There were a lot of pitchforks back when Sonnet 4.5 was accidentally down for a few hours: https://www.reddit.com/r/ClaudeAI/comments/1rlz7kw/sonnet_45...

It goes to show that there's a very large and vocal user base using it for writing, and yet it's not part of the benchmark for Anthropic.

Anyway, try Sonnet 4.5 while it's still available?