A deep dive into Anthropic's Claude models reveals significant variations in their system prompts across different versions. Analysis of Fable 5, Opus 5, Opus 4.8, Opus 4.6, Sonnet 5, and Haiku 4.5 shows two distinct prompt families: an older, enumerated format and a newer, compressed prose style. Opus 5 includes unique sections for "Delivering work" and "Corrections," addressing common user feedback, while Fable 5 is noted for an explicit autonomy mandate and a bespoke identity paragraph. Despite these differences, core elements like security testing guidelines and pronoun usage rules remain consistent across all analyzed models. AI
IMPACT Reveals how Anthropic fine-tunes model behavior and addresses user feedback through system prompt engineering.
RANK_REASON Analysis of system prompts for multiple versions of a specific AI model. [lever_c_demoted from research: ic=1 ai=1.0]
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