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brianletort.aiD. Brian Letort, Ph.D.

AI Market · Forecast desk · hit · software

74% · hit

Artificial Analysis publishes an Opus 5 Intelligence Index result within three points of Claude Fable 5 by August 15, 2026.

Back to the bookIssue 2026-W30Evidence ↗

Outcome

hitcalled at 74%resolved September 1, 2026brier contribution 0.068

Artificial Analysis v4.1.1 (Aug 6) scored Claude Opus 5 (max) at 63 and Claude Fable 5 at 62 — a one-point gap, inside the three-point bar — before the Aug 15 deadline.

Evidence: https://artificialanalysis.ai/models/comparisons/claude-opus-5-xhigh-vs-claude-fable-5