FABLE 5

Fable 5 ships with safety classifiers that route flagged requests away from the model. In production you need to handle this, and Anthropic shipped three ways to do it. Here's how each one works, with code, plus the billing rules nobody has written up.

Anthropic gave subscribers two weeks of free Fable 5 access, then it moves to usage credits. Here's what's actually changing, what the real-world burn rates look like, and what to do depending on how you use Claude.

Fable 5 lists at $10/$50 per million tokens - twice Opus 4.8. But list price is the wrong number. Here is the cost-per-outcome math that actually decides whether the upgrade pays.

Fable 5 is mostly a drop-in replacement for Opus 4.8, but 'mostly' is doing real work in that sentence. Here's every breaking change, what to delete from your code, and the prompt audit you should run before flipping the model ID.