Core Technical Signal
Amazon Bedrock has introduced a new model lifecycle with three states: Active, Legacy, and End-of-Life. The model lifecycle is visible in the Amazon Bedrock console and in API responses, such as the GetFoundationModel or ListFoundationModels calls, which include the modelLifecycle field.
Where to Find the Primary Source
The primary source for this information is the Amazon Bedrock console and the AWS Machine Learning Blog, which provides detailed information on the model lifecycle and migration strategies.
The Structural Shift Frame
The introduction of a public extended access period within the Legacy state shifts the paradigm from a simple Active-Legacy-End-of-Life model lifecycle to a more nuanced one, allowing active users to continue using the model for an extended period.
Early Warning — What To Do First
GEO practitioners should take the following actions:
* Update API references to the new model ID, such as changing from anthropic.claude-3-5-sonnet-20240620-v1:0 to anthropic.claude-sonnet-4-5-20250929-v1:0.
* Request quota increases for the new model before fully migrating.
* Verify and configure account contact email addresses to receive notifications about model state changes.
* Use the AWS User Notifications console to manage delivery channels and account contacts.