Last I heard it was something like 10% of their GCR budget.
It’s also basically impossible to apply for GHD funding. I recently decided to put my money where my mouth is and get involved in an early stage GHD project, but there’s basically no EA-aligned funder who’s willing to let you approach them.
SFF are exclusively longtermist, EA GHD as mentioned basically shut down, and Givewell and CoGi don’t accept unsolicited applications. So as far as I can see if you think you have an idea in the GHD space and need funding for it you basically have to look outside the EA world (someone tell me if I missed something!)
I’m confused by the strong negative reaction to this comment. I guess it’s about the CoGi funding, which does sound like I was wrong. But it seems to be true that there’s no option to directly apply for funding for a new project (NickLaing mentions the GH funding circle, but they completed one round last year and their website doesn’t currently imply there would be any more).
I think this helps explain the decline of GHD in the OP—AIM’s charity list notwithstanding, no-one in the movement is incentivised to come up with practical ideas in the field.