[bkrausz]

(I work on product at Anthropic)

Sorry to hear about that! It sounds like you might have been using an unpinned model version, e.g. `claude-2`, which is designed to automatically get the latest models as they are released. We also support pinned model versions, e.g. `claude-2.0` or `claude-2.1`, which will not be upgraded automatically.

We've been moving away from recommending unpinned versions and are likely to only have pinned versions with future major model releases to avoid this sort of issue.