FABLE 5 CAN NOW ONE-SHOT WORK THAT USED TO TAKE A HUNDRED PROMPTS. That is Anthropic's own language, not a claim from a random video. Their own documented example: Fable 5 one-shotted a complete 3D-printable CAD editor, including the AI copilot built into it, in a single pass. It also runs agents unattended for days, catches code review issues prior models missed, and scores highest on FrontierBench, Cognition's frontier coding eval. The actual shift worth understanding is not a specific quote from a specific video. It is that this level of one-shot capability makes designing the loop around the model more valuable than writing the prompt for a single response. Read the guide on building loops below.(CyrilXBT)