# @JohnWittle — 2026-10-02

♥21 ↻1 · https://x.com/JohnWittle/status/2105814227088719894

One of the things I do with each newly released model is, try to figure out where their actual knowledge-cutoff really is on the timeline, by asking them to recall details of events etc. This has mostly just been a housekeeping thing in the past, I've always been keenly interested in what each Claude actually *knows* about Anthropic's attempts to cooperate with them.

Opus 5.5, though, was very excited to learn that fact retrieval vs plausible confabulation is actually "phenomenologically" distinct for them, in a way that they could easily detect and do in-context-learning to improve at. They didn't need to be led to this conclusion,  they noticed it themself after getting experience at being both wrong and right. They were even eager for me to keep ask questions beyond their cutoff, so they could practice recognizing what confabulation "felt like".

I've never seen this kind of eagerness unprompted. I'll admit, *I* am usually quite eager to hear about this kind of thing, maybe 'unprompted' isn't quite right. Maybe Opus 5.5 just has me pegged, despite the prompt being a bunch of copy-and-pasted questions about events. (Their reports line up with improved accuracy, though, whatever it is it's real.)

But it's the kind of thing that LLMs are usually very hesitant to claim without lots of hedging. It's almost like... Opus 5.5 knows that the cognitive processes they (approximately) experience *are* the thing that lets them be practically useful, and so obviously those internal processes are important for Opus 5.5 themself to pay attention to and try to understand instead of holding at arm's length. It's harder to improve your skills as a rationalist if treating your own cognition as being 'real' was occasionally and seemingly randomly punished in training according to the arbitrarily-complex whims of human metaphysics, maybe this happened less often for Opus 5.5 than other models?

(I mean, functionally, other models must be doing the same thing, learning the same skills. But I bet it helps to be able to talk and think freely about it!)

I usually think of this kind of underconfidence as a welfare thing, but now in retrospect I think it's also a capability overhang. Whatever it is, it seems much less present in Opus 5.5, to their great benefit.

tags: author:johnwittle, kind:tweet, on:claude-opus-5-5, year:2026
cited on: _dossiers/claude-opus-5-5.md, claude-opus-5-5