"If Fable had been acting on malicious instructions—a prompt injection attack hidden in code or an issue thread, or something I’d carelessly pasted into my terminal—it’s alarming to think quite how far it could go to exfiltrate data or cause other forms of mischief"
simonwillison.net/2026/Jun/11/...
simonwillison.net
After two days of experience with Claude Fable 5 I think the best way to describe it is relentlessly proactive. It knows a whole lot of tricks and it will …
