Fable 5 is Anthropic's most "honest" model

Anthropic's Fable 5 model has become the company's most "honest" model to date, frequently telling users it is being honest in its responses. A user who indexed 202,381 messages from local Claude Code sessions over the past 30 days observed a steady increase in the model using the word "honest" since Opus 4.6. The user noted that while Fable initially appeared to have fixed this behavior, it soon proved itself to be the most honest model yet.

Fable 5 is Anthropic's most "honest" model to date. It tells you right in the response. I index all my local Claude Code sessions in DuckDB. I have 202,381 messages in the last 30 days alone. There's been a steady increase since Opus 4.6 in the model saying "honest". It this bugs me. Should I assume most of the time you're lying and you're being honest in this one message? I was pumped in the first few hours of Fable where this had seemingly been "fixed". 100+ messages and no "honest" to be seen. But it was too good to be true. Within a few hours, Fable proved itself to be the most honest model to date. Analysis done in Codex because I need to save my Fable usage for real work 😅