HighDeprecation
Claude Sonnet 4.5/4 1M-context beta retired — migrate to Claude Sonnet 4.6 or Claude Opus 4.6
Action Required
Applications relying on 1M-context prompts in Sonnet 4.5/4 must migrate to Sonnet 4.6 or Opus 4.6 to continue using large contexts; calls above 200k tokens will fail until migration completes.
AI Impact Summary
The 1M-token context window beta for Claude Sonnet 4.5/4 has been retired, and requests exceeding 200k tokens will error. To regain 1M-context capability, customers must upgrade to Claude Sonnet 4.6 or Claude Opus 4.6, and use standard pricing with no beta header. Plan migration by updating clients to target the new models, remove any beta header, and verify pricing and latency under realistic workloads.
Claude Sonnet 4.5/4 1M-context beta retired — migrate to Claude Sonnet 4.6 or Claude Opus 4.6
Affected Systems
Claude Sonnet 4.5
- Date
- Date not specified
- Change type
- deprecation
- Severity
- high