HighDeprecation
Claude Sonnet 1M context window beta retired; migrate to Sonnet 4.6 or Opus 4.6
Action Required
Long-context workloads using Claude Sonnet 4.5/4 will fail for 1M-token requests; upgrade to Claude Sonnet 4.6 or Claude Opus 4.6 to restore 1M-context support.
AI Impact Summary
Claude Sonnet 4.5 and Claude Sonnet 4 beta 1M-context window have been retired. Any requests that exceed the 200k-token limit will fail, breaking workflows that rely on long-context histories. To maintain 1M-token capability, migrate workloads to Claude Sonnet 4.6 or Claude Opus 4.6; anticipate potential changes to model identifiers and client-side token budgeting. Plan validation in staging to confirm long-context requests succeed after migration.
Claude Sonnet 1M context window beta retired; migrate to Sonnet 4.6 or Opus 4.6
Affected Systems
Claude Sonnet 4.5
- Date
- Date not specified
- Change type
- deprecation
- Severity
- high