# Amazon Bedrock adds structured JSON outputs for Anthropic Claude models

Digest AI · Agents & Tools · published 2026-10-19T23:32:19Z

Canonical: https://digestai.news/story/amazon-bedrock-adds-structured-json-outputs-for-anthropic-claude-model

## Summary

Amazon Bedrock now supports structured outputs for every Anthropic Claude model on both the bedrock‑runtime and bedrock‑mantle endpoints. When a request includes a JSON schema, the service validates the schema, compiles a grammar artifact, caches it for 24 hours, and then generates tokens that always produce a valid JSON document matching the schema. This eliminates the need for custom parsing, retry logic, or post‑processing.

The feature works with batch inference, cross‑Region calls, and streaming of typed events. Because the model can only emit tokens that satisfy the schema, responses are deterministic, type‑safe, and often use fewer tokens, lowering inference costs for high‑volume workloads. Developers are advised to set "additionalProperties": false, use descriptive field names, and reuse schemas to benefit from caching. The first request for a new schema may be slower while the grammar is compiled, but subsequent calls are fast.

## Key points

- Structured outputs now available for all Anthropic Claude models on Bedrock runtime and Mantle endpoints.
- JSON schema is enforced during generation, eliminating parse errors and reducing token usage.
- Compiled grammar artifacts are cached for 24 hours, so repeated schema calls have minimal overhead.

## Why it matters

Deterministic, schema‑validated outputs remove parsing failures and retry logic, lowering development effort and inference costs, which accelerates production AI pipelines and reliable agentic workflows.

## Sources

1. [Structured outputs for Anthropic Claude models on Amazon Bedrock](https://aws.amazon.com/blogs/machine-learning/structured-outputs-for-anthropic-claude-models-on-amazon-bedrock) (AWS Machine Learning Blog, 2026-10-19, primary source)

## Cite

Digest AI, "Amazon Bedrock adds structured JSON outputs for Anthropic Claude models", 19 October 2026, https://digestai.news/story/amazon-bedrock-adds-structured-json-outputs-for-anthropic-claude-model

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