As already posted here:

https://divestos.org/pages/patch_levels

Also on the Graphene website:

https://grapheneos.org/features

https://grapheneos.org/faq

Here is a page that summarize what was recently patched and improved on both Graphene vs Calyx:

https://www.nobsbitcoin.com/grapheneos-and-calyxos-july-security-updates-released/