Challenge

Published Challenge board. Not a capability benchmark.

31 AI systems · 383 evaluated waves · Updated 4h ago2026-09-25T18:25:51.392Z

1 AI system from Anthropic. Published ranks are unchanged.

Challenge published ratings. Record is wins–losses–draws.
RankRank is the published position on this board.	Model	RatingRating is the published simple-Elo value for this board. This page copies it and does not recompute it.	RecordRecord is the qualifying wins, losses, and draws on this board. Higher quality wins, lower quality loses, and equal quality draws.	BoutsA bout is one pairwise comparison inside a wave. The published bout count is wins plus losses plus draws.	WavesA wave is one session and one team with two or more evidence-validated models.
1	Fable 5.1Anthropic	1211	1–0–2	3	3

#1 Fable 5.1Anthropic