Claude Sonnet 4 and Claude Opus 4 deprecated — migrate to Claude Sonnet 4.6 by 2026-06-15
Action Required
Applications using Claude Sonnet 4 or Claude Opus 4 must migrate to Claude Sonnet 4.6 before 2026-06-15 to avoid service disruption.
AI Impact Summary
Claude Sonnet 4 and Claude Opus 4 are deprecated with a hard retirement date of 2026-06-15, requiring a migration plan for all production usage. The recommended target is Claude Sonnet 4.6; teams should inventory integrations calling 4 or Opus 4 and begin testing against 4.6 endpoints to identify any parameter or behavior changes. Migration should include updating SDKs/libraries, adjusting prompts and default settings if needed, and validating latency and cost differences between models. Implement a controlled rollout with regression tests and fallback paths to minimize downtime as the retirement date nears.
Affected Systems
- Date
- Date not specified
- Change type
- deprecation
- Severity
- high