HighDeprecation
Claude 1M-token context beta retired — migrate to Sonnet 4.6 or Opus 4.6
Action Required
Applications relying on 1M-token context will fail for prompts over ~200k tokens unless they migrate to Claude Sonnet 4.6 or Claude Opus 4.6.
AI Impact Summary
The 1M-token context window beta (context-1m-2025-08-07) for Claude Sonnet 4.5/4 has been retired, causing requests that exceed ~200k tokens to error. This affects long-document and large-history use cases, necessitating migration to Claude Sonnet 4.6 or Claude Opus 4.6 to regain 1M context support. Teams should update model references to the 4.6 family, validate handling of long prompts, and implement chunking or streaming where applicable to maintain throughput and context-rich interactions.
Claude 1M-token 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