A: Hello Nadia,

Thank you for reaching out.

Access to various AI models (including Claude) is provided via OpenRouter and this feature is only available in Tier 7. Once you're on Tier 7 and have added your OpenRouter API Key, then you can select models from Anthropic, Meta, xAI, Google, Mistral, DeepSeek etc.
Please mind that regardless which model/model provider you're using, you will have to add an OpenAI API Key. This is because of a specific (embeddings) model that we use during training and chat flows isn't available on OpenRouter.

There is no limit that we set on system instructions, but of of course it is bound to the context window of a given model.

Temperature can be configured depending on the model properties, most reasoning models like o1 does not allow temperature configuration, but otherwise you can always configure it.

Let me know if there is anything I can assist with.

All the best,
Oscar