Yes I was interested in that too. It suggests that in writing our own guidance for we should follow a similar style, but I rarely if ever see people doing that. Most people still stick to "You" or abstract voice "There is ..." "Never do ..." etc.

It must be that they are training very deeply the sense of identity in to the model as Claude. Which makes me wonder how it then works when it is asked to assume a different identity - "You are Bob, a plumber who specialises in advising design of water systems for hospitals". Now what? Is it confused? Is it still going to think all the verbiage about what "Claude" does applies?

“Claude” is more specific than “you”. Why rely on attention to figure out who’s the subject? Also it is in their (people from Anthropic) believe that rule based alignment won’t work and that’s why they wrote the soul document as “something like you’d write to your child to show them how they should behave in the world” (I paraphrase). I guess system prompt should be similar in this aspect.

That’s because Anthropic does not consider their model as having personality but rather that it simulates the experience of an abstract entity named Claude.