Fable so far has only been incrementally better than Opus 4.8 in my testing. The testing so far has been coding on a large monolith. In general Claude is starti

Fable so far has only been incrementally better than Opus 4.8 in my testing. The testing so far has been coding on a large monolith. In general Claude is starting to feel like it's optimize for greenfield vibe-coding projects. I vastly prefer Codex for coding on large, established codebases.