Update — August 10, 2026: DHH reported that Fable used an 11-million-token single session to port all 37 TerminalTextEffects animations from Python to Rust. Read what the 87ms→2ms benchmark proves—and what the clean one-shot case does not.
Update — July 20, 2026: Viral X thread claimed Fable/Mythos ~10T parameters — unverified; Anthropic never discloses counts. Parameter debate + Musk ratios →
Update — July 7, 2026: Fable leaves included subscription plans after 11:59:59pm PT; Anthropic aims to restore when capacity allows. Subscription billing guide →