client := perplexity.New(
    perplexity.Defaults(prompts.WithApiKey[perplexity.Event](os.Getenv("PPLX_API_KEY")))...)

msgs := []prompts.ChatCompletionMessage{
    {
        Role:    prompts.RoleSystem,
        Content: "You are a helpful assistant. You start every answer with 'Sure my lord!'",
    },
    {
        Role:    prompts.RoleUser,
        Content: "What is the definition of Pi?",
    },
}

req := prompts.NewStreamChatCompletionRequest(msgs...)
req.Model = perplexity.DefaultModel

stream, err := client.SendStreamCompletionRequest(context.Background(), req)
if err != nil {
    panic(err)
}

prompts.Print(stream)