The AI Toolkit for Modern C++. From the engineers at ClickHouse, ai-sdk-cpp is a free, open‑source library for building AI‑powered applications and agents.

AI SDK CPP

The AI SDK CPP is a modern C++ toolkit designed to help you build AI-powered applications with popular model providers like OpenAI and Anthropic. It provides a unified, easy-to-use API that abstracts away the complexity of different provider implementations.

Motivation

C++ developers have long lacked a first-class, convenient way to interact with modern AI services like OpenAI, Anthropic, and others. AI SDK CPP bridges this gap by providing:

• Unified API: Work with multiple AI providers through a single, consistent interface
• Modern C++: Built with C++20 features for clean, expressive code
• Minimal Dependencies: Minimal external dependencies for easy integration

Installation

You will need a C++20 compatible compiler and CMake 3.16+ installed on your development machine.

Usage

Core API

The AI SDK CPP Core module provides a unified API to interact with model providers like OpenAI and Anthropic.

OpenAI Integration

#include <ai/openai.h>
#include <ai/generate.h>
#include <iostream>

int main() {
    // Ensure OPENAI_API_KEY environment variable is set
    auto client = ai::openai::create_client();
    
    auto result = client.generate_text({
        .model = ai::openai::models::kGpt4o, // this can also be a string like "gpt-4o"
        .system = "You are a friendly assistant!",
        .prompt = "Why is the sky blue?"
    });
    
    if (result) {
        std::cout << result->text << std::endl;
    }
    
    return 0;
}

Anthropic Integration

#include <ai/anthropic.h>
#include <ai/generate.h>
#include <iostream>

int main() {
    // Ensure ANTHROPIC_API_KEY environment variable is set
    auto client = ai::anthropic::create_client();
    auto result = client.generate_text({
        .model = ai::anthropic::models::kClaudeSonnet45,
        .system = "You are a helpful assistant.",
        .prompt = "Explain quantum computing in simple terms."
    });

    if (result) {
        std::cout <<