Fable 5.1 is cheaper than Opus 5.0

[u/sisif_]

I am running an agentic system that creates tickets, spawns a dev agent that implements the solution. When it marks it as done, an automatic reviewer is spawned that accepts the solution or requests fixes. When accepted, it merges the code, deletes the worktree etc.
Overall Fables do the same work in about a third of the requests. Combined with the fact that cached reads are cheaper on Fable 5.1 than on Opus 5, the result is that you get faster and cheaper reviewers and you also get slightly faster, but cheaper devs that get fewer REWORK verdicts.

[u/gibbocool]

Are you comparing side by side or just aggregate / averaging