Claude Fable 5.2: Anthropic Recommends Easing the Rules
Fable 5.2 is presented as Anthropic's most powerful public model and is claimed to outperform Fable 5.1. Its highly accurate adherence to instructions changes prompting practices. Anthropic advises avoiding absolute prohibitions and clarifying the scope of rules. Existing instruction files should be reviewed.
Absolute Rules: A Risk of Too Literal Adherence
Anthropic recommends rephrasing absolute rules by specifying their scope. A too-literal adherence to instructions can become problematic when they are overly restrictive. For example, if a CLAUDE.md file categorically prohibits certain actions without providing context or exceptions, Fable 5.2 may apply this directive very literally. The model follows instructions precisely and behaves differently from previous versions of Claude.
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Review Instruction Files and Prompting Practices
The first key rule is to revise and clean up old instructions. It is recommended to examine three locations: the CLAUDE.md file for project-related directives, the SKILL.md files in the skills/ directory, and the AGENTS.md files in the agents/ directory. Five main rules are announced to guide the prompting of Fable 5.2, which presents specific patterns to be aware of. This model is presented as Anthropic's most powerful publicly available model and is claimed to outperform Fable 5.1.
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