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OpenAI C is an unofficial C client library for the OpenAI Chat API.
It provides a lightweight wrapper for calling ChatGPT (e.g. GPT-3.5 or GPT-4) using libcurl and cJSON.
If you prefer Make over CMake, a simple Makefile is also provided for manual builds and testing. However, CMake is the recommended build method.
- Lightweight C library for OpenAI Chat API
- Uses standard C with no runtime dependencies beyond libcurl and cJSON
- Suitable for embedded or low-level systems
- Optional example CLI program (openai_example)
- Easy installation with CMake
- Licensed under MIT
- libcurl development package
- cJSON development package
- CMake ≥ 3.10
- C compiler (C99 or later)
sudo apt install build-essential cmake libcurl4-openssl-dev libcjson-dev
git clone https://github.com/yourname/openai-c.git
cd openai-c
mkdir build
cd build
cmake ..
make
sudo make install
- libopenai.a → installed to /usr/local/lib
- openai.h → installed to /usr/local/include
You can build and run the optional example program:
Inside examples/chat.c:
#include "openai.h"
int main() {
openai_init("sk-...");
char* res = openai_chat_with_model("Hello, who are you?", "gpt-3.5-turbo");
if (res) {
printf("Response: %s\n", res);
free(res);
}
openai_cleanup();
return 0;
}
This project is licensed under the MIT.
