Anthropic reportedly has a separate prompting guide for Fable 5

JafarNajafov · x · 2026-07-23

The post says Anthropic has quietly published a separate prompting guide for Fable 5, warning that prompting it the same way as Opus wastes tokens.

It highlights a practical shift in usage: a new model may need different instructions, and the linked guide is framed as the source of truth for how to prompt it effectively.

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