CriticalDeprecation
Anthropic Claude 3.7 Sonnet moving to legacy status — migration to Claude Sonnet 4.5 required by April 2026
Action Required
Failure to migrate applications from Claude 3.7 Sonnet to Claude Sonnet 4.5 will result in service disruption and require significant application rework.
AI Impact Summary
Anthropic is deprecating Claude 3.7 Sonnet, moving it to a legacy status with a critical migration deadline of April 28, 2026. This requires immediate action to avoid service interruption, as new customers will no longer be able to use this model. Users must migrate to Claude Sonnet 4.5 to maintain access and functionality.
Anthropic Claude 3.7 Sonnet moving to legacy status — migration to Claude Sonnet 4.5 required by April 2026
Affected Systems
Claude 3.7 Sonnet
- Date
- 28 Apr 2026
- Change type
- deprecation
- Severity
- critical