Anthropic SDK for C#

Official Anthropic C# / .NET SDK for the Claude API.

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.NET client for the Claude Messages API and Batch API. Targets net6.0/net8.0 and ships with first-class async streaming support.

What it does

Official Anthropic SDK for .NET (`dotnet add package Anthropic`)
Typed request/response models for the Messages API with async-first client
Source-generated serialization for AOT-friendly use

When to use it

.NET backends calling Claude — Azure-hosted services, enterprise C# shops.

Getting started

dotnet add package Anthropic

Then:

using Anthropic;
using Anthropic.Models.Messages;

AnthropicClient client = new();

Things to know

Separate from ModelContextProtocol.* NuGet packages — `Anthropic` calls the Claude API; `ModelContextProtocol` builds MCP servers/clients.

Repository

anthropics/anthropic-sdk-csharp

Charted

2026-08-07

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