Yup, and I had seen it in the Opus 4.5 soul document as well: https://gist.github.com/Richard-Weiss/efe157692991535403bd7e...

In the future, I expect different models from different firms behaving differently will become as obviously normal as different humans behaving differently. Those of us that have used agents a lot have already noticed this, but the general public still seems to consider AI to be plug-and-play.

The Opus 4.8 infatuation with being honest genuinely drove me nuts (honest take). The constant need for me to decipher and decide on something after its final message was tiring too.

GPT-5.6-Sol is refreshing that its replies start with "understood." instead of flattering me for my steering prompt. Now ... after a few weeks, will I get suck of "understood"? I dunno :)