The assumption was actually that Fable 5.1 and Opus 5.1 were supposed to be released yesterday. It seems to be delayed until next week. However, it appears that some people already have access to the new models.
There also seems like there might be a new Opus 5.1 (?) model You can use these prompts below to verify if you have access: - when exactly did claude opus 4.6 r...