I may be completely off here and this is common knowledge to everyone but me… If so, I am sorry. But I have hade some strange errors in my installation, such as: DiscourseAi::Completions::Endpoints::Anthropic: status: 400 - body: { “type”:“error”, “error”:{“type”:“invalid_request_error”, “message”:“This model does not support assistant message prefill. The conversation must end with a user message.”},“request_id”:“req_011CcqMN6eswEfRHPmQmPLC4” } Which was strange since most other AI-related stuff worked. This happened primarly with my summarizer and with search as in: https://..../forum/discourse-ai/embeddings/semantic-search?q=search_term Which gave a 500 ERROR. When I checked logs I got: { "type": "error", "error": { "type": "invalid_request_error", "message": "This model does not support assistant message prefill. The conversation must end with a user message." }, "request_id": "req_011CcqQvXPAHSfvoUeu92gf9" } I traced this back to Content Create-persona [image] And the error seems to be this part: [image] because when I removed it (which wasn’t possible on this specific persona) by doing a clone and setting this setting to my clone [image] Semantic search started to work. I needed to do a similar thing in e.g. my summarizer. Is this something you guys experienced as well?

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?

[imagem] 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.

Oh, thanks for sharing! Trying to use a new model with an old Discourse is not a winning strategy :smiley:. The providers keep changing API formats, parameters, etc. We do the best to keep the compatibility with thousands of models, but that does require constant updates to keep up, specially if you want to keep up with models launched half a year (centuries in AI years) than the Discourse version.

Discourse AI: É preciso remover a resposta JSON para que o Anthropic Sonnet 5 funcione, ex.: em busca semântica

Suporte ao Produto

RGJ (Richard - Communiteq) 9 Julho , 2026 13:28 3

O fórum em questão está executando a versão 2026.1.5 ESR, e essa opção foi adicionada após a versão 2026.1, então imagino que muita lógica específica do Claude esteja faltando lá.

Tópico		Respostas	Vistas
Error using Claude 3.7 Sonnet with Discourse AI plugin Bug ai , ai-bot	10	1752	5 Março , 2025
Adding Semantic Search feature for our self-hosted discourse site Product Support ai , ai-search	9	488	19 Março , 2025
Claude 3.5 Sonnet in Discourse AI? Product Support ai	11	769	4 Julho , 2024
Discourse AI - Semantic Search & Summarization Not Working for our configuration Product Support ai , ai-summarize	5	417	17 Setembro , 2025
Discourse now supports Open AI responses API Announcements ai	0	225	11 Junho , 2025

Discourse AI: É preciso remover a resposta JSON para que o Anthropic Sonnet 5 funcione, ex.: em busca semântica

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