What is the difference between Claude Sonnet 5's Priority Tier support and Claude Sonnet 4.6's?

Claude Sonnet 4.6 supported Priority Tier, while Claude Sonnet 5 does not support it at all - a direct capability gap between the two versions, mirroring the same gap that exists between Opus 4.8 and Opus 5.

This is a hard regression rather than a behavioral shift that can be worked around through prompting or configuration, so any workload that specifically depended on Priority Tier for Sonnet 4.6 traffic needs an explicit decision about how to handle that traffic before or during migration.

Because this is a binary capability difference rather than a nuanced tradeoff, it's one of the more straightforward items to check off during a Sonnet 4.6-to-Sonnet-5 migration audit, compared to the more open-ended tuning work involved in adjusting for thinking defaults or verbosity changes.

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