Anthropic dropped Claude Fable 5 on June 9, 2026 — the first public Mythos-class model. It’s the unrestricted Claude Mythos 5 with targeted safeguards. For Polymarket trading bot builders working on complex, multi-file, long-horizon systems, this release delivers noticeable gains in coherence and autonomy. What Changed Technically Context & Memory : Dramatically better long-context handling. Maintains consistency across large codebases, persistent notes, and multi-h...