Anthropic has announced the deprecation of the Claude Sonnet 4.5 model (claude-sonnet-4-5-20250929). The model will be retired from the Claude API on November 30, 2026. Developers currently using the model are advised to migrate to Claude Sonnet 5.5, for which Anthropic provides migration guidance.
Key Facts
- Model: Claude Sonnet 4.5 (claude-sonnet-4-5-20250929) to be discontinued
- Retirement Date: November 30, 2026
- Successor: Claude Sonnet 5.5 with official migration guide
- Source: Anthropic Release Notes
What This Means
For developers and enterprises in Germany using Claude Sonnet 4.5 in production, planning the migration early is advisable—the deadline is roughly two years away. Anthropic provides documentation to facilitate the transition. Those without a migration strategy should add it to their roadmap now.
Sources
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