... plans multi-step tasks, calls tools, checks its own output, and keeps going without hand-holding. Demos include autonomously playing Factorio and building a working CAD editor (with its own AI copilot inside). Coding: 80.3% on SWE-Bench Pro vs 69.2% for Opus 4.8. Knowledge work: top scores on GDPval-AA, ahead of Opus, GPT-5.5 and Gemini 3.1 Pro. Long context + vision: noticeably stronger on long documents and multi-turn work. The interesting twist: it ships with hard guardrails ... ... used Fable on effort level high, will need more testing with higher thinking levels. But already burning hard through token budgets. Comment from Geert Zaal(@geert_zaal): working on my first few tests with Fable on both MetaScope and Armature