Discourse AI: Need to Remove JSON Response to get Antrophic Sonnet 5-working in e.g. semantic search

[RGJ (Richard - Communiteq)]

@Falco

Can you show how Sonnet 5 is configured on your instance?

Do you have Disable native structured output (use assistant message prefilling instead, required for Claude 3.x and older) enabled by any chance?

The forum in question is running 2026.1.5 ESR, and this option was added after 2026.1, so I guess a lot of Claude specific logic is missing there.