Cisharpai.Anthropic 0.2.2

There is a newer prerelease version of this package available.
See the version list below for details.

dotnet add package Cisharpai.Anthropic --version 0.2.2

NuGet\Install-Package Cisharpai.Anthropic -Version 0.2.2

This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.

<PackageReference Include="Cisharpai.Anthropic" Version="0.2.2" />

For projects that support PackageReference, copy this XML node into the project file to reference the package.

<PackageVersion Include="Cisharpai.Anthropic" Version="0.2.2" />
                    

                            Directory.Packages.props

<PackageReference Include="Cisharpai.Anthropic" />
                    

                            Project file

For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package.

paket add Cisharpai.Anthropic --version 0.2.2

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

#r "nuget: Cisharpai.Anthropic, 0.2.2"

#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.

#:package Cisharpai.Anthropic@0.2.2

#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package.

#addin nuget:?package=Cisharpai.Anthropic&version=0.2.2
                    

                            Install as a Cake Addin

#tool nuget:?package=Cisharpai.Anthropic&version=0.2.2
                    

                            Install as a Cake Tool

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

Cisharpai.Anthropic

Anthropic (Claude) provider for the Cisharpai unified LLM client library.

Features

Chat completions with all Claude models
JSON Mode (via system message injection) and Structured Outputs (output_config.format)
Tool calling with tool_use/tool_result content blocks
Vision (raw base64 image sources — PNG, JPEG, WebP, GIF)
Streaming (event-based SSE: message_start, content_block_delta, message_delta)
Refusal handling via stop_reason: "refusal"
Built-in HTTP resilience (retries, timeouts)

Quick Start

using Cisharpai;
using Cisharpai.Models;
using Cisharpai.Anthropic;
using Microsoft.Extensions.DependencyInjection;

var services = new ServiceCollection();
services.AddAnthropicClient(options =>
{
    options.ApiKey = "YOUR_API_KEY";
    options.DefaultModel = AnthropicModels.Chat.ClaudeSonnet4_5;
});

var provider = services.BuildServiceProvider();
var client = provider.GetRequiredService<IChatCompletionClient>();

var response = await client.GetChatCompletionAsync(
    new ChatCompletionRequest(
        Messages: [new LlmMessage(LlmRole.User, "Explain monads in one sentence.")],
        MaxTokens: 200));

Console.WriteLine(response.Content);

Available Models

ClaudeOpus4_5, ClaudeSonnet4_5, ClaudeHaiku4_5, ClaudeSonnet4, ClaudeHaiku4, ClaudeOpus3

Provider Notes

Anthropic uses raw base64 for images (not data URIs). The client handles this automatically when you use LlmMessage.WithImage() or WithBase64Image().
System messages are extracted from the message list and sent as the top-level system parameter.
Tool calling uses Anthropic's native tool_use/tool_result content block format.

Product	Compatible and additional computed target framework versions.
.NET	net8.0 is compatible. net8.0-android was computed. net8.0-browser was computed. net8.0-ios was computed. net8.0-maccatalyst was computed. net8.0-macos was computed. net8.0-tvos was computed. net8.0-windows was computed. net9.0 was computed. net9.0-android was computed. net9.0-browser was computed. net9.0-ios was computed. net9.0-maccatalyst was computed. net9.0-macos was computed. net9.0-tvos was computed. net9.0-windows was computed. net10.0 is compatible. net10.0-android was computed. net10.0-browser was computed. net10.0-ios was computed. net10.0-maccatalyst was computed. net10.0-macos was computed. net10.0-tvos was computed. net10.0-windows was computed.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version	Downloads	Last Updated
0.3.0-alpha.12.202	35	5/19/2026
0.3.0-alpha.11.197	44	5/15/2026
0.3.0-alpha.10.196	44	5/15/2026
0.3.0-alpha.9.186	56	5/8/2026
0.3.0-alpha.8.185	64	5/8/2026
0.3.0-alpha.7.164	51	5/6/2026
0.3.0-alpha.6.161	41	5/6/2026
0.3.0-alpha.5.159	42	5/6/2026
0.3.0-alpha.5.155	42	5/6/2026
0.3.0-alpha.4.156	45	5/6/2026
0.3.0-alpha.4.154	42	5/6/2026
0.3.0-alpha.3.150	45	4/30/2026
0.3.0-alpha.2.145	43	4/30/2026
0.2.2	90	4/30/2026
0.2.2-beta.1.147	46	4/30/2026
0.2.2-beta.1.146	46	4/30/2026
0.2.1	92	4/30/2026
0.2.1-beta.1.142	44	4/30/2026
0.2.1-beta.1.140	49	4/30/2026
0.2.1-beta.1.138	44	4/30/2026