Noometry

Model comparison

Claude Fable 5.1 vs Grok 4.1

Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 41.5 on the Noometry Index.

Last verified . 18 shared benchmarks.

Claude Fable 5.1 Anthropic

69.0

Rank #2 Confirmed

Grok 4.1 xAI

41.5

Rank #134 Confirmed

Summary

  • They share 18 benchmarks with published results for both. Claude Fable 5.1 scores higher in 9 categories and Grok 4.1 in 0 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Fable 5.1 leads 89.6 to 38.9.

Side by side

Claude Fable 5.1Grok 4.1
ProviderAnthropicxAI
Noometry Index69.041.5
Released2026-09-012025-11-17
WeightsProprietaryProprietary
Context window1M—
Max output128K—
Input $ / M tokens$10—
Output $ / M tokens$50—
Results tracked5219

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Category by category

Coding Claude Fable 5.1 leads

Claude Fable 5.1: 74.7 (#1), Grok 4.1: 33.7 (#253)

BenchmarkClaude Fable 5.1Grok 4.1
LMArena WebDev17441214
LMArena Coding15281445
FrontierCode50.9%—
CursorBench51.8%—
FrontierSWE56.3%—
SciCode63.1%—
GSO88.2%—
WeirdML92.9%—
MirrorCode73.3%—
ALE-Bench2,143—

Agentic & Tool Use Claude Fable 5.1 leads

Claude Fable 5.1: 50.7 (#5), Grok 4.1: 34.1 (#49)

BenchmarkClaude Fable 5.1Grok 4.1
APEX-Agents68.6%—
Remote Labor Index17.9%—
Cybench—39%
GDP.pdf29.6%—
Vending-Bench 25,422—

Reasoning Claude Fable 5.1 leads

Claude Fable 5.1: 76.7 (#7), Grok 4.1: 29.5 (#91)

BenchmarkClaude Fable 5.1Grok 4.1
LMArena Hard Prompts15261435
ARC-AGI-290%—
NYT Connections (extended)90%—
ARC-AGI-197.5%—
CritPt31.1%—
Chess Puzzles47%—
EBR-Bench57.1%—
Mystery Game Puzzles58%—
DTBench97.6%—
LMCA65.5%—
Epoch Capabilities Index164.7—

Math Claude Fable 5.1 leads

Claude Fable 5.1: 89.6 (#4), Grok 4.1: 38.9 (#120)

BenchmarkClaude Fable 5.1Grok 4.1
LMArena Math15251422
FrontierMath (Tiers 1-3)90.2%—
FrontierMath Tier 487.8%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
FrontierMath Erdős0%—

Knowledge Claude Fable 5.1 leads

Claude Fable 5.1: 69.6 (#6), Grok 4.1: 39.5 (#133)

BenchmarkClaude Fable 5.1Grok 4.1
LMArena Expert15351417
Humanity's Last Exam46.5%—
SimpleQA Verified70.8%—

Multimodal Not comparable

Claude Fable 5.1: 53.9 (#4), Grok 4.1: —

BenchmarkClaude Fable 5.1Grok 4.1
LMArena Vision1318—
Blueprint-Bench 241.9%—
Furniture Assembly70%—
LMArena Document1513—

Multilingual Claude Fable 5.1 leads

Claude Fable 5.1: 59.1 (#3), Grok 4.1: 53.4 (#68)

BenchmarkClaude Fable 5.1Grok 4.1
LMArena Non-English15071425
LMArena Chinese15861465
LMArena French15251448
LMArena German15001446
LMArena Japanese15431397
LMArena Korean15341407
LMArena Russian15211434
LMArena Spanish15161438

Instruction Following Claude Fable 5.1 leads

Claude Fable 5.1: 79.2 (#6), Grok 4.1: 73.8 (#111)

BenchmarkClaude Fable 5.1Grok 4.1
LMArena Instruction Following15171400

Long Context Claude Fable 5.1 leads

Claude Fable 5.1: 46.7 (#20), Grok 4.1: 43.2 (#100)

BenchmarkClaude Fable 5.1Grok 4.1
LMArena Longer Query15221416

Writing & Preference Claude Fable 5.1 leads

Claude Fable 5.1: 79.2 (#2), Grok 4.1: 62.4 (#75)

BenchmarkClaude Fable 5.1Grok 4.1
LMArena Text15101437
LMArena Creative Writing15071411
LMArena Multi-Turn14921437
EQ-Bench Creative Writing2162—

Frequently asked questions

Is Claude Fable 5.1 better than Grok 4.1?

Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 41.5 on the Noometry Index.

Is Claude Fable 5.1 or Grok 4.1 better for coding?

Claude Fable 5.1 scores higher on coding benchmarks: 74.7 versus 33.7 in the Noometry coding category.

How many benchmarks do Claude Fable 5.1 and Grok 4.1 share?

18 benchmarks have published results for both models. Claude Fable 5.1 has 52 scored results on Noometry and Grok 4.1 has 19.

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