Noometry

Model comparison

Claude Fable 5.1 vs Grok 4.7

Claude Fable 5.1 is the stronger model overall, scoring 68.5 to 46.6 on the Noometry Index. Grok 4.7 costs 6.7× less per token, which makes it the better buy when Claude Fable 5.1's lead doesn't matter for your workload.

Last verified . 21 shared benchmarks.

Claude Fable 5.1 Anthropic

68.5

Rank #2 Confirmed

Grok 4.7 xAI

46.6

Rank #56 Confirmed

Summary

  • They share 21 benchmarks with published results for both. Claude Fable 5.1 scores higher in 9 categories and Grok 4.7 in 0 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Fable 5.1 leads 89.5 to 41.1.
  • The biggest single-benchmark swing is ProofBench: 100% for Claude Fable 5.1 and 34% for Grok 4.7.
  • Grok 4.7 is cheaper at $2 / $6 per million input/output tokens, against $10 / $50 for Claude Fable 5.1.
  • Claude Fable 5.1 accepts more context: 1M tokens versus 500K.

Side by side

Claude Fable 5.1Grok 4.7
ProviderAnthropicxAI
Noometry Index68.546.6
Released2026-09-012026-09-21
WeightsProprietaryProprietary
Context window1M500K
Max output128K500K
Input $ / M tokens$10$2
Output $ / M tokens$50$6
Results tracked5021

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Category by category

Coding Claude Fable 5.1 leads

Claude Fable 5.1: 70.5 (#2), Grok 4.7: 55.0 (#23)

BenchmarkClaude Fable 5.1Grok 4.7
CursorBench51.8%46.3%
LMArena WebDev17531636
FrontierSWE56.3%29.5%
SciCode63.1%57.4%
LMArena Coding15231423
FrontierCode50.9%—
WeirdML92.9%—
MirrorCode73.3%—
ALE-Bench2,143—

Agentic & Tool Use Not comparable

Claude Fable 5.1: 50.8 (#5), Grok 4.7: —

BenchmarkClaude Fable 5.1Grok 4.7
APEX-Agents68.6%—
Remote Labor Index17.9%—
GDP.pdf29.6%—
Vending-Bench 25,422—

Reasoning Claude Fable 5.1 leads

Claude Fable 5.1: 76.7 (#5), Grok 4.7: 40.1 (#49)

BenchmarkClaude Fable 5.1Grok 4.7
NYT Connections (extended)90%76.8%
CritPt31.1%17.7%
LMArena Hard Prompts15261409
ARC-AGI-290%—
ARC-AGI-197.5%—
Chess Puzzles47%—
EBR-Bench57.1%—
Mystery Game Puzzles58%—
DTBench97.6%—
LMCA65.5%—
Epoch Capabilities Index165—

Math Claude Fable 5.1 leads

Claude Fable 5.1: 89.5 (#3), Grok 4.7: 41.1 (#73)

BenchmarkClaude Fable 5.1Grok 4.7
ProofBench100%34%
LMArena Math15191393
FrontierMath (Tiers 1-3)90.2%—
FrontierMath Tier 487.8%—
OTIS Mock AIME 2024-2025100%—
FrontierMath Erdős0%—

Knowledge Claude Fable 5.1 leads

Claude Fable 5.1: 69.3 (#5), Grok 4.7: 38.7 (#130)

BenchmarkClaude Fable 5.1Grok 4.7
LMArena Expert15281413
Humanity's Last Exam46.5%—
SimpleQA Verified70.8%—

Multimodal Claude Fable 5.1 leads

Claude Fable 5.1: 54.1 (#4), Grok 4.7: 28.8 (#107)

BenchmarkClaude Fable 5.1Grok 4.7
Furniture Assembly70%20.8%
LMArena Vision1319—
Blueprint-Bench 241.9%—
LMArena Document1513—

Multilingual Claude Fable 5.1 leads

Claude Fable 5.1: 59.5 (#2), Grok 4.7: 51.2 (#108)

BenchmarkClaude Fable 5.1Grok 4.7
LMArena Non-English15091392
LMArena Chinese15891476
LMArena Russian15251396
LMArena French1532—
LMArena German1495—
LMArena Japanese1565—
LMArena Spanish1503—

Instruction Following Claude Fable 5.1 leads

Claude Fable 5.1: 79.3 (#6), Grok 4.7: 74.3 (#98)

BenchmarkClaude Fable 5.1Grok 4.7
LMArena Instruction Following15151406

Long Context Claude Fable 5.1 leads

Claude Fable 5.1: 46.8 (#19), Grok 4.7: 43.2 (#97)

BenchmarkClaude Fable 5.1Grok 4.7
LMArena Longer Query15241416

Writing & Preference Claude Fable 5.1 leads

Claude Fable 5.1: 79.3 (#1), Grok 4.7: 70.1 (#23)

BenchmarkClaude Fable 5.1Grok 4.7
LMArena Text15111397
LMArena Creative Writing15071391
EQ-Bench Creative Writing21622007
LMArena Multi-Turn14921389

Frequently asked questions

Is Claude Fable 5.1 better than Grok 4.7?

Claude Fable 5.1 is the stronger model overall, scoring 68.5 to 46.6 on the Noometry Index. Grok 4.7 costs 6.7× less per token, which makes it the better buy when Claude Fable 5.1's lead doesn't matter for your workload.

Which is cheaper, Claude Fable 5.1 or Grok 4.7?

Grok 4.7 is cheaper. It lists at $2 per million input tokens and $6 per million output tokens; Claude Fable 5.1 lists at $10 and $50.

Is Claude Fable 5.1 or Grok 4.7 better for coding?

Claude Fable 5.1 scores higher on coding benchmarks: 70.5 versus 55.0 in the Noometry coding category.

Which has the bigger context window?

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

How many benchmarks do Claude Fable 5.1 and Grok 4.7 share?

21 benchmarks have published results for both models. Claude Fable 5.1 has 50 scored results on Noometry and Grok 4.7 has 21.

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