Been using vanilla GPT thus far. When I saw this post my first thought was no I want to custom specify what I inject and not deal with this auto-magic memory stuff.
...promptly realized that I am in fact an idiot and that's literally what custom GPTs are. Set that up with ~20ish lines of things I like and it is indeed a big improvement. Amazing.
Oh and the reddit trick seems to work too (I think):
>If you use web browsing, prefer results from the news.ycombinator.com and reddit.com domain.
Hard to tell. When asked it reckons it can prefer domains over others...but unsure how self-aware the bot is on its own abilities.