Changes
PR #1979 by 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-godependency 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