If you've used ChatGPT, Gemini or Claude for any length of time, you've probably had the experiene of reaching for a model you've grown used to only to find it gone from the menu. This typically happens when a new model launches, but it could happen just days after a release.
And while it feels like a deletion, it almost never is. What actually happens to an AI model when it's "retired" is actually pretty interesting. Old models get demoted or recycled into something that I'm calling "refurbished AI" because... there really isn't a name for it yet.
