 shared benchmarks.
Widest single gap
Time Horizon Index (Vals AI): Claude Fable 5.1 63.3% against Grok 4.6 5.8%, 57.5 points apart on a 0 to 100 scale.
Output price
Claude Fable 5.1 $50.00 against Grok 4.6 $6.00 per million output tokens, 8.3x apart.
Context window
Claude Fable 5.1 takes 1M tokens, Grok 4.6 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 4.6Ties
Coding230
Intelligence20
Agentic work152
Reasoning132
Math60
Knowledge100
Web design90
General310
All shared boards1094
CodingLike-for-likeSix of these boards feed the Vibe Coding Index230
Coding benchmarks for Claude Fable 5.1 and Grok 4.6
BenchmarkClaude Fable 5.1Grok 4.6Leader
LiveBench coding97.7%89.1%Claude Fable 5.1
LMArena WebDev17431617Claude Fable 5.1
AA Coding Index81.676.8Claude Fable 5.1
LiveCodeBench (Vals AI)90.5%88.2%Claude Fable 5.1
SWE-bench Verified (Vals AI)Not measured95.6%Only Grok 4.6 measured
Terminal-Bench 4 (Vals AI)58.1%17.2%Claude Fable 5.1
Vibe Code Bench (Vals AI)90.3%76.2%Claude Fable 5.1
Code migration (Vals AI)54.6%44.6%Claude Fable 5.1
ProgramBench (Vals AI)7.0%1.0%Claude Fable 5.1
IOI (Vals AI)90.8%47.6%Claude Fable 5.1
Terminal-Bench 2.1 (Vals AI)85.0%78.3%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%14.8%Claude Fable 5.1
SkillsBench (Vals AI)61.5%55.8%Claude Fable 5.1
CyberBench (Vals AI)70.4%67.7%Claude Fable 5.1
SciCode63.1%56.5%Claude Fable 5.1
FrontierCode50.9%48.0%Claude Fable 5.1
FrontierSWE56.3%25.3%Claude Fable 5.1
GSO-Bench88.2%Not measuredOnly Claude Fable 5.1 measured
WeirdML92.9%67.3%Claude Fable 5.1
MirrorCode73.3%Not measuredOnly Claude Fable 5.1 measured
ALE-Bench2143.21508.1Claude Fable 5.1
LMArena Text: coding15321466Claude Fable 5.1
LMArena Text: software and IT15301457Claude Fable 5.1
LMArena WebDev: React17921631Claude Fable 5.1
LMArena WebDev: HTML16841597Claude Fable 5.1
LMArena WebDev: from an image17221603Claude 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 4.6
BenchmarkClaude Fable 5.1Grok 4.6Leader
AA Intelligence Index53.444.3Claude Fable 5.1
Epoch Capabilities Index166.5156.6Claude Fable 5.1
Agentic workLike-for-likePublic boards, shown as published, kept out of the index152
Agentic work benchmarks for Claude Fable 5.1 and Grok 4.6
BenchmarkClaude Fable 5.1Grok 4.6Leader
AA Agentic Index57.953.0Claude Fable 5.1
Design Arena: agents building web apps13181248Claude Fable 5.1
Design Arena: agents building full-stack apps13261264Claude Fable 5.1
Design Arena: agents building mobile apps12671234Claude Fable 5.1
Design Arena: agents building Android appsNot measured1291Only Grok 4.6 measured
Design Arena: agents building Godot games13271276Claude Fable 5.1
Design Arena: agents building gamesNot measured1209Only Grok 4.6 measured
Design Arena: HTML slidesNot measured1250Only Grok 4.6 measured
Design Arena: PowerPoint slides13051237Claude Fable 5.1
Design Arena: spreadsheets1380Not measuredOnly Claude Fable 5.1 measured
LiveBench research82.0%84.5%Grok 4.6
LiveBench browser100.0%64.0%Claude Fable 5.1
LiveBench long agentic80.8%40.7%Claude Fable 5.1
SREBench (Vals AI)22.9%Not measuredOnly Claude Fable 5.1 measured
Finance Agent (Vals AI)58.9%53.7%Claude Fable 5.1
Tax Agent Bench (Vals AI)49.2%33.1%Claude Fable 5.1
Legal Research Bench (Vals AI)55.3%48.1%Claude Fable 5.1
Excel Modeling Benchmark (Vals AI)76.7%62.7%Claude Fable 5.1
BioMysteryBench (Vals AI)Not measured72.2%Only Grok 4.6 measured
Terminal-Bench-Science (Vals AI)40.0%11.4%Claude Fable 5.1
Vals Science IndexNot measured38.1%Only Grok 4.6 measured
Time Horizon Index (Vals AI)63.3%5.8%Claude Fable 5.1
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%65.3%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$9,047Grok 4.6
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 index132
Reasoning benchmarks for Claude Fable 5.1 and Grok 4.6
BenchmarkClaude Fable 5.1Grok 4.6Leader
GPQA Diamond93.4%94.7%Grok 4.6
LiveBench reasoning91.7%91.2%Claude Fable 5.1
MysteryMechanism (Vals AI)47.8%30.6%Claude Fable 5.1
MMMU Pro (Vals AI)90.6%Not measuredOnly Claude Fable 5.1 measured
GPQA Diamond (Artificial Analysis run)93.7%94.9%Grok 4.6
