diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8392e51..731f7ef 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,10 +10,14 @@ set(CMAKE_AUTOMOC OFF)
 set(CMAKE_AUTORCC ON)
 set(CMAKE_AUTOUIC ON)
 
-find_package(Qt6 REQUIRED COMPONENTS Widgets)
+find_package(Qt6 REQUIRED COMPONENTS Widgets Network)
 
 qt_add_executable(QtDesktopPet
     main.cpp
+    src/ai/LLMProvider.h
+    src/ai/LLMTypes.h
+    src/ai/OpenAICompatibleProvider.h
+    src/ai/OpenAICompatibleProvider.cpp
     src/character/AnimationClip.h
     src/character/AnimationClip.cpp
     src/character/CharacterPackage.h
@@ -52,6 +56,7 @@ target_compile_definitions(QtDesktopPet
 
 target_link_libraries(QtDesktopPet
     PRIVATE
+        Qt6::Network
         Qt6::Widgets
 )
 
diff --git a/src/ai/LLMProvider.h b/src/ai/LLMProvider.h
new file mode 100644
index 0000000..d7e0349
--- /dev/null
+++ b/src/ai/LLMProvider.h
@@ -0,0 +1,17 @@
+#pragma once
+
+#include "LLMTypes.h"
+
+#include <functional>
+
+class LLMProvider
+{
+public:
+    using ResponseCallback = std::function<void(const ChatResponse &)>;
+
+    virtual ~LLMProvider() = default;
+
+    virtual bool isBusy() const = 0;
+    virtual void sendChatRequest(const ChatRequest &request, ResponseCallback callback) = 0;
+    virtual void cancel() = 0;
+};
diff --git a/src/ai/LLMTypes.h b/src/ai/LLMTypes.h
new file mode 100644
index 0000000..5493280
--- /dev/null
+++ b/src/ai/LLMTypes.h
@@ -0,0 +1,23 @@
+#pragma once
+
+#include <QString>
+#include <QVector>
+
+struct ChatMessage
+{
+    QString role;
+    QString content;
+};
+
+struct ChatRequest
+{
+    QVector<ChatMessage> messages;
+};
+
+struct ChatResponse
+{
+    bool success = false;
+    QString content;
+    QString errorMessage;
+    int httpStatus = 0;
+};
diff --git a/src/ai/OpenAICompatibleProvider.cpp b/src/ai/OpenAICompatibleProvider.cpp
new file mode 100644
index 0000000..5f38707
--- /dev/null
+++ b/src/ai/OpenAICompatibleProvider.cpp
@@ -0,0 +1,205 @@
+#include "OpenAICompatibleProvider.h"
+
+#include <QJsonArray>
+#include <QJsonDocument>
+#include <QJsonObject>
+#include <QJsonParseError>
+#include <QNetworkReply>
+#include <QNetworkRequest>
+#include <QUrl>
+
+#include <utility>
+
+OpenAICompatibleProvider::OpenAICompatibleProvider(const AIConfig &config)
+    : m_config(config)
+{
+    m_timeoutTimer.setSingleShot(true);
+    QObject::connect(&m_timeoutTimer, &QTimer::timeout, [this]() {
+        finishWithError(QStringLiteral("AI request timed out."));
+    });
+}
+
+OpenAICompatibleProvider::~OpenAICompatibleProvider()
+{
+    cancel();
+}
+
+bool OpenAICompatibleProvider::isBusy() const
+{
+    return !m_currentReply.isNull();
+}
+
+void OpenAICompatibleProvider::sendChatRequest(const ChatRequest &request, ResponseCallback callback)
+{
+    if (isBusy())
+    {
+        if (callback)
+        {
+            callback({false, {}, QStringLiteral("AI request is already running."), 0});
+        }
+        return;
+    }
+
+    if (m_config.baseUrl.trimmed().isEmpty())
+    {
+        if (callback)
+        {
+            callback({false, {}, QStringLiteral("Base URL is empty."), 0});
+        }
+        return;
+    }
+
+    if (m_config.model.trimmed().isEmpty())
+    {
+        if (callback)
+        {
+            callback({false, {}, QStringLiteral("Model is empty."), 0});
+        }
+        return;
+    }
+
+    if (m_config.apiKey.trimmed().isEmpty())
+    {
+        if (callback)
+        {
+            callback({false, {}, QStringLiteral("API Key is empty."), 0});
+        }
+        return;
+    }
+
+    m_callback = std::move(callback);
+
+    QNetworkRequest networkRequest(requestUrl());
+    networkRequest.setHeader(QNetworkRequest::ContentTypeHeader, QStringLiteral("application/json"));
+    networkRequest.setRawHeader("Authorization", QByteArray("Bearer ") + m_config.apiKey.toUtf8());
+
+    const QJsonDocument document(buildPayload(request));
+    m_currentReply = m_networkManager.post(networkRequest, document.toJson(QJsonDocument::Compact));
+    QObject::connect(m_currentReply, &QNetworkReply::finished, [this]() {
+        if (m_currentReply.isNull())
+        {
+            return;
+        }
+
+        QNetworkReply *reply = m_currentReply;
+        const QByteArray body = reply->readAll();
+        ChatResponse response = parseResponse(reply, body);
+        clearReply();
+
+        if (m_callback)
+        {
+            const ResponseCallback callback = std::move(m_callback);
+            m_callback = nullptr;
