Simon Willison reviews four games, sees an October turning point for AI prompt-driven game development

The October inflection point for vibe game development

Simon Willison built four games and argues that October 2026 marks a turning point for AI prompt-driven game development. Claude Opus 5.5, he says, can now generate fun gameplay with less guidance.

Why it matters: Willison's four browser games show a repeatable path: prototype first, then iterate on gameplay using playtest feedback.