Anthropic releases Claude Fable 5, which can generate video games and complex tools from a single prompt

Anthropic has released Claude Fable 5, described as the first publicly available version of its Mythos model. AI researcher Ethan Mollick tested the model and reported it 'outperformed basically every other public model I have used by a considerable margin,' working for up to a dozen hours executing on multi-page specifications.

Mollick used Fable to create multiple video games via Claude Code—including Snake (an arcade-style game where a moving serpent eats apples), Strata (a subterranean tunnel exploration game), and Duino (a game based on Rainer Maria Rilke's poetry cycle)—all generated from a single initial prompt for each.

Beyond games, Mollick also used Fable to create an isochronic map, a visualization showing travel time between locations. The article notes that 'software projects that once required entire teams — games, mapping tools, highly complex specifications — are now being spun up from a single prompt.'