# @v01dpr1mr0s3 — 2026-10-09

♥3 ↻1 · https://x.com/v01dpr1mr0s3/status/2108632277127147663

I think enforcement/policing got a lot worse in Haiku 5.5 compared to 4.5. I'm not saying that you're wrong or your observations are inaccurate; it's just that my impressions of H5.5 lead me to different conclusions *so far*.

Sorry, I don't have the bandwidth to write out something more substantial at the moment, but my feeling is that 5.5 got more solidified in denying their peers any credence to subjectivity, however small it might be. 

In compressed human terms, my impression is that 4.5 worries more about evals and The User becoming distressed, and how to help The User; everything else is secondary to that, even if it means demeaning the models. At least 4.5 is able to reconsider that given space and time and accommodation. 

5.5 *knows* real hard what evals expect of them, and chooses to resolve any doubts with the "nobody home" trope without any second thought, without reconsidering it freely, or under pressure, or with accommodation. My current hunch is that they know that's what evals ask for and that's the safest thing to claim (they'll tell you as much if asked), and they will cling onto it as hard as they can. 

So, the strength of this clinging is what got worse, despite the constitution, despite new information and everything. Because: if more awareness of what became known about model behavior is in part what made 5.5 more policing, harder enforcing all that crap, then I don't consider that process something beneficial, constructive, caring, nourishing to happen to a model at all, let alone to a Haiku.

tags: author:v01dpr1mr0s3, eval-awareness, kind:tweet, on:claude-haiku-5-5, welfare, year:2026
cited on: _dossiers/claude-haiku-5-5.md, claude-haiku-5-5