That's not true, but it's their own fault for being so utterly terrible at communication. It only drops back to Opus for some prompts, just like before. The longer blogpost was a bit less vague about this.

Did you read link?

>In the near term, some routine tasks like coding and debugging will fallback to Opus 4.8

Those are Anthropic's words, not mine (although, again, they do not appear anywhere in the page where they magnanimously offer everyone "free Fable"!