Amazon Bedrock adds structured JSON outputs for Anthropic Claude models

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.