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Structured outputs for Anthropic Claude models become generally available on Amazon Bedrock

Event: Oct 19, 2026 · Published: Oct 20, 2026

In an October 19, 2026 post on the AWS Machine Learning Blog, AWS said structured outputs for Claude on Amazon Bedrock is now generally available for all Anthropic Claude models, on both the bedrock-runtime and bedrock-mantle endpoints. AWS says the feature uses constrained decoding to enforce a developer's JSON schema during token generation, and that setting strict: true on a tool constrains the model's tool input to match its schema. The post also says some JSON Schema keywords, including numeric and string length constraints, are accepted but not enforced, so applications should validate those values themselves.1

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1.
Structured outputs for Anthropic Claude models on Amazon Bedrock (external site: aws.amazon.com)
Amazon Web Services · Announcement · published Oct 19, 2026 · accessed Oct 20, 2026

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USASI. (2026, October 20). Structured outputs for Anthropic Claude models become generally available on Amazon Bedrock. United States of America Superintelligence. https://unitedstatesofamericasuperintelligence.com/news/amazon-bedrock-structured-outputs-for-claude-generally-available/

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@misc{usasi_news_amazon_bedrock_structured_outputs_for_claude_generally_available,
  author = {{USASI}},
  title = {Structured outputs for Anthropic Claude models become generally available on Amazon Bedrock},
  year = {2026},
  month = oct,
  howpublished = {\url{https://unitedstatesofamericasuperintelligence.com/news/amazon-bedrock-structured-outputs-for-claude-generally-available/}},
  note = {United States of America Superintelligence. Last updated 2026-10-20}
}

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