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Java client library for OpenAI API.Full support for all OpenAI API models including Completions, Chat, Edits, Embeddings, Audio, Files, Assistants-v2, Images, Moderations, Batch, and Fine-tuning.
| Date | Stars |
|---|---|
| 2026-07-31 | 375 |
| 2026-08-05 | 374 |
| 2026-08-06 | 374 |
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# OpenAi4J
OpenAi4J is an unofficial Java library tailored to facilitate the interaction with OpenAI's GPT models, including the
newest additions such as gpt4-turbo vision,assistant-v2. Originally forked from TheoKanning/openai-java, this library
continues development to incorporate latest API features after the original project's maintenance was discontinued.
[中文介绍☕](README-zh.md)
## Features
- Full support for all OpenAI API models including Completions, Chat, Edits, Embeddings, Audio, Files, Assistants-v2,
Images, Moderations, Batch, and Fine-tuning.
- Easy-to-use client setup with Retrofit for immediate API interaction.
- Extensive examples and documentation to help you start quickly.
- Customizable setup with environment variable integration for API keys and base URLs.
- Supports synchronous and asynchronous API calls.
This library aims to provide Java developers with a robust tool to integrate OpenAI's powerful capabilities into their
applications effortlessly.
# Quick Start
## Import
### Gradle
`implementation 'io.github.lambdua:<api|client|service>:0.22.92'`
### Maven
```xml
<dependency>
<groupId>io.github.lambdua</groupId>
<artifactId>service</artifactId>
<version>0.22.92</version>
</dependency>
```
## chat with OpenAi model
```java
static void simpleChat() {
//api-key get from environment variable OPENAI_API_KEY
OpenAiService service = new OpenAiService(Duration.ofSeconds(30));
List<ChatMessage> messages = new ArrayList<>();
ChatMessage systemMessage = new SystemMessage("You are a cute cat and will speak as such.");
messages.add(systemMessage);
ChatCompletionRequest chatCompletionRequest = ChatCompletionRequest.builder()
.model("gpt-4o-mini")
.messages(messages)
.n(1)
.maxTokens(50)
.build();
ChatCompletionResult chatCompletion = service.createChatCompletion(chatCompletionRequest);
System.out.println(chatCompletion.getChoices().get(0).getMessage().getContent());
}
```
# Just Using POJO
If you wish to develop your own client, simply import POJOs from the api module.</br>
Ensure your client adopts snake case naming for compatibility with the OpenAI API.
To utilize pojos, import the api module:
```xml
<dependency>
<groupId>io.github.lambdua</groupId>
<artifactId>api</artifactId>
<version>0.22.92</version>
</dependency>
```
# other examples:
The sample code is all in the `example` package, which includes most of the functional usage. </br>
You can refer to the code in the example package. Below are some commonly used feature usage examples
<details>
<summary>gpt-vision image recognition</summary>
```java
static void gptVision() {
OpenAiService service = new OpenAiService(Duration.ofSeconds(20));
final List<ChatMessage> messages = new ArrayList<>();
final ChatMessage systemMessage = new SystemMessage("You are a helpful assistant.");
//Here, the imageMessage is intended for image recognition
final ChatMessage imageMessage = UserMessage.buildImageMessage("What's in this image?",
"https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Gfp-wisconsin-madison-the-nature-boardwalk.jpg/2560px-Gfp-wisconsin-madison-the-nature-boardwalk.jpg");
messages.add(systemMessage);
messages.add(imageMessage);
ChatCompletionRequest chatCompletionRequest = ChatCompletionRequest.builder()
.model("gpt-4-turbo")
.messages(messages)
.n(1)
.maxTokens(200)
.build();
ChatCompletionChoice choice = service.createChatCompletion(chatCompletionRequest).getChoices().get(0);
System.out.println(choice.getMessage().getContent());
}
```
</details>
<details>
<summary>Customizing OpenAiService</summary>
OpenAiService is versatile in its setup options, as demonstrated in the `example.ServiceCreateExample` within the example package.
```java
//0 Using the default configuration, read tExcerpt of 28,649 characters
Read on GitHubWould you bet a product on this? Bounded 0–100 and slow moving.
matched fp:a2272536e15f5cf0, llm:Repository description: 'Java client library for OpenAI API. Full support for all OpenAI API models including Completions, Chat, Edits, Embeddings, Audio, Files, Assistants-v2, Images, Moderations, Batch, and Fine-tuning.' Topics include openai, chatgpt, assistants-api, embeddings, openai-api-chatbot, openai-whisper.
matched fp:a2272536e15f5cf0, llm:Repository description: 'Java client library for OpenAI API. Full support for all OpenAI API models including Completions, Chat, Edits, Embeddings, Audio, Files, Assistants-v2, Images, Moderations, Batch, and Fine-tuning.' Topics include openai, chatgpt, assistants-api, embeddings, openai-api-chatbot, openai-whisper.
matched fp:a2272536e15f5cf0, llm:Repository description: 'Java client library for OpenAI API. Full support for all OpenAI API models including Completions, Chat, Edits, Embeddings, Audio, Files, Assistants-v2, Images, Moderations, Batch, and Fine-tuning.' Topics include openai, chatgpt, assistants-api, embeddings, openai-api-chatbot, openai-whisper.