When Anthropic deprecates an older Claude model, what typically happens to API calls using that model ID?
Select an answer to reveal the explanation.
Short Explanation
Deprecation means you get a grace period, then the old model ID stops working. Track Anthropic's announcements and test migration before the deadline.
Full Explanation
When Anthropic deprecates a model, they typically provide advance notice and a migration timeline. After the sunset date, API calls using the deprecated model ID may return errors or be redirected to a newer model (which may have different behavior). Developers should: monitor Anthropic's announcements, test their applications with the replacement model, and migrate before the deprecation deadline. Option A is wrong — deprecated models don't work forever. Option C is wrong — no 'free tier' exists for deprecated models. Option D is wrong — automatic silent upgrades would cause unexpected behavior changes and don't match Anthropic's practice.