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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.

Model lifecycle statuses
StatusMeaningAction required?
ActiveFully supported and recommended for new developmentNo — this is the ideal state
LegacyNo longer receiving updates; may be deprecated in the futureStart planning migration
DeprecatedStill functional but a retirement date has been set; a replacement is recommendedMigrate before the retirement date
RetiredAPI calls to this model return an errorMust 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
What does 'Deprecated' mean for a Claude model?
How much advance notice does Anthropic provide before retiring a publicly released Claude model?

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