HighCapability
Max Claude Tokens Cap Increased to 300k on Message Batches API
Action Required
Users can now generate significantly longer outputs with Claude, opening up new possibilities for complex tasks but requiring code changes to utilize the increased token limit.
AI Impact Summary
Anthropic has significantly increased the maximum token limit for Message Batches API calls to 300,000 tokens on Claude Opus and Sonnet models. This change enables users to generate much longer outputs for tasks like long-form content creation, code generation, and complex reasoning. The introduction of the `output-300k-2026-03-24` beta header is crucial for leveraging this expanded capacity, and users should migrate to Claude Sonnet 4.6 or Claude Opus 4.7 to take advantage of the full 1M token context window.
Max Claude Tokens Cap Increased to 300k on Message Batches API
Affected Systems
Claude Opus
- Date
- Date not specified
- Change type
- capability
- Severity
- high