Providers

Built in: OpenAI, Anthropic, Google, Mistral, and xAI. A custom provider is any public HTTPS base URL with an OpenAI-compatible /chat/completions path. Fuse appends that path itself.

• OpenAI: chat, responses, embeddings.
• Anthropic: chat.
• Google: chat and embeddings, through the OpenAI-compatible Gemini endpoint.
• Mistral: chat and embeddings.
• xAI: chat and responses.

403 provider_key_missing means the model is allowed but that provider has no key. 403 provider_misconfigured means the custom base URL is not valid HTTPS. Keys are encrypted. The dashboard shows the last four characters and cannot show the key again.