diff --git a/frontend/admin/package-lock.json b/frontend/admin/package-lock.json
index 2341e79..b50320e 100644
--- a/frontend/admin/package-lock.json
+++ b/frontend/admin/package-lock.json
@@ -9,6 +9,7 @@
       "version": "0.1.0",
       "dependencies": {
         "axios": "^1.6.0",
+        "openai": "^6.27.0",
         "vue": "^3.4.0",
         "vue-router": "^4.2.0"
       },
@@ -1438,6 +1439,27 @@
         "node": "^10 || ^12 || ^13.7 || ^14 || >=15.0.1"
       }
     },
+    "node_modules/openai": {
+      "version": "6.27.0",
+      "resolved": "https://registry.npmjs.org/openai/-/openai-6.27.0.tgz",
+      "integrity": "sha512-osTKySlrdYrLYTt0zjhY8yp0JUBmWDCN+Q+QxsV4xMQnnoVFpylgKGgxwN8sSdTNw0G4y+WUXs4eCMWpyDNWZQ==",
+      "license": "Apache-2.0",
+      "bin": {
+        "openai": "bin/cli"
+      },
+      "peerDependencies": {
+        "ws": "^8.18.0",
+        "zod": "^3.25 || ^4.0"
+      },
+      "peerDependenciesMeta": {
+        "ws": {
+          "optional": true
+        },
+        "zod": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/path-browserify": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/path-browserify/-/path-browserify-1.0.1.tgz",
diff --git a/frontend/admin/package.json b/frontend/admin/package.json
index 3ca81dc..59cad53 100644
--- a/frontend/admin/package.json
+++ b/frontend/admin/package.json
@@ -9,9 +9,10 @@
     "preview": "vite preview"
   },
   "dependencies": {
+    "axios": "^1.6.0",
+    "openai": "^6.27.0",
     "vue": "^3.4.0",
-    "vue-router": "^4.2.0",
-    "axios": "^1.6.0"
+    "vue-router": "^4.2.0"
   },
   "devDependencies": {
     "@vitejs/plugin-vue": "^5.0.0",
diff --git a/frontend/admin/src/router.ts b/frontend/admin/src/router.ts
index 2df7166..429f38d 100644
--- a/frontend/admin/src/router.ts
+++ b/frontend/admin/src/router.ts
@@ -1,5 +1,6 @@
 import { createRouter, createWebHistory } from 'vue-router'
 import Dashboard from './views/Dashboard.vue'
+import Chat from './views/Chat.vue'
 
 const router = createRouter({
   history: createWebHistory('/admin/'),
@@ -8,6 +9,11 @@ const router = createRouter({
       path: '/',
       name: 'dashboard',
       component: Dashboard
+    },
+    {
+      path: '/chat',
+      name: 'chat',
+      component: Chat
     }
   ]
 })
diff --git a/frontend/admin/src/views/Chat.vue b/frontend/admin/src/views/Chat.vue
new file mode 100644
index 0000000..1816062
--- /dev/null
+++ b/frontend/admin/src/views/Chat.vue
@@ -0,0 +1,550 @@
+<template>
+  <div class="chat-page">
+    <header class="header">
+      <div class="header-content">
+        <router-link to="/" class="back-link">← Dashboard</router-link>
+        <h1>Playground</h1>
+      </div>
+    </header>
+
+    <div class="chat-container">
+      <!-- Sidebar -->
+      <aside class="sidebar">
+        <div class="sidebar-section">
+          <label class="field-label">Model</label>
+          <select v-model="selectedModel" class="select-input" :disabled="modelsLoading">
+            <option v-if="modelsLoading" value="">Loading...</option>
+            <option v-for="m in models" :key="m.id" :value="m.id">
+              {{ m.id }}
+            </option>
+          </select>
+        </div>
+
+        <div class="sidebar-section">
+          <label class="field-label">System Instructions</label>
+          <textarea
+            v-model="instructions"
+            class="textarea-input"
+            rows="4"
+            placeholder="You are a helpful assistant..."
