The 4.5 models were the last Anthropic models that were actually pleasant to read. Especially Sonnet 4.5 was really fun to use for non-coding purposes. I liked having it generate silly short stories while waiting for deployments to finish. Haiku 4.5 still has a small bit of that charm, but 4.6 and later models are all unbearable unless you want a simple 'this is the answer' to a question.