AI / Claude Models Basics Interview Questions
What is zero data retention (ZDR) and which Claude models support it?
Zero data retention (ZDR) is a data handling agreement where Anthropic does not store API inputs or outputs after a response is returned. This is important for organisations with strict data privacy requirements (healthcare, legal, finance) where conversation data must not persist on Anthropic's servers.
| Model | ZDR available? |
|---|---|
| Claude Fable 5 | No — requires 30-day minimum retention |
| Claude Opus 4.8 | Yes |
| Claude Sonnet 5 | Yes |
| Claude Haiku 4.5 | Yes |
| Claude Opus 4.7, 4.6 | Yes |
| Claude Mythos 5 | Contact Anthropic |
How ZDR works:
- ZDR must be arranged as part of an API agreement — it is not a per-request option
- With ZDR, Anthropic does not log or store prompt/completion data after the API response is delivered
- ZDR is separate from prompt caching — cached data is still subject to your data handling agreement
- Organisations with ZDR requirements who want the highest capability model should use Claude Opus 4.8 rather than Fable 5
- ZDR customers are still subject to Anthropic's usage policies and safety systems
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