The most recent 3 generations of Pixels have 7 years of support rather than the 3 provided by the Pixel 4a. Pixel 4a no longer has driver or firmware updates or official support for current Android releases, so GrapheneOS doesn't officially support it anymore. We did provide extended support releases and legacy extended support releases past end-of-life until earlier this year (2025012701 was the last one), but lack of community support led to those being paused and few people still use the legacy devices based on update server stats of update check counts.
It's why 5-7 years of support are one of the requirements our OEM partner has to provide to meet our official list of requirements published at https://grapheneos.org/faq#future-devices. We'd like to require 7 years of support to match Pixels but didn't want to raise the bar too high. We can settle for 5 and have OEMs work towards 7 for later devices after starting with a 5 year commitment.
It's why 5-7 years of support are one of the requirements our OEM partner has to provide to meet our official list of requirements published at https://grapheneos.org/faq#future-devices. We'd like to require 7 years of support to match Pixels but didn't want to raise the bar too high. We can settle for 5 and have OEMs work towards 7 for later devices after starting with a 5 year commitment.