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Openai Cpp

Openai Cpp is a community-maintained, header-only C++ library that provides applications with methods for making requests to the OpenAI API. Its README describes a compact implementation using two headers, or one when the application already uses Nlohmann Json.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Openai Cpp — OpenViST project profile in AI Developer Tools & SDKs.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use it when a C++ application needs a small header-based client for OpenAI API requests and the project can meet the listed compiler and libcurl requirements.

Who it is for

C++ developers integrating OpenAI API requests into an application or utility.

Documented uses

  • Send completion and chat-completion requests from C++ code.
  • Call documented API functions for images, embeddings, files, fine-tuning, audio and moderation.
  • Use lower-level GET or POST methods to control requests when a convenience method is not provided.
Before you choose

Requirements & limits

The repository is public and identifies an MIT license. API use requires an OpenAI account secret key; the README recommends the OPENAI_API_KEY environment variable and also documents passing a key directly.

  • Requires a C++11, C++14, C++17 or C++20-compatible compiler and libcurl development package.
  • Uses Nlohmann Json, bundled with the project; the README allows using a separate copy.
  • The repository presents endpoint coverage as an implementation that may need updates as the OpenAI API changes.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Add the library headers to a C++ project

Prepare a project to include Openai Cpp’s client header.

Before you start

  • A C++11-, C++14-, C++17- or C++20-compatible compiler
  • libcurl, including its development package

Steps

  1. Copy the repository’s include/openai folder into the project.

  2. Include openai.hpp in the C++ source that will use the client.

  3. Use the bundled Nlohmann Json header, or provide your own copy.

Expected outcome

The project has the library headers available for inclusion in its C++ source.

Guide limitations

  • These steps cover adding the headers only; they do not build, run or verify an application.
  • Using the API also requires an OpenAI account secret key.
Documentation 1 ↗
Source-based practical guide

Configure a key and make the documented completion request

Initialize the client with an API key and request a completion using the README example.

Before you start

  • A C++ project with the library headers available
  • libcurl and a compatible C++ compiler
  • An OpenAI account secret key

Steps

  1. Set the OPENAI_API_KEY environment variable, as recommended in the README, or pass the key directly to the initialization function.

  2. Initialize the client with openai::start().

  3. Call openai::completion().create() with the documented JSON request and handle or print the returned response.

Expected outcome

The example is structured to send a completion request and print the API response.

Guide limitations

  • A successful request depends on a valid key and API access; this guide does not verify execution.
  • The README’s example uses a particular model and request format, which readers should check against the API documentation they plan to use.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
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Sources checked
15 October 2026
Original website title
olrea/openai-cpp · Official homepage title · retained in its source language
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