I did some things

.gitignore

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+.settings
+.classpath
+.project
+target
+*.properties

pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>de.derpandaa</groupId>
+  <artifactId>ai-testsuit</artifactId>
+  <version>0.0.1-SNAPSHOT</version>
+  <properties>
+		<qtjambi.version>6.10.0</qtjambi.version>
+		<jackson.version>3.0.3</jackson.version>
+	</properties>
+  <dependencies>
+		<dependency>
+			<groupId>io.qtjambi</groupId>
+			<artifactId>qtjambi</artifactId>
+			<version>${qtjambi.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>io.qtjambi</groupId>
+			<artifactId>qtjambi-native-linux-x64</artifactId>
+			<version>${qtjambi.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>tools.jackson.core</groupId>
+			<artifactId>jackson-core</artifactId>
+			<version>${jackson.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>tools.jackson.core</groupId>
+			<artifactId>jackson-databind</artifactId>
+			<version>${jackson.version}</version>
+		</dependency>
+	</dependencies>
+</project>

src/main/java/de/derpandaa/aitestsuit/AiWindow.java

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+package de.derpandaa.aitestsuit;
+
+import io.qt.widgets.QApplication;
+import io.qt.widgets.QBoxLayout;
+import io.qt.widgets.QLabel;
+import io.qt.widgets.QMainWindow;
+import io.qt.widgets.QPushButton;
+import io.qt.widgets.QTextEdit;
+import io.qt.widgets.QVBoxLayout;
+import io.qt.widgets.QWidget;
+
+public class AiWindow {
+
+
+	public static void main(String[] args) {
+		QApplication.initialize(args);
+		QMainWindow window = new QMainWindow();
+		QWidget widget = new QWidget();
+		QBoxLayout layout = new QVBoxLayout();
+
+		QLabel labelSystemPrompt = new QLabel("System Prompt");
+		layout.addWidget(labelSystemPrompt);
+
+		QTextEdit editSystemPrompt = new QTextEdit();
+		layout.addWidget(editSystemPrompt);
+
+		QLabel labelUserPrompt = new QLabel("User Prompt");
+		layout.addWidget(labelUserPrompt);
+
+		QTextEdit editUserPrompt = new QTextEdit();
+		layout.addWidget(editUserPrompt);
+
+		QLabel labelAiAnswer = new QLabel("Ai Answer");
+		layout.addWidget(labelAiAnswer);
+
+		QTextEdit editAiAnser = new QTextEdit();
+		editAiAnser.setEnabled(false);
+		layout.addWidget(editAiAnser);
+
+		QPushButton buttonRun = new QPushButton("Run");
+		buttonRun.clicked.connect(() -> {
+			String result = ChatGPTApiWrapper.run(editSystemPrompt.getPlainText(), editUserPrompt.getPlainText());
+			editAiAnser.setText(result);
+		});
+
+		layout.addWidget(buttonRun);
+
+		widget.setLayout(layout);
+
+		window.setCentralWidget(widget);
+		window.show();
+		QApplication.exec();
+		QApplication.shutdown();
+	}
+
+}

src/main/java/de/derpandaa/aitestsuit/ChatGPTApiWrapper.java

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+package de.derpandaa.aitestsuit;
+
+import java.io.IOException;
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+
+import de.derpandaa.aitestsuit.MessageDto.Role;
+import de.derpandaa.aitestsuit.OpenAiDto.Model;
+import tools.jackson.databind.JsonNode;
+import tools.jackson.databind.ObjectMapper;
+
+/*
+ * I dont know how to name it
+ */
+public class ChatGPTApiWrapper {
+
+	public static String API_KEY;
+
+	public static String run(String systemPrompt, String userPrompt) {
+		OpenAiDto dto = new OpenAiDto(Model.gpt5nano, new MessageDto(Role.system, systemPrompt),
+				new MessageDto(Role.user, userPrompt));
+		return run(dto);
+	}
+
+	public static String run(OpenAiDto dto) {
+		ObjectMapper mapper = new ObjectMapper();
+		String jsonBody = mapper.writeValueAsString(dto);
+
+		System.out.println(jsonBody);
+		HttpRequest request = HttpRequest.newBuilder().uri(URI.create("https://api.openai.com/v1/chat/completions"))
+				.header("Content-Type", "application/json").header("Authorization", "Bearer " + API_KEY)
+				.POST(HttpRequest.BodyPublishers.ofString(jsonBody)).build();
+
+		HttpClient client = HttpClient.newHttpClient();
+		try {
+			HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
+			System.out.println(response.statusCode());
+			System.out.println(response.body());
+			JsonNode root = mapper.readTree(response.body());
+			return root.path("choices").path(0).path("message").path("content").asString();
+		} catch (IOException | InterruptedException e) {
+			// NOOP
+		}
+		return "";
+	}
+}
+

