GitHub has an incident on this. Looks like GPT 5.2 and 5.1 models are also missing.

https://www.githubstatus.com/incidents/vyxbxqhdt75d

Looks like access has been restored

Just checked my Claude usage page https://claude.ai/settings/usage and it's not showing my weekly/session limits or anything, just my Extra usage. And typing /usage in claude ain't doing nada. (20x plan just paid my bill yesterday)