+          ></textarea>
+        </div>
+
+        <div class="sidebar-section">
+          <label class="field-label">Temperature</label>
+          <div class="slider-row">
+            <input type="range" v-model.number="temperature" min="0" max="2" step="0.1" class="slider" />
+            <span class="slider-value">{{ temperature }}</span>
+          </div>
+        </div>
+
+        <div class="sidebar-section">
+          <label class="field-label">Stream</label>
+          <label class="toggle">
+            <input type="checkbox" v-model="stream" />
+            <span class="toggle-slider"></span>
+          </label>
+        </div>
+
+        <button class="btn-clear" @click="clearChat">Clear Chat</button>
+      </aside>
+
+      <!-- Chat Area -->
+      <main class="chat-main">
+        <div class="messages" ref="messagesContainer">
+          <div v-if="messages.length === 0" class="empty-chat">
+            <p>Send a message to start chatting.</p>
+          </div>
+          <div
+            v-for="(msg, i) in messages"
+            :key="i"
+            :class="['message', `message-${msg.role}`]"
+          >
+            <div class="message-role">{{ msg.role }}</div>
+            <div class="message-content" v-html="renderContent(msg.content)"></div>
+          </div>
+          <div v-if="isLoading" class="message message-assistant">
+            <div class="message-role">assistant</div>
+            <div class="message-content">
+              <span class="typing-indicator">
+                <span></span><span></span><span></span>
+              </span>
+              {{ streamingText }}
+            </div>
+          </div>
+        </div>
+
+        <div class="input-area">
+          <textarea
+            v-model="userInput"
+            class="chat-input"
+            placeholder="Type a message..."
+            rows="1"
+            @keydown.enter.exact.prevent="sendMessage"
+            @input="autoResize"
+            ref="chatInputEl"
+          ></textarea>
+          <button class="btn-send" @click="sendMessage" :disabled="isLoading || !userInput.trim()">
+            Send
+          </button>
+        </div>
+      </main>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref, onMounted, nextTick } from 'vue'
+import OpenAI from 'openai'
+
+interface ChatMessage {
+  role: 'user' | 'assistant'
+  content: string
+}
+
+interface ModelOption {
+  id: string
+  provider: string
+}
+
+const models = ref<ModelOption[]>([])
+const modelsLoading = ref(true)
+const selectedModel = ref('')
+const instructions = ref('')
+const temperature = ref(1.0)
+const stream = ref(true)
+const userInput = ref('')
+const messages = ref<ChatMessage[]>([])
+const isLoading = ref(false)
+const streamingText = ref('')
+const lastResponseId = ref<string | null>(null)
+const messagesContainer = ref<HTMLElement | null>(null)
+const chatInputEl = ref<HTMLTextAreaElement | null>(null)
+
+const client = new OpenAI({
+  baseURL: `${window.location.origin}/v1`,
+  apiKey: 'unused',
+  dangerouslyAllowBrowser: true,
+})
+
+async function loadModels() {
+  try {
+    const resp = await fetch('/v1/models')
+    const data = await resp.json()
+    models.value = data.data || []
+    if (models.value.length > 0) {
+      selectedModel.value = models.value[0].id
+    }
+  } catch (e) {
+    console.error('Failed to load models:', e)
+  } finally {
+    modelsLoading.value = false
+  }
+}
+
+function scrollToBottom() {
+  nextTick(() => {
+    if (messagesContainer.value) {
+      messagesContainer.value.scrollTop = messagesContainer.value.scrollHeight
+    }
+  })
+}
+
+function autoResize(e: Event) {
+  const el = e.target as HTMLTextAreaElement
+  el.style.height = 'auto'
+  el.style.height = Math.min(el.scrollHeight, 150) + 'px'
+}
+
+function renderContent(content: string): string {
+  return content
+    .replace(/&/g, '&amp;')
+    .replace(/</g, '&lt;')
+    .replace(/>/g, '&gt;')
+    .replace(/\n/g, '<br>')
+}
+
+function clearChat() {
+  messages.value = []
+  lastResponseId.value = null
+  streamingText.value = ''
+}
+
+async function sendMessage() {
+  const text = userInput.value.trim()
+  if (!text || isLoading.value) return
+
+  messages.value.push({ role: 'user', content: text })
+  userInput.value = ''
+  if (chatInputEl.value) {
+    chatInputEl.value.style.height = 'auto'
+  }
+  scrollToBottom()
+
+  isLoading.value = true
+  streamingText.value = ''
+
+  try {