+            callback(response);
+        }
+    });
+
+    m_timeoutTimer.start(m_config.timeoutMs);
+}
+
+void OpenAICompatibleProvider::cancel()
+{
+    if (!m_currentReply.isNull())
+    {
+        m_currentReply->abort();
+    }
+
+    clearReply();
+    m_callback = nullptr;
+}
+
+QJsonObject OpenAICompatibleProvider::buildPayload(const ChatRequest &request) const
+{
+    QJsonArray messages;
+    for (const ChatMessage &message : request.messages)
+    {
+        QJsonObject item;
+        item.insert(QStringLiteral("role"), message.role);
+        item.insert(QStringLiteral("content"), message.content);
+        messages.append(item);
+    }
+
+    QJsonObject payload;
+    payload.insert(QStringLiteral("model"), m_config.model);
+    payload.insert(QStringLiteral("messages"), messages);
+    payload.insert(QStringLiteral("stream"), false);
+    payload.insert(QStringLiteral("temperature"), m_config.temperature);
+    payload.insert(QStringLiteral("max_tokens"), m_config.maxTokens);
+    return payload;
+}
+
+QUrl OpenAICompatibleProvider::requestUrl() const
+{
+    QString baseUrl = m_config.baseUrl.trimmed();
+    QString path = m_config.path.trimmed();
+
+    while (baseUrl.endsWith(QLatin1Char('/')))
+    {
+        baseUrl.chop(1);
+    }
+
+    if (!path.startsWith(QLatin1Char('/')))
+    {
+        path.prepend(QLatin1Char('/'));
+    }
+
+    return QUrl(baseUrl + path);
+}
+
+ChatResponse OpenAICompatibleProvider::parseResponse(QNetworkReply *reply, const QByteArray &body) const
+{
+    const int httpStatus = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
+    if (reply->error() != QNetworkReply::NoError)
+    {
+        return {false, {}, reply->errorString(), httpStatus};
+    }
+
+    QJsonParseError parseError;
+    const QJsonDocument document = QJsonDocument::fromJson(body, &parseError);
+    if (parseError.error != QJsonParseError::NoError || !document.isObject())
+    {
+        return {false, {}, QStringLiteral("AI response is not valid JSON."), httpStatus};
+    }
+
+    const QJsonObject root = document.object();
+    const QJsonArray choices = root.value(QStringLiteral("choices")).toArray();
+    if (choices.isEmpty() || !choices.first().isObject())
+    {
+        return {false, {}, QStringLiteral("AI response has no choices."), httpStatus};
+    }
+
+    const QJsonObject message = choices.first().toObject().value(QStringLiteral("message")).toObject();
+    const QString content = message.value(QStringLiteral("content")).toString();
+    if (content.isEmpty())
+    {
+        return {false, {}, QStringLiteral("AI response content is empty."), httpStatus};
+    }
+
+    return {true, content, {}, httpStatus};
+}
+
+void OpenAICompatibleProvider::finishWithError(const QString &message, int httpStatus)
+{
+    if (!m_currentReply.isNull())
+    {
+        m_currentReply->abort();
+    }
+
+    clearReply();
+    if (m_callback)
+    {
+        const ResponseCallback callback = std::move(m_callback);
+        m_callback = nullptr;
+        callback({false, {}, message, httpStatus});
+    }
+}
+
+void OpenAICompatibleProvider::clearReply()
+{
+    m_timeoutTimer.stop();
+    if (!m_currentReply.isNull())
+    {
+        m_currentReply->deleteLater();
+        m_currentReply.clear();
+    }
+}
diff --git a/src/ai/OpenAICompatibleProvider.h b/src/ai/OpenAICompatibleProvider.h
new file mode 100644
index 0000000..0aac389
--- /dev/null
+++ b/src/ai/OpenAICompatibleProvider.h
@@ -0,0 +1,36 @@
+#pragma once
+
+#include "LLMProvider.h"
+#include "../config/AIConfig.h"
+
+#include <QJsonObject>
+#include <QNetworkAccessManager>
+#include <QPointer>
+#include <QTimer>
+#include <QUrl>
+
+class QNetworkReply;
+
+class OpenAICompatibleProvider : public LLMProvider
+{
+public:
+    explicit OpenAICompatibleProvider(const AIConfig &config);
+    ~OpenAICompatibleProvider() override;
+
+    bool isBusy() const override;
+    void sendChatRequest(const ChatRequest &request, ResponseCallback callback) override;
+    void cancel() override;
+
+private:
+    QJsonObject buildPayload(const ChatRequest &request) const;
+    QUrl requestUrl() const;
+    ChatResponse parseResponse(QNetworkReply *reply, const QByteArray &body) const;
+    void finishWithError(const QString &message, int httpStatus = 0);
+    void clearReply();
+
+    AIConfig m_config;
+    QNetworkAccessManager m_networkManager;
+    QPointer<QNetworkReply> m_currentReply;
+    QTimer m_timeoutTimer;
+    ResponseCallback m_callback;
+};