Factory AI is announcing that Claude Fable 5, Anthropic's newly launched Mythos-class model, is now live inside Droid, its autonomous software engineering platform. The integration is the result of a direct partnership with Anthropic, making Factory one of the first platforms to ship Fable 5 to engineering teams on day one of the model's public availability.
What Droid Actually Does
Factory's platform lets engineers delegate entire engineering tasks to AI agents called Droids, taking work from project management tickets all the way to mergeable pull requests, while engineers stay in the "outer loop" handling requirements, architecture, and customer feedback. Unlike consumer-facing coding assistants, Factory has built its reputation on what founders Matan Grinberg and Eno Reyes call "agent-native development" -- an approach that replaces line-by-line coding with parallel, self-directed software agents.
Today, Droids are used daily by hundreds of thousands of developers across enterprises including Nvidia, Adobe, EY, Palo Alto Networks, and Adyen. Their approach focuses on enterprise customers with legacy codebases, achieving results like reducing 4-month migration projects to 3.5 days. The bet has been paying off: for each of the past six months, Factory has doubled revenue month over month.
Why Fable 5 Changes the Equation
The key word in Factory's announcement is ambiguity. Most coding agents perform well on tightly scoped, well-defined tasks. What Factory is claiming with Fable 5 is something different: a model that holds up when the work gets messy, sprawling, and open-ended. According to Factory's early testing, Fable 5 in Droid is:
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