This may be an extreme case but it still shows how quickly Fable 5 classifiers can reroute routine coding to Opus.
The session routed 75% of its work to Opus because the new classifiers kept misreading the coding prompts here as a cybersecurity issue.
I just paid $321 for a coding session where Fable 5 refused to do the work.
Here is where the work actually went:
Fable 5: $78 Opus 4.8: $242
75% of the session got routed to Opus because the new classifiers kept flagging routine coding work as cybersecurity risk.
The model I chose did a quarter of the job.
The fallback did the rest.
Anthropic said a small fraction of tasks would fall back.
My receipts say otherwise.