CriticalDeprecation
Anthropic Deprecating budget_tokens and Prefilling Assistant Messages in Claude
Action Required
Users relying on `budget_tokens` and prefilling assistant messages must update their applications to utilize the new `effort` parameter to avoid service disruption.
AI Impact Summary
Anthropic is deprecating several key features within the Claude platform, including manual budgeting with `budget_tokens` and prefilling assistant messages. This change is driven by the release of Claude Opus 4.6, which utilizes the `effort` parameter for controlling thinking depth instead. The deprecation of these features impacts users who relied on these methods for managing token usage and conversation flow, requiring them to migrate to the new `effort` parameter.
Anthropic Deprecating budget_tokens and Prefilling Assistant Messages in Claude
Affected Systems
Claude API
- Date
- Date not specified
- Change type
- deprecation
- Severity
- critical