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Does this imply that Mythos should have been mentioned in Anthropic's February Risk Report? That report was released together with RSP v3, i.e. on Feb 24th, if I'm not mistaken. The RSP says in Section 3.1:
Scope. A Risk Report will cover all publicly deployed models at the time of its publication. It will also cover internally deployed models when we determine that these models could pose significant risks above and beyond those posed by our public models.
It seems quite clear that Mythos poses significant risks above those posed by Opus 4.6, though I guess one can argue that this wasn't clear yet when it was first deployed for internal use.