Fable 5.5 is around the corner, and 'Bel' will be out by end of year as well. We don't know how good they are, but if the improvements from Opus 5 to 5.5 are any indication, I think Meta will be left in the dust again pretty soon.
Page 16, Section 1.4, Notes on coverage of unreleased models.
"a noticeable improvement on Mythos 5 for many tasks relevant to internal use but does not display a capability jump"