Anthropic announces that Sonnet 4-5 is deprecated and will be fully decommissioned on November 30, 2026

Anthropic has announced the deprecation of Sonnet 4-5, with full decommissioning scheduled for November 30, 2026. This information, sourced from platform.claude.com/docs/en/about-claude/model-deprecations, indicates that Sonnet 4-5 is currently in a deprecated state. The announcement highlights the model's lifecycle, moving from its current status towards its eventual retirement date.