I suppose it's an improvement, but it doesn't make the model any more useful. Anthropic are now being quite explicit that they'll choose what you can and can't use their models for, and most importantly that's not limited to any safety concerns - it includes not allowing you to work on AI (and anything else Anthropic may choose to work on).

What's interesting is they say they'll change this to an explicit refusal in a few days, which seems too fast for them to retrain Fable/Mythos itself, so implies that this was always a filter in front of the model, and judging by how crude their "safety" filter is, this "might compete with us" filter is not going to be any better.

I also wonder who's paying for the tokens consumed by the filter (presumably also an LLM) - is that now factored into the input tokens cost? Hopefully(?) it is an LLM not just a regex like Claude Code's "sentiment" (swear) detector.