Answers come only from this site's public data, never professional advice. If a question falls outside the library, the assistant says so.
Example questions
Worked example
Q: Which platforms support persistent custom instructions?
A: Several platforms in our directory support persistent instructions, for example ChatGPT (Custom Instructions and Projects), Claude (Project instructions and Styles), and Gemini (Saved Info and Gems); each entry lists how personalization works and when we last reviewed it. See the directory for the current list. /platforms