Claude Fable 5.1 Effort Levels: Start on Low, Not High

Podcast/Substack · ~18 min · Listen

• Nate B. Jones advocates for starting with the “Low” effort setting when using frontier models like Claude Fable 5.1 for knowledge work (Excel, PowerPoint, Word) to optimize workflow and cost.
• The “Low” effort run is “good enough” to produce a functional draft (e.g., a seven-sheet Excel workbook and a 13-slide PowerPoint deck from a single short prompt), enabling users to identify flaws and understand the problem before spending expensive tokens on higher effort levels.
• This strategy is critical because knowledge work, unlike code, lacks immediate feedback on correctness (e.g., a spreadsheet perfectly calculates bad assumptions), making iterative review of a cheap, low-effort draft essential for discovering the true story and ensuring accuracy.
• Users should generate initial drafts on “Low,” then review the output and move to “High” or “Extra” settings only for specific parts requiring judgment or revision, utilizing the exact prompts provided in the article for efficient iteration.