Structured outputs are out of beta on the Claude API for Claude Sonnet 4.5, Claude Opus 4.5, and Claude…

Thursday, 29 January 2026

AI summary

Written by AI from the official notes. Check them for exact details.

Structured outputs are now fully available on the Claude API for several models, with improved features.

Structured outputs are out of beta for Claude Sonnet 4.5, Claude Opus 4.5, and Claude Haiku 4.5.
Expanded schema support for better data structuring.
Improved grammar compilation latency for faster responses.
Simplified integration with no beta header needed.

Why it matters: Developers using Claude API should update their integrations for enhanced functionality and performance.

Structured outputs are out of beta on the Claude API for Claude Sonnet 4.5, Claude Opus 4.5, and Claude Haiku 4.5. This release includes expanded schema support, improved grammar compilation latency, and a simplified integration path with no beta header required. The output_format parameter has moved to output_config.format. Existing beta users can continue using the beta header during the transition period. Structured outputs remain in public beta on Amazon Bedrock and Microsoft Foundry.