AI / Claude Models Basics Interview Questions
What is the Claude model lifecycle — what do 'Active', 'Legacy', and 'Deprecated' mean?
Anthropic uses a defined set of lifecycle statuses for Claude models. Understanding these helps teams plan migration timelines and avoid unexpected outages.
| Status | Meaning | Action required? |
|---|---|---|
| Active | Fully supported and recommended for new development | No — this is the ideal state |
| Legacy | No longer receiving updates; may be deprecated in the future | Start planning migration |
| Deprecated | Still functional but a retirement date has been set; a replacement is recommended | Migrate before the retirement date |
| Retired | API calls to this model return an error | Must have already migrated |
Key policy points:
- Anthropic provides at least 60 days' notice before retiring any publicly released model
- Customers with active deployments receive email notifications when a model they use is scheduled for retirement
- Retirement dates on Anthropic-operated platforms (Claude API, Claude Platform on AWS, Microsoft Foundry) may differ from partner platforms (Amazon Bedrock, Google Cloud)
- Anthropic has committed to long-term preservation of model weights even after retirement
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