+    const params: Record<string, any> = {
+      model: selectedModel.value,
+      input: text,
+      temperature: temperature.value,
+      stream: stream.value,
+    }
+
+    if (instructions.value.trim()) {
+      params.instructions = instructions.value.trim()
+    }
+
+    if (lastResponseId.value) {
+      params.previous_response_id = lastResponseId.value
+    }
+
+    if (stream.value) {
+      const response = await client.responses.create(params as any)
+
+      // The SDK returns an async iterable for streaming
+      let fullText = ''
+      for await (const event of response as any) {
+        if (event.type === 'response.output_text.delta') {
+          fullText += event.delta
+          streamingText.value = fullText
+          scrollToBottom()
+        } else if (event.type === 'response.completed') {
+          lastResponseId.value = event.response.id
+        }
+      }
+
+      messages.value.push({ role: 'assistant', content: fullText })
+    } else {
+      const response = await client.responses.create(params as any) as any
+      lastResponseId.value = response.id
+
+      const text = response.output
+        ?.filter((item: any) => item.type === 'message')
+        ?.flatMap((item: any) => item.content)
+        ?.filter((part: any) => part.type === 'output_text')
+        ?.map((part: any) => part.text)
+        ?.join('') || ''
+
+      messages.value.push({ role: 'assistant', content: text })
+    }
+  } catch (e: any) {
+    messages.value.push({
+      role: 'assistant',
+      content: `Error: ${e.message || 'Failed to get response'}`,
+    })
+  } finally {
+    isLoading.value = false
+    streamingText.value = ''
+    scrollToBottom()
+  }
+}
+
+onMounted(() => {
+  loadModels()
+})
+</script>
+
+<style scoped>
+.chat-page {
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+  background-color: #f5f5f5;
+}
+
+.header {
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  color: white;
+  padding: 1rem 2rem;
+  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
+}
+
+.header-content {
+  display: flex;
+  align-items: center;
+  gap: 1.5rem;
+}
+
+.back-link {
+  color: rgba(255, 255, 255, 0.85);
+  text-decoration: none;
+  font-size: 0.95rem;
+}
+
+.back-link:hover {
+  color: white;
+}
+
+.header h1 {
+  font-size: 1.5rem;
+  font-weight: 600;
+}
+
+.chat-container {
+  flex: 1;
+  display: flex;
+  overflow: hidden;
+  height: calc(100vh - 65px);
+}
+
+/* Sidebar */
+.sidebar {
+  width: 280px;
+  background: white;
+  border-right: 1px solid #e2e8f0;
+  padding: 1.5rem;
+  display: flex;
+  flex-direction: column;
+  gap: 1.25rem;
+  overflow-y: auto;
+}
+
+.sidebar-section {
+  display: flex;
+  flex-direction: column;
+  gap: 0.5rem;
+}
+
+.field-label {
+  font-size: 0.8rem;
+  font-weight: 600;
+  color: #4a5568;
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+}
+
+.select-input {
+  padding: 0.5rem;
+  border: 1px solid #e2e8f0;
+  border-radius: 6px;
+  font-size: 0.875rem;
+  background: white;
+  color: #2d3748;
+}
+
+.textarea-input {
+  padding: 0.5rem;
+  border: 1px solid #e2e8f0;
+  border-radius: 6px;
+  font-size: 0.875rem;
+  resize: vertical;
+  font-family: inherit;
+  color: #2d3748;
+}
+
+.slider-row {
+  display: flex;
+  align-items: center;
+  gap: 0.75rem;
+}
+
+.slider {
+  flex: 1;
+  accent-color: #667eea;
+}
+
+.slider-value {
+  font-size: 0.875rem;
+  font-weight: 500;
+  color: #2d3748;
+  min-width: 2rem;
+  text-align: right;
+}
+
+.toggle {
+  position: relative;
+  width: 44px;
+  height: 24px;
+  cursor: pointer;
+}
+
+.toggle input {
+  opacity: 0;
+  width: 0;
+  height: 0;
+}
+
+.toggle-slider {
+  position: absolute;
+  inset: 0;
+  background-color: #cbd5e0;
+  border-radius: 24px;
+  transition: 0.2s;
+}
+
+.toggle-slider::before {
+  content: '';
+  position: absolute;
+  height: 18px;
+  width: 18px;
+  left: 3px;
+  bottom: 3px;
+  background-color: white;
+  border-radius: 50%;
+  transition: 0.2s;
+}
+
+.toggle input:checked + .toggle-slider {
+  background-color: #667eea;
+}
+
+.toggle input:checked + .toggle-slider::before {
+  transform: translateX(20px);
+}
+
+.btn-clear {
+  margin-top: auto;
+  padding: 0.5rem;
+  background: #fed7d7;
+  color: #742a2a;
+  border: none;
+  border-radius: 6px;
+  font-size: 0.875rem;
+  font-weight: 500;
+  cursor: pointer;
+}
+
+.btn-clear:hover {
+  background: #feb2b2;
+}
+
+/* Chat Main */
+.chat-main {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  min-width: 0;
