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Claude's 1M token context window now generally available for Opus 4.6 and Sonnet 4.6
Claude · releasefeatureapimodel · docs.anthropic.com ↗

1M Token Context Window GA

Anthropic announced on March 13, 2026 that the 1M token context window is now generally available for Claude Opus 4.6 and Sonnet 4.6 at standard pricing. Requests exceeding 200k tokens now work automatically with no beta header required, making long-context processing more accessible to developers.

Simplified Rate Limiting & Increased Media Limits

The company removed dedicated 1M rate limits, consolidating rate limiting across all context lengths under standard account limits. This streamlines API management for developers using variable context sizes.

Additionally, Anthropic raised the media processing limit from 100 to 600 images or PDF pages per request when using the 1M token context window—a 6x increase enabling richer document and image analysis workflows.

Remaining Beta Support

The 1M token context window remains in beta for Claude Sonnet 4.5 and Sonnet 4, giving developers a migration path as they upgrade to newer models.

Developer Action Items

  • Upgrade to Opus 4.6 or Sonnet 4.6 to access 1M token context at standard pricing
  • Update any code that checks for beta headers—they're no longer required for these models
  • Leverage the expanded 600-image/PDF limit for document-heavy applications