Was just searching on Bsky due to a weird error I got using Sonnet 4.6 > it said the chat needed to switch back to Sonnet 4 to continue.
And I’m on a Max plan.
Model deprecation is the ultimate builder’s headache.
It’s exactly why I’ve been focusing on decoupling the 'engine' logic from the specific LLM. Being model-agnostic is the only way to keep the experience stable when the APIs shift.