Provider incident title: “Issues with responses using structured outputs on the API”
Started
Thursday, April 23, 2026
02:00 AM UTC
Duration
< 1 minute
total
Resolved
02:00 AM UTC
Apr 23, 2026
We have identified and resolved an issue which resulted in issues with model responses when making use of structured outputs via the Anthropic API between 16:10 UTC on April 22 and 01:59 UTC on April 23. During this period, structured outputs containing some forms of grammar requirements returned with reduced quality. This did not impact any requests not using structured outputs, as detailed here: https://platform.claude.com/docs/en/build-with-claude/structured-outputs.
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This incident was sourced from Claude's official Atlassian Statuspage. Tickerr ingests updates every 10 minutes to surface incidents as they are posted by the provider.
This incident lasted < 1 minute.
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