Claude Sonnet 4 model requests will be rerouted to Claude Sonnet 4.6 on May 26, 2026 because Claude Sonnet 4 is in the Legacy state on Amazon Bedrock. We recommend that you test your prompts and apps with the new model in Prompt Builder and AI Models as soon as possible, because expected responses can change.
Where: This change applies to Lightning Experience in Enterprise, Performance, and Unlimited editions with Foundations or Agentforce 1 editions.
When: Claude Sonnet 4 requests are rerouted on May 26, 2026.