I tried out fable 5.1 the day it was released and coming from gpt-5.6-sol I was truly mind blown (both in terms of code and prose it was generating - outputs I could finally enjoy reading and looking at).
Then when opus 5.5 came out, again same thing + far cheaper and faster.
I went from using OAI exclusively the entire year to a point now where i haven’t touched one of their models in at least a few weeks now.
I think OAI has lost the plot. OAI models simplify have no taste. And I don’t mean in front-end design way (although that too). They have no taste in how the model writes code, how it writes prose, how it writes in-line comments, how it writes documentation, or how it even picks variable names. There’s just no taste throughout.
Anthropic models are very thoughtful and have so much taste all around.