HighDeprecation
Claude Sonnet 4.5/4 1M-token context beta retired — migrate to 4.6 or Opus 4.6
Action Required
Applications relying on 1M-token contexts will experience errors for requests over 200k tokens unless migrated to Claude Sonnet 4.6 or Claude Opus 4.6.
AI Impact Summary
The 1M-token context window beta for Claude Sonnet 4.5 and Claude Sonnet 4 has been retired; any request exceeding 200k tokens will fail. To preserve 1M-context capability, migrate to Claude Sonnet 4.6 or Claude Opus 4.6, and update request paths accordingly. Workloads handling long documents, large codebases, or extensive embeddings will be disrupted unless teams adjust their pipelines, validate with representative data, and ensure clients call the new model endpoints.
Claude Sonnet 4.5/4 1M-token context beta retired — migrate to 4.6 or Opus 4.6
Affected Systems
Claude Sonnet 4.5
- Date
- Date not specified
- Change type
- deprecation
- Severity
- high