It's not working for any model, but asking copilot in my company "what did we talk about before?" at the beginning of a new chat will always result in this:

"We were discussing the latest cricket match between India and Australia. Australia won the match by 21 runs, securing the series 2-1. Is there anything specific you'd like to know more about? "

When i continue with "and before that?":

"Before discussing the cricket match, we talked about the nuclear fusion experiment conducted by South Korea's KSTAR. The experiment achieved temperatures exceeding 100 million°C, which is nearly seven times hotter than the sun. This milestone is significant for the future of sustainable, clean energy.

Is there anything else you'd like to revisit or explore further? "

It somewhat changes. Weeks ago he always said "tokamak" instead of "KSTAR".