Vercel AI SDK for .NET

Unofficial community port of the Vercel AI SDK for server applications.

Quickstart

Install Vercel.AI and the provider package you call. OpenAIProvider.Create() reads OPENAI_API_KEY. GatewayProvider.Create() reads AI_GATEWAY_API_KEY.

using Vercel.AI;
using Vercel.AI.OpenAI;

var model = OpenAIProvider.Create().LanguageModel("gpt-4.1-mini");
var client = new AiClient(Vercel.AI.Gateway.GatewayProvider.Create(new() { ApiKey = "unused" }));
var result = await client.GenerateTextAsync(new GenerateTextOptions
{
    Model = model,
    Instructions = "Answer in one sentence.",
    Prompt = "What is a language model specification?",
});
Console.WriteLine(result.Text);

AiClient is only required for the high-level helpers. Pass Model when you already have an ILanguageModel. Pass ModelId (openai/gpt-4.1-mini) when the Gateway should resolve it.

In ASP.NET Core, services.AddAiSdk() registers IAiClient and a named HttpClient.

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