Claude Fable 5 vs Grok 4.20
The comparison
On LM Arena, Claude Fable 5 scores higher (1508 Elo vs 1474 Elo), from a smaller review base (4,297 vs 42,370 Arena votes).
As of Jun 24, 2026, Claude Fable 5 is rated 1508 Elo on LM Arena (4,297 Arena votes); Grok 4.20 is rated 1474 Elo on LM Arena (42,370 Arena votes). No source is blended; each stands on its own.
Claude Fable 5
1508 EloLM Arenahigher
4,297Arena votes
Grok 4.20
1474 EloLM Arena
42,370Arena voteslarger base