Fetching from the wire…
01
02
03
04
05
06
07
08
Research2026-06-15 · source-backed
On June 12 Epoch released FrontierMath v2, which corrected errors in 42% of problems; the set is now 338 problems (295 in Tiers 1–3, 43 in the Tier-4 expansion) (Epoch AI). Claude Fable 5 took the top spot at 87% on Tiers 1–3 and 88% on Tier 4. If you've been citing FrontierMath numbers for eval or vendor comparison, re-baseline against v2. Almost half the problems changed. Old leaderboard comparisons are now apples to a different fruit.
Each link below shares sources, entities, or timing with this story.
Anthropic released Fable / Shared entities / Shared topic / What happened next / Tension
Linked by a graph relationship (Anthropic released Fable); both cover Claude Fable, Fable; overlapping topics (claude, fable).
Anthropic released Fable / Shared entities / Shared topic / What happened next
Linked by a graph relationship (Anthropic released Fable); both cover Claude Fable, Fable; overlapping topics (claude, different, fable).
Linked by a graph relationship (Anthropic released Fable); both cover Claude Fable, Fable; overlapping topics (claude, fable).
Linked by a graph relationship (Anthropic released Fable); both cover Claude Fable, Fable; overlapping topics (claude, fable).
Linked by a graph relationship (Anthropic released Fable); both cover Claude Fable, Fable; overlapping topics (claude, fable).
Anthropic released Fable / Shared entity: Fable / Shared topic / What happened next / Tension
Linked by a graph relationship (Anthropic released Fable); both cover Fable; overlapping topics (against, claude, fable).
Simon Willison uses Fable / Shared entities / Shared topic / Earlier coverage
Linked by a graph relationship (Simon Willison uses Fable); both cover Claude Fable, Fable; overlapping topics (claude, fable).
Simon Willison uses Fable / Shared entity: Fable / Shared topic / What happened next
Linked by a graph relationship (Simon Willison uses Fable); both cover Fable; overlapping topics (against, claude, different, fable).