src/main/java/de/derpandaa/aitestsuit/ChatWindow.java

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+package de.derpandaa.aitestsuit;
+
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.Properties;
+
+import de.derpandaa.aitestsuit.MessageDto.Role;
+import de.derpandaa.aitestsuit.OpenAiDto.Model;
+import io.qt.core.Qt.AlignmentFlag;
+import io.qt.gui.QColor;
+import io.qt.gui.QPalette;
+import io.qt.widgets.QApplication;
+import io.qt.widgets.QBoxLayout;
+import io.qt.widgets.QComboBox;
+import io.qt.widgets.QFrame;
+import io.qt.widgets.QHBoxLayout;
+import io.qt.widgets.QLabel;
+import io.qt.widgets.QLineEdit;
+import io.qt.widgets.QMainWindow;
+import io.qt.widgets.QPushButton;
+import io.qt.widgets.QScrollArea;
+import io.qt.widgets.QVBoxLayout;
+import io.qt.widgets.QWidget;
+
+public class ChatWindow extends QMainWindow {
+
+	private QBoxLayout layout;
+	private QVBoxLayout chatLayout;
+	private QWidget chatWidget;
+	private QLineEdit textInput;
+	private OpenAiDto openAiDto;
+	private QComboBox modelComboBox;
+
+	public ChatWindow() {
+		super();
+		openAiDto = new OpenAiDto(Model.gpt5_2, new MessageDto(Role.system, "Antworte kurz und präzise"));
+
+		QWidget widget = new QWidget();
+		layout = new QVBoxLayout();
+		layout.setContentsMargins(10, 10, 10, 10);
+
+		QPushButton button = new QPushButton("Import Chat");
+		layout.addWidget(button);
+
+		modelComboBox = new QComboBox();
+		for (OpenAiDto.Model m : OpenAiDto.Model.values()) {
+			modelComboBox.addItem(m.toString(), m);
+		}
+		layout.addWidget(modelComboBox);
+
+		QScrollArea scrollArea = new QScrollArea();
+		scrollArea.setWidgetResizable(true);
+
+		chatWidget = new QWidget();
+		chatLayout = new QVBoxLayout(chatWidget);
+		chatLayout.setAlignment(AlignmentFlag.AlignTop);
+		chatLayout.setSpacing(5);
+
+		scrollArea.setWidget(chatWidget);
+		layout.addWidget(scrollArea);
+
+		QHBoxLayout inputLayout = new QHBoxLayout();
+		textInput = new QLineEdit();
+		textInput.setPlaceholderText("Nachricht eingeben...");
+		QPushButton sendButton = new QPushButton("Senden");
+		sendButton.clicked.connect(() -> sendMessage());
+
+		inputLayout.addWidget(textInput);
+		inputLayout.addWidget(sendButton);
+		layout.addLayout(inputLayout);
+
+		widget.setLayout(layout);
+		setCentralWidget(widget);
+		resize(600, 500);
+		show();
+	}
+
+	private void importChat(OpenAiDto openAiDto) {
+		for (MessageDto messageDto : openAiDto.getMessages()) {
+//			chatLayout.addWidget(createMessage(messageDto.getContent(), true));
+		}
+	}
+
+	private QWidget createMessage(String message, Role role) {
+		QFrame frame = new QFrame();
+		frame.setFrameShape(QFrame.Shape.Box);
+		frame.setFrameShadow(QFrame.Shadow.Raised);
+
+//		frame.setMaximumWidth(Integer.MAX_VALUE);
+//		frame.setSizePolicy(QSizePolicy.Policy.Maximum, QSizePolicy.Policy.Preferred);
+
+		QVBoxLayout frameLayout = new QVBoxLayout(frame);
+
+		frameLayout.setContentsMargins(10, 10, 10, 10);
+		QLabel textLabel = new QLabel(message);
+		textLabel.setWordWrap(true);
+		frameLayout.addWidget(textLabel);
+
+		QWidget container = new QWidget();
+		QHBoxLayout boxLayout = new QHBoxLayout(container);
+		boxLayout.setContentsMargins(0, 0, 0, 0);
+
+		QPalette palette = frame.palette();
+		QColor messageColor;
+
+		switch (role) {
+			case user:
+				messageColor = new QColor(209, 114, 246);
+				boxLayout.addStretch(30);
+				boxLayout.addWidget(frame, 70);
+				break;
+			case assistant:
+				messageColor = new QColor(106, 91, 117);
+				boxLayout.addWidget(frame, 70);
+				boxLayout.addStretch(30);
+				break;
+			default:
+				messageColor = new QColor(100, 100, 100);
+				boxLayout.addStretch(15);
+				boxLayout.addWidget(frame, 70);
+				boxLayout.addStretch(15);
+				break;
+		}
+		palette.setColor(QPalette.ColorRole.Window, messageColor);
+		frame.setAutoFillBackground(true);
+		frame.setPalette(palette);
+		return container;
+	}
+
+	private void sendMessage() {
+		String message = textInput.text().trim();
+
+		if (message.isEmpty()) {
+			return;
+		}
+		openAiDto.setModel((Model) modelComboBox.currentData());
+
+		MessageDto messageDto = new MessageDto(Role.user, message);
+		openAiDto.addMessage(messageDto);
+
+		chatLayout.addWidget(createMessage(message, Role.user));
+
+		textInput.clear();
+		chatWidget.adjustSize();
+		
+		String answer = ChatGPTApiWrapper.run(openAiDto);
+
+		openAiDto.addMessage(new MessageDto(Role.assistant, answer));
+		chatLayout.addWidget(createMessage(answer, Role.assistant));
+	}
+
+	public static void main(String[] args) {
+		QApplication.initialize(args);
+		initProperties();
+		ChatWindow window = new ChatWindow();
+
+		QApplication.exec();
+		QApplication.shutdown();
+	}
+
+	private static void initProperties() {
+		Properties properties = new Properties();
+		try {
+			properties.load(new FileInputStream("ai.properties"));
+		} catch (FileNotFoundException e) {
+			System.out.println("[ERROR] No Properties File");
+			System.exit(1);
+		} catch (IOException e) {
+			System.out.println("[ERROR] Cannot Access File");
+			System.exit(1);
+		}
+		ChatGPTApiWrapper.API_KEY = properties.getProperty("OPENAI_KEY");
+	}
+}

