C# .NET SDK для AI API

dotnet add package Betalgo.OpenAI

using OpenAI;
using OpenAI.Chat;

var options = new OpenAIClientOptions
{
    Endpoint = new Uri("https://api.aitunnel.ru/v1/")
};

var client = new OpenAIClient("sk-aitunnel-xxx", options);
var chatClient = client.GetChatClient("gpt-5.2");

var response = await chatClient.CompleteChatAsync(
    new ChatMessage[] 
    {
        new UserChatMessage("Привет! Расскажи о C#.")
    }
);

Console.WriteLine(response.Value.Content[0].Text);

// Program.cs
builder.Services.AddSingleton(sp =>
{
    var options = new OpenAIClientOptions
    {
        Endpoint = new Uri("https://api.aitunnel.ru/v1/")
    };
    return new OpenAIClient(
        builder.Configuration["AiTunnel:ApiKey"], 
        options
    );
});