Noometry

Model comparison

Claude Fable 5 vs Grok-3 mini

Claude Fable 5 is the stronger model overall, scoring 66.8 to 41.2 on the Noometry Index.

Last verified . 24 shared benchmarks.

Claude Fable 5 Anthropic

66.8

Rank #5 Confirmed

Grok-3 mini xAI

41.2

Rank #141 Confirmed

Summary

  • They share 24 benchmarks with published results for both. Claude Fable 5 scores higher in 8 categories and Grok-3 mini in 0 categories; 7 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Fable 5 leads 76.8 to 13.6.
  • The biggest single-benchmark swing is ARC-AGI-2: 89.2% for Claude Fable 5 and 0.4% for Grok-3 mini.

Side by side

Claude Fable 5Grok-3 mini
ProviderAnthropicxAI
Noometry Index66.841.2
Released2026-06-072025-04-09
WeightsProprietaryProprietary
Context window1M—
Max output128K—
Input $ / M tokens$10—
Output $ / M tokens$50—
Results tracked6235

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Category by category

Coding Claude Fable 5 leads

Claude Fable 5: 70.6 (#4), Grok-3 mini: 40.8 (#131)

BenchmarkClaude Fable 5Grok-3 mini
WeirdML91.9%42.6%
LMArena Coding15191379
DeepSWE69.9%—
FrontierCode53.5%—
Aider Polyglot—49.3%
LMArena WebDev1625—
FrontierSWE47%—
SciCode61%—
GSO78.4%—
MirrorCode63.9%—
ALE-Bench2,041—

Agentic & Tool Use Not comparable

Claude Fable 5: 54.0 (#2), Grok-3 mini: —

BenchmarkClaude Fable 5Grok-3 mini
APEX-Agents63.6%—
Remote Labor Index16.1%—
τ²-bench Banking39.7%—
PostTrainBench41.8%—
GBAEval74.5%—
GDP.pdf30%—
LMArena Search1230—
Vending-Bench 25,680—

Reasoning Claude Fable 5 leads

Claude Fable 5: 76.8 (#6), Grok-3 mini: 13.6 (#334)

BenchmarkClaude Fable 5Grok-3 mini
ARC-AGI-289.2%0.4%
Kagi LLM Benchmark91.4%61.3%
ARC-AGI-198.5%16.5%
LMArena Hard Prompts15081375
Epoch Capabilities Index162.06140.35
SimpleBench81.9%—
NYT Connections (extended)92.7%—
CritPt28.6%—
Chess Puzzles41%—
EnigmaEval39.3%—
EBR-Bench39.5%—
Mystery Game Puzzles52%—
DTBench98.4%—
LMCA61.1%—
Surface Evolver Bench95%—
Bench to the Future 30.13—

Math Claude Fable 5 leads

Claude Fable 5: 88.5 (#5), Grok-3 mini: 42.1 (#85)

BenchmarkClaude Fable 5Grok-3 mini
OTIS Mock AIME 2024-2025100%77.8%
LMArena Math15191386
FrontierMath (Tiers 1-3)87%—
FrontierMath Tier 490.2%—
ProofBench95%—
Omni-MATH—31.8%
MATH Level 5—90.9%
FrontierMath (Feb 2025 set)—5.9%
FrontierMath Erdős0%—

Knowledge Claude Fable 5 leads

Claude Fable 5: 62.2 (#25), Grok-3 mini: 46.4 (#81)

BenchmarkClaude Fable 5Grok-3 mini
GPQA Diamond85.9%76.3%
LMArena Expert15341395
SimpleQA Verified70.7%—
MMLU-Pro—79.9%
Confabulations—10.8%
GPQA (HELM)—67.5%

Multimodal Not comparable

Claude Fable 5: 45.3 (#17), Grok-3 mini: —

BenchmarkClaude Fable 5Grok-3 mini
LMArena Vision1324—
Blueprint-Bench 238.6%—
Furniture Assembly35.8%—
LMArena Document1496—

Multilingual Claude Fable 5 leads

Claude Fable 5: 57.3 (#9), Grok-3 mini: 48.1 (#145)

BenchmarkClaude Fable 5Grok-3 mini
LMArena Non-English14811352
LMArena Chinese15431387
LMArena French15051357
LMArena German14861349
LMArena Japanese15061342
LMArena Korean14881335
LMArena Russian15041353
LMArena Spanish14981381

Instruction Following Too close to call

Claude Fable 5: 78.6 (#8), Grok-3 mini: 78.5 (#9)

BenchmarkClaude Fable 5Grok-3 mini
LMArena Instruction Following15021357
IFEval—95.1%

Long Context Claude Fable 5 leads

Claude Fable 5: 46.3 (#23), Grok-3 mini: 41.0 (#147)

BenchmarkClaude Fable 5Grok-3 mini
LMArena Longer Query15091372
Fiction.LiveBench—66.7%

Writing & Preference Claude Fable 5 leads

Claude Fable 5: 75.9 (#5), Grok-3 mini: 52.5 (#169)

BenchmarkClaude Fable 5Grok-3 mini
LMArena Text14911370
LMArena Creative Writing14941342
LMArena Multi-Turn15041355
Short-Story Creative Writing—73.5%
EQ-Bench Creative Writing1943—
WildBench—65.1%
EQ-Bench 41340—

Frequently asked questions

Is Claude Fable 5 better than Grok-3 mini?

Claude Fable 5 is the stronger model overall, scoring 66.8 to 41.2 on the Noometry Index.

Is Claude Fable 5 or Grok-3 mini better for coding?

Claude Fable 5 scores higher on coding benchmarks: 70.6 versus 40.8 in the Noometry coding category.

How many benchmarks do Claude Fable 5 and Grok-3 mini share?

24 benchmarks have published results for both models. Claude Fable 5 has 62 scored results on Noometry and Grok-3 mini has 35.

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