> Fable was used in several iterations to test for security issues before each release.

How? The point of Fable (vs. Mythos) is that it has extreme guardrails against doing e. g. security work, even mentioning "security" or "vulnerability" in the prompt will shut it down.

Just opened Claude Code and I don't see any such restrictions. Asked Fable to do security/vulnerability review on the code base and it gladly agreed.

I can't speak for the above-mentioned project though, because I wasn't part of that release.