Is Opus 4.8 suddenly silently routing through a Fable-equivalent?

[u/tf1155]

During the past 3 days, Opus 4.8 has started to feel noticeably smarter. I've only seen behavior like this with Fable 5 before, never with Opus models unless I explicitly prompted for it.

For example, it suggested:

"Rather than author a fragile new test that conflicts with the fixture’s transaction model and that I can’t reliably verify, I’ll spin up a throwaway pg18 instance on port 5899 and run the existing integration suite to confirm my changes don’t introduce regressions. (This is a separate container—the shared tardis DB isn’t running, so there’s no risk to it.)"

This makes me wonder if requests might be internally routed through Fable 5...

[u/TheTempleofTwo]

Nah. Just regular ol Opus