https://grapheneos.org/faq#recommended-devices
Non-exhaustive list of requirements for future devices, which are standards met or exceeded by current Pixel devices:
Support for using alternate operating systems including full hardware security functionality
Complete monthly Android Security Bulletin patches without any regular delays longer than a week
At least 5 years of updates from launch for phones (Pixels now have 7) and 7 years for tablets
Vendor code updated to new monthly, quarterly and yearly releases of AOSP within several months to provide new security improvements (Pixels receive these in the month they're released)
Linux 5.15 or Linux 6.1 Generic Kernel Image (GKI) support
Hardware accelerated virtualization usable by GrapheneOS (ideally pKVM to match Pixels but another usable implementation may be acceptable)
Hardware memory tagging (ARM MTE or equivalent)
BTI/PAC, CET or equivalent
PXN, SMEP or equivalent
PAN, SMAP or equivalent
Isolated radios (cellular, Wi-Fi, Bluetooth, NFC, etc.), GPU, SSD, media encode / decode, image processor and other components
Support for A/B updates of both the firmware and OS images with automatic rollback if the initial boot fails one or more times
Verified boot with rollback protection for firmware
Verified boot with rollback protection for the OS (Android Verified Boot)
Verified boot key fingerprint for yellow boot state displayed with a secure hash (non-truncated SHA-256 or better)
StrongBox keystore provided by secure element
Hardware key attestation support for the StrongBox keystore
Attest key support for hardware key attestation to provide pinning support
Weaver disk encryption key derivation throttling provided by secure element
Insider attack resistance for updates to the secure element (Owner user authentication required before updates are accepted)
Inline disk encryption acceleration with wrapped key support
64-bit-only device support code
Wi-Fi anonymity support including MAC address randomization, probe sequence number randomization and no other leaked identifiers