What
Differentiated system prompt instructions for Opus 4.6 models that emphasize concise, anti-verbose communication and refined code quality guidance.
Status
Feature-flagged via quiet_salted_ember (server-controlled, only applies to Opus 4.6 models)
Details
- When enabled, adds a "Communicating with the user" prompt section instructing the model to give brief updates at key moments rather than verbose explanations
- Includes refined code quality instructions: "Default to writing no comments. Only add one when the WHY is non-obvious"
- Adds anti-verbosity guidance as a separate prompt category
- Includes refined instructions about not adding features/refactoring beyond what was asked
- The
cM6()gate function checks both the model family (must include "opus-4-6") and thequiet_salted_emberflag value
Evidence
Opus 4.6 prompt tuning (gated by quiet_salted_ember, search for "Default to writing no comments" and "Communicating with the user")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.