+}
+
+.messages {
+  flex: 1;
+  overflow-y: auto;
+  padding: 1.5rem;
+  display: flex;
+  flex-direction: column;
+  gap: 1rem;
+}
+
+.empty-chat {
+  flex: 1;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  color: #a0aec0;
+  font-size: 1.1rem;
+}
+
+.message {
+  max-width: 80%;
+  padding: 0.75rem 1rem;
+  border-radius: 12px;
+  line-height: 1.5;
+}
+
+.message-user {
+  align-self: flex-end;
+  background: #667eea;
+  color: white;
+}
+
+.message-user .message-role {
+  color: rgba(255, 255, 255, 0.7);
+}
+
+.message-assistant {
+  align-self: flex-start;
+  background: white;
+  border: 1px solid #e2e8f0;
+  color: #2d3748;
+}
+
+.message-role {
+  font-size: 0.7rem;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+  margin-bottom: 0.25rem;
+  color: #a0aec0;
+}
+
+.message-content {
+  font-size: 0.95rem;
+  word-break: break-word;
+}
+
+/* Typing indicator */
+.typing-indicator {
+  display: inline-flex;
+  gap: 3px;
+  margin-right: 6px;
+}
+
+.typing-indicator span {
+  width: 6px;
+  height: 6px;
+  border-radius: 50%;
+  background: #a0aec0;
+  animation: bounce 1.2s infinite;
+}
+
+.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
+.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }
+
+@keyframes bounce {
+  0%, 60%, 100% { transform: translateY(0); }
+  30% { transform: translateY(-4px); }
+}
+
+/* Input Area */
+.input-area {
+  padding: 1rem 1.5rem;
+  background: white;
+  border-top: 1px solid #e2e8f0;
+  display: flex;
+  gap: 0.75rem;
+  align-items: flex-end;
+}
+
+.chat-input {
+  flex: 1;
+  padding: 0.75rem 1rem;
+  border: 1px solid #e2e8f0;
+  border-radius: 12px;
+  font-size: 0.95rem;
+  font-family: inherit;
+  resize: none;
+  color: #2d3748;
+  line-height: 1.4;
+  max-height: 150px;
+  overflow-y: auto;
+}
+
+.chat-input:focus {
+  outline: none;
+  border-color: #667eea;
+  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
+}
+
+.btn-send {
+  padding: 0.75rem 1.5rem;
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  color: white;
+  border: none;
+  border-radius: 12px;
+  font-size: 0.95rem;
+  font-weight: 500;
+  cursor: pointer;
+  white-space: nowrap;
+}
+
+.btn-send:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
+.btn-send:hover:not(:disabled) {
+  opacity: 0.9;
+}
+</style>
diff --git a/frontend/admin/src/views/Dashboard.vue b/frontend/admin/src/views/Dashboard.vue
index 4f73255..5b4896e 100644
--- a/frontend/admin/src/views/Dashboard.vue
+++ b/frontend/admin/src/views/Dashboard.vue
@@ -1,7 +1,10 @@
 <template>
   <div class="dashboard">
     <header class="header">
-      <h1>LLM Gateway Admin</h1>
+      <div class="header-row">
+        <h1>LLM Gateway Admin</h1>
+        <router-link to="/chat" class="nav-link">Playground →</router-link>
+      </div>
     </header>
 
     <div class="container">
@@ -168,11 +171,34 @@ onUnmounted(() => {
   box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
 }
 
+.header-row {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+}
+
 .header h1 {
   font-size: 2rem;
   font-weight: 600;
 }
 
+.nav-link {
+  color: rgba(255, 255, 255, 0.85);
+  text-decoration: none;
+  font-size: 1rem;
+  font-weight: 500;
+  padding: 0.5rem 1rem;
+  border: 1px solid rgba(255, 255, 255, 0.3);
+  border-radius: 8px;
+  transition: all 0.2s;
+}
+
+.nav-link:hover {
+  color: white;
+  border-color: rgba(255, 255, 255, 0.6);
+  background: rgba(255, 255, 255, 0.1);
+}
+
 .container {
   max-width: 1400px;
   margin: 0 auto;
diff --git a/frontend/admin/vite.config.ts b/frontend/admin/vite.config.ts
index c5182bd..0358ba8 100644
--- a/frontend/admin/vite.config.ts
+++ b/frontend/admin/vite.config.ts
@@ -11,6 +11,10 @@ export default defineConfig({
       '/admin/api': {
         target: 'http://localhost:8080',
         changeOrigin: true,
+      },
+      '/v1': {
+        target: 'http://localhost:8080',
+        changeOrigin: true,
       }
     }
   },
diff --git a/scripts/chat.py b/scripts/chat.py
index 83cf362..94d43ce 100755
--- a/scripts/chat.py
+++ b/scripts/chat.py
@@ -534,7 +534,7 @@ def main():
                     console.print(Markdown(response))
                 
             except APIStatusError as e:
-                console.print(f"[bold red]Error {e.status_code}:[/bold red] {e.message}")
+                console.print(f"[bold red]Error {e.status_code}:[/bold red] {str(e)}")
             except Exception as e:
                 console.print(f"[bold red]Error:[/bold red] {e}")