ISSUE:Selected model is at capacity. Please try a different model

A user reported an issue with their PRO×20 account, stating they are unable to use the GPT-6 and GPT-5.6 models due to a "Selected model is at capacity" error since yesterday. This problem does not affect their other Plus account, which can access GPT-6 without issues. The user is seeking to know if others have experienced this and how it was resolved.

This report highlights a capacity issue affecting PRO×20 accounts for GPT-6 and GPT-5.6, unlike Plus accounts which remain unaffected, indicating a potential tier-specific problem.