Idk how could Fable 5.2 win the benchmarks. In my tonight trials it drifted quite a lot. I was analyzing the feature's design with it, and it lied to me several times, ending up with "You're right." Opus 5.5 was better.

Later, I ran a "health check" session—asking "what went wrong". I read the session, and its suggestion turned out to be something that was already part of the design.

It’s like the attention mechanism is too leaky or something.