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+### PR [#1979](https://github.com/danielmiessler/Fabric/pull/1979) by [ksylvan](https://github.com/ksylvan): Update Anthropic SDK to v1.20.0 and reorganize model definitions
+
+- Feat: update Anthropic SDK to v1.20.0 and reorganize model definitions
+- Bump `anthropic-sdk-go` dependency from v1.19.0 to v1.20.0
+- Add deprecation notice for pre-February 2026 legacy models
+- Add new Claude Sonnet 4.0 and Opus 4.0 model aliases
+- Extend 1M context beta support to all Sonnet 4 variants