Pixels only ship a tiny subset of the security preview patches early. Samsung ships a subset for their flagship devices too and it's likely larger than Pixels. Samsung lists these patches in their bulletins and you can retroactively figure out which were future Android Security Bulletin patches. Go through the vulnerabilities for September 2026 or October 2026 and search for them in Samsung's bulletin.

The only way to get the full set of security preview patches is through GrapheneOS. It's strange Google doesn't ship more for the Pixel OS but that's the way it is right now. It takes them around 4 weeks to make a release and even longer when including the time for adding changes to it so there's a long delay built into the process. They should fix it but are clearly not prioritizing it without media pressure that's not happening. They do a lot better than other OEMs but that's much different from doing a good job.