Fable 5 Prompting: Five Moves, and the First Is a Deletion
The line most prompt libraries still carry — explain your reasoning — is now a documented way to get refused on Fable 5 and silently downgraded to Opus 4.8. Five model-specific moves from Anthropic's own docs, with the parameter names, the defaults, and where each one backfires.
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Fable 5 Prompting: Five Moves, and the First Is a Deletion — The line most prompt libraries still carry — explain your reasoning — is now a documented way to get refused on Fable 5 and silently downgraded to Opus 4.8. Five model-specific moves from Anthropic's own docs, with the parameter names, the defaults, and where each one backfires.
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