src/main/java/de/derpandaa/aitestsuit/MessageDto.java

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+package de.derpandaa.aitestsuit;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+public class MessageDto {
+
+	public enum Role {
+		system, user, assistant
+	};
+
+	@JsonProperty("role")
+	private Role role;
+	@JsonProperty("content")
+	private String content;
+
+	public MessageDto(Role role, String content) {
+		this.role = role;
+		this.content = content;
+	}
+
+	public String getContent() {
+		return content;
+	}
+
+}

src/main/java/de/derpandaa/aitestsuit/OpenAiDto.java

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+package de.derpandaa.aitestsuit;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+public class OpenAiDto {
+
+	public enum Model {
+		gpt5nano("gpt-5-nano"),
+		gpt5mini("gpt-5-mini"),
+		gpt5_2("gpt-5.2");
+
+		final String value;
+
+		Model(String value) {
+			this.value = value;
+		}
+
+		@Override
+		public String toString() {
+			return value;
+		}
+	}
+
+	@JsonProperty("model")
+	private Model model;
+
+	@JsonProperty("messages")
+	private List<MessageDto> messages;
+
+	public OpenAiDto(Model model, MessageDto... messages) {
+		this.model = model;
+		this.messages = new ArrayList<MessageDto>();
+		this.messages.addAll(Arrays.asList(messages));
+	}
+
+	public void addMessage(MessageDto messageDto) {
+		messages.add(messageDto);
+	}
+
+	public List<MessageDto> getMessages() {
+		return messages;
+	}
+
+	public void setModel(Model model) {
+		this.model = model;
+	}
+
+}