A: API is partially compatible with the OpenAI API. It follows a similar REST + JSON chat structure and supports streaming responses, making it familiar to developers who already use OpenAI-style APIs. However, it is not a drop-in replacement, because Qolaba uses its own request format (for example llm and llm_model parameters, and a custom history structure).

Are there clients for LangChain / Haystack / n8n?
n8n: Yes — integration works using the HTTP Request node with Qolaba’s /stream_chat endpoint.
LangChain & Haystack: We have not tested these internally yet, so official compatibility or ready-made clients cannot be confirmed at this time.