HighDeprecation
Claude 1M-context beta retired — migrate to Sonnet 4.6 or Opus 4.6
Action Required
Applications relying on 1M-context beta must migrate to Claude Sonnet 4.6 or Claude Opus 4.6 to avoid errors when using large-context prompts and to align with standard pricing.
AI Impact Summary
Claude has retired the 1M-context beta (context-1m-2025-08-07). Any request that exceeds 200k tokens on Claude Sonnet 4.5/4 will now error, forcing migration for large-context workloads. To continue using 1M contexts, teams must upgrade to Claude Sonnet 4.6 or Claude Opus 4.6 and remove any beta header, as pricing remains standard rather than beta. Plan updates to client libraries, review token budgets, and validate end-to-end latency against the new models.
Claude 1M-context 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