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/



fixthemoneyfixtheworld

2bithits

tech

Calyx - What do you think?

graben

Graphene is much more patched for security issues on Android than CalyxOS. 

I'm not saying Calyx is worthless and it's probably a far better option than some random mainstream manufacturer roms in the privacy department. However, if the security of your phone is your top priority, Graphene is the best choice.