Anthropic

Claude SDK for C#

As of version 10+, the Anthropic package is now the official Claude SDK for C#. Package versions 3.X and below were previously used for the tryAGI community-built SDK, which has moved to tryAGI.Anthropic. If you need to continue using the former client in your project, update your package reference to tryAGI.Anthropic.

The Claude SDK for C# provides access to the Claude API from C# applications.

Documentation

Full documentation is available at platform.claude.com/docs/en/api/sdks/csharp.

Installation

dotnet add package Anthropic

Getting started

using System;
using Anthropic;
using Anthropic.Models.Messages;

AnthropicClient client = new();

MessageCreateParams parameters = new()
{
    MaxTokens = 1024,
    Messages =
    [
        new()
        {
            Role = Role.User,
            Content = "Hello, Claude",
        },
    ],
    Model = "claude-opus-4-6",
};

var message = await client.Messages.Create(parameters);

Console.WriteLine(message);

Requirements

.NET Standard 2.0+

Contributing

See CONTRIBUTING.md.

License

This project is licensed under the MIT License. See the LICENSE file for details.