Humanity's Last Exam (Artificial Analysis run)59.1%44.1%Claude Fable 5.1
GPQA Diamond (Epoch AI run)Not measured94.0%Only Grok 4.6 measured
ARC-AGI97.5%87.5%Claude Fable 5.1
ARC-AGI-290.0%67.1%Claude Fable 5.1
SimpleBenchNot measured75.9%Only Grok 4.6 measured
Chess puzzles48.0%33.0%Claude Fable 5.1
Mystery game puzzles58.0%34.0%Claude Fable 5.1
EBR-bench57.1%30.5%Claude Fable 5.1
LMArena Text: hard prompts15281448Claude Fable 5.1
LMArena Text: expert15441469Claude Fable 5.1
LMArena Text: hard prompts in English15221445Claude Fable 5.1
LMArena Vision: diagrams13431285Claude Fable 5.1
LMArena Vision: homework13451283Claude 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 4.6
BenchmarkClaude Fable 5.1Grok 4.6Leader
OTIS Mock AIME100.0%99.2%Claude Fable 5.1
FrontierMath, tiers 1 to 390.2%66.0%Claude Fable 5.1
FrontierMath, tier 487.8%31.7%Claude Fable 5.1
ProofBench100.0%51.0%Claude Fable 5.1
LMArena Text: math15311417Claude Fable 5.1
LMArena Text: mathematical work15411464Claude 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 Grok 4.6
BenchmarkClaude Fable 5.1Grok 4.6Leader
MMLU Pro92.4%89.4%Claude Fable 5.1
LegalBench (Vals AI)88.5%86.3%Claude Fable 5.1
CorpFin (Vals AI)Not measured66.2%Only Grok 4.6 measured
TaxEval (Vals AI)76.0%71.1%Claude Fable 5.1
MortgageTax (Vals AI)70.8%64.2%Claude Fable 5.1
MedCode (Vals AI)53.5%44.7%Claude Fable 5.1
SimpleQA Verified70.8%49.3%Claude Fable 5.1
LMArena Text: science15321437Claude Fable 5.1
LMArena Text: medicine and healthcare15311420Claude Fable 5.1
LMArena Text: legal and government15141429Claude Fable 5.1
LMArena Text: business and finance14931416Claude 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 index90
Web design benchmarks for Claude Fable 5.1 and Grok 4.6
BenchmarkClaude Fable 5.1Grok 4.6Leader
Design Arena: websites13121289Claude Fable 5.1
Design Arena: UI components13361294Claude Fable 5.1
Design Arena: game dev13811296Claude Fable 5.1
Design Arena: data viz13441282Claude Fable 5.1
Design Arena: 3D13921277Claude Fable 5.1
Design Arena: all code categories13351292Claude Fable 5.1
Design Arena: SVG13001240Claude Fable 5.1
Design Arena: ASCII art13231279Claude Fable 5.1
LiveBench design83.4%79.8%Claude Fable 5.1
GeneralLike-for-likePublic boards, shown as published, kept out of the index310
General benchmarks for Claude Fable 5.1 and Grok 4.6
BenchmarkClaude Fable 5.1Grok 4.6Leader
LiveBench data analysis80.3%75.3%Claude Fable 5.1
Public Benefits Bench (Vals AI)74.9%66.8%Claude Fable 5.1
SAGE (Vals AI)48.5%28.9%Claude Fable 5.1
MedScribe (Vals AI)91.3%86.5%Claude Fable 5.1
Long context reasoning (AA-LCR)85.3%81.0%Claude Fable 5.1
DTBench97.6%97.3%Claude Fable 5.1
LMCA65.5%48.5%Claude Fable 5.1
Furniture assembly70.0%40.0%Claude Fable 5.1
LMArena Text15121429Claude Fable 5.1
LMArena Text: instruction following15181431Claude Fable 5.1
LMArena Text: creative writing15091426Claude Fable 5.1
LMArena Vision13191263Claude Fable 5.1
LMArena Text: English15061433Claude Fable 5.1
LMArena Text: non-English15081420Claude Fable 5.1
LMArena Text: Chinese15841476Claude Fable 5.1
LMArena Text: German14991426Claude Fable 5.1
LMArena Text: Japanese15621378Claude Fable 5.1
LMArena Text: Korean15171391Claude Fable 5.1
LMArena Text: French15231455Claude Fable 5.1
LMArena Text: Spanish15201414Claude Fable 5.1
LMArena Text: Russian15201421Claude Fable 5.1
LMArena Text: Polish15251430Claude Fable 5.1
LMArena Text: multi-turn14931425Claude Fable 5.1
LMArena Text: longer queries15241456Claude Fable 5.1
LMArena Text: writing and language15101429Claude Fable 5.1
LMArena Text: entertainment and media14971421Claude Fable 5.1
LMArena Vision: English13131270Claude Fable 5.1
LMArena Vision: Chinese13911289Claude Fable 5.1
LMArena Vision: reading text13271272Claude Fable 5.1
LMArena Vision: humor13181270Claude Fable 5.1
LMArena Vision: creative writing13301262Claude Fable 5.1
LMArena DocumentNot measured1452Only Grok 4.6 measured
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 4.6
BenchmarkClaude Fable 5.1Grok 4.6Leader
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 4.6$0.0050Fits in one request

