async embed(text) {
        throw new Error('Embeddings are not supported by Hyperbolic.');
    }
Sends a chat completion request to the Hyperbolic endpoint.

@param {Array} turns - An array of message objects, e.g. [{role: 'user', content: 'Hi'}].
@param {string} systemMessage - The system prompt or instruction.
@param {string} stopSeq - A stopping sequence, default '***'.
@returns {Promise<string>} - The model's reply.