How Anthropic Engineers Actually Prompt Fable 5

This video serves as a lecture on effectively prompting Claude Fable 5, emphasizing its strengths as a short-instruction model that performs better with context than older models. The presenter, Nate Herk, walks through six key prompting habits, derived from Anthropic's own documentation, designed to elicit better results from Fable 5. These habits include 'Give it the why,' 'Tell it what NOT to do,' 'Let it act once it has enough,' 'Make it prove it,' 'Stop asking it to 'show its reasoning',' and 'Say less, not more.' Each habit is explained with examples of 'instead of' and 'do this' prompts. Herk also touches upon how Fable 5 differs from Opus 4.8, noting that Fable 5 is generally more capable for prior models and cost-effective for simpler workloads. The video highlights the importance of providing specific context and avoiding overly complex or ambiguous prompts. Finally, Herk briefly mentions the 'show its reasoning' prompt and its potential to trigger refusals, advising instead to ask for the answer and let the model think privately. The cost comparison between Fable 5 and Opus 4.8 suggests Fable 5 is more efficient for certain tasks.