I'm going to take your comment as a request for supporting details.

I believe what I wrote is an accurate summary of information in a report published this month by Anthropic. I haven't seen the report, but have seen this next summary written by someone who I trust to summarize accurately: https://thezvi.substack.com/p/the-bad-guy-with-an-ai-named-c...

OpenAI reported similar behavior last year. The assertion that the other (two) leading US models are being distilled in a similar manner is an assumption on my part. Where I wrote, "Claude or another leading US model" I initially had just "Claude", but it felt silly to imply that the same thing is not happening to the other leading US models.