Fable 5 costs $10 per million input tokens and $50 per million output tokens, above every other Claude model. This article covers 6 prompting habits that cut wasted spend, plus the exact triggers that cause an automatic fallback to Opus 4.8. It also shows how effort levels affect cost. 💡

We'll talk about:

• Why Fable 5 costs more than other Claude models
• Adding the why behind a task instead of a bare instruction
• Setting clear boundaries so Fable 5 doesn't overreach
• Letting Fable 5 act once it has enough context
• Matching effort level to the actual task
• Asking for proof the work is done
• Keeping prompts short and skipping hidden-reasoning requests
• What triggers an automatic fallback to Opus 4.8
• How billing works when a fallback happens mid-respon ...