Claude Fable 5.1 Reportedly Builds a Playable Minecraft Clone from One Prompt

A reported demonstration shows a developer using Claude Fable 5.1 and Three.js to create a playable Minecraft-style clone from a single prompt, highlighting the model’s push toward longer-running, autonomous software projects. Anthropic introduced Claude Fable 5.1 on September 1, 2026, describing it as its most capable generally available model for coding and knowledge work. The company says the model can work across entire codebases, write tests, use vision to check outputs, recover when tools fail, and continue unattended for hours. Its product page lists coding, browser operation, research, and multi-application workflows among its intended uses (Anthropic).