What is the difference between Opus 5 and Opus 4.8 rate limits?

Claude Opus 5 draws on its own separate rate-limit bucket, distinct from the combined pool that Opus 4.x models, like 4.6, 4.7, and 4.8, share together.

This means shifting traffic from Opus 4.8 over to Opus 5 doesn't free up headroom on the old shared Opus 4.x bucket, and it also doesn't automatically inherit whatever headroom existed there - the two are tracked independently.

Because of this, teams planning a significant traffic shift to Opus 5 are advised to check their account's specific Opus 5 rate limits ahead of time, rather than assuming existing Opus 4.8 capacity planning carries over directly to the new model.

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