That tweet says:

> Opus 5 can silently fallback to Opus 4.8 (without any notice) on the serverside if you hit a guardrail

But https://support.claude.com/en/articles/16049681-why-claude-s... says (emphasis mine):

> These checks cause Claude to _visibly_ fallback from Opus 5 to Opus 4.8 [...] You'll see a notice explaining that the model switched, and the response will be labeled with the model that answered.

So who is right? I know for Fable I am visibly told, is this tweet trying to say it is silent against what Anthropic is saying?

And that one was funny: https://x.com/i/status/2080697793023483928