What is the difference between Claude Opus 5's Priority Tier support and Claude Opus 4.8's?

Claude Opus 4.8 supported Priority Tier, a paid enterprise feature some teams relied on for their traffic, while Claude Opus 5 does not support Priority Tier at all.

This is a concrete capability regression to account for during migration - enterprise teams paying for Priority Tier on Opus 4.8 traffic need to make an explicit decision about how to handle that traffic before or during a move to Opus 5, rather than assuming the feature carries over automatically.

Unlike most other migration considerations, which are behavioral adjustments that can be worked around with prompting or configuration changes, this one is a hard capability gap with no equivalent replacement currently available on Opus 5.

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