Grok 4.6 costs less

Repository review

50K input + 3K output tokens

Claude Fable 5.1$0.650Fits in one request
Grok 4.6$0.118Fits in one request

Grok 4.6 costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5.1$2.50Fits in one request
Grok 4.6$0.460Fits in one request

Grok 4.6 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 4.6
SpecificationAnthropic Claude Fable 5.1SpaceXAI Grok 4.6
MakerAnthropicxAI
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 1, 2026August 12, 2026
Context window1M500K
Input $/Mtok$10.00$2.00
Output $/Mtok$50.00$6.00
Coding index84.265.7
Independent measurements behind it56
Cost per solved taskNot computable$0.82
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5.1 better than Grok 4.6 for coding?

Pick Claude Fable 5.1 for coding: it scores 84.2 on the Vibe Coding Index against 65.7 for Grok 4.6, though on 5 benchmarks against 6. Pick Grok 4.6 for output tokens 8.3x cheaper ($6.00 vs $50.00 per million) and work measured by LiveBench research or Vending-Bench 2, where it leads.

Which is cheaper, Claude Fable 5.1 or Grok 4.6?

Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens; Grok 4.6 costs $2.00 and $6.00. Cost per solved task is known for Grok 4.6 only.

Which has the bigger context window, Claude Fable 5.1 or Grok 4.6?

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

How many benchmarks is the Claude Fable 5.1 vs Grok 4.6 comparison based on?

113 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 Grok 4.6's on 6. Where only one model has a result, the page says so instead of naming a winner.

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