This feels more like mythology though.

Claude and GPT tell me all the time what they are confident and what they're not confident in. This is partially useful, but it's not a guarantee of anything, since they can be confidently wrong or unsure and correct.

Same with Jav.

Arguing that Jav in some way more useful than current LLMs because it includes a confidence score smells of someone who hasn't updated their priors since GPT-4/4o and it's particular issues.

Jav is cool because it's very fast, very cheap, and "good enough". That's it.