Claude Fable 5 vs Grok 4.20
The comparison
On LM Arena, Claude Fable 5 scores higher (1508 Elo vs 1472 Elo), from a smaller review base (15,817 vs 61,762 Arena votes).
As of Jul 27, 2026, Claude Fable 5 is rated 1508 Elo on LM Arena (15,817 Arena votes); Grok 4.20 is rated 1472 Elo on LM Arena (61,762 Arena votes). No source is blended; each stands on its own.
Claude Fable 5
1508 EloLM Arenahigher
15,817Arena votes
Grok 4.20
1472 EloLM Arena
61,762Arena voteslarger base