Claude Fable 5.1 Prompt Tips on Venice

Claude Fable 5.1 prompting guidance for Venice Classic Chat emphasizes that long agent tasks benefit from clear direction rather than vague goals: users should define a role, break work into phases, set measurable completion criteria for the current phase, and instruct the model when to stop. The guidance recommends placing stable rules, source material, file trees, and formatting requirements in a reusable context prefix while putting changing tasks or errors at the end to improve cache efficiency. It also encourages structured responses such as status fields, tables, JSON schemas, patch summaries, and open questions instead of lengthy narrative updates. Users are advised to select Fable 5.1 explicitly, use the System Prompt for persistent constraints, enable web search only for current information, and caption visual attachments. Because Fable 5.1 is positioned as slower and more expensive than alternatives, the text suggests using it for defined, multi-step agent workflows while using models such as Claude Opus 5 or Kimi K2.5 for earlier exploration. It further notes that Venice routes prompts anonymously and does not train on user inputs, though the provider still receives conversation content needed to generate replies.

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