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
Which current Claude model does NOT support zero data retention (ZDR)?
What is zero data retention (ZDR) in the context of the Claude API?
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