Updated list of voices

https://platform.openai.com/docs/api-reference/chat/create#chat-create-audio says:

> The voice the model uses to respond. Supported voices are ash, ballad, coral, sage, and verse (also supported but not recommended are alloy, echo, and shimmer; these voices are less expressive).

Author: simonw

openai-audio-output.html

@@ -146,14 +146,19 @@ <h1>Prompt GPT-4o audio</h1>
                 <option value="gpt-4o-audio-preview-2024-12-17">GPT-4o Audio Preview (Dec 17, 2024)</option>
                 <option value="gpt-4o-audio-preview-2024-10-01">GPT-4o Audio Preview (Oct 1, 2024)</option>
             </select>
-            
             <select id="voiceSelect" aria-label="Voice selection">
-                <option value="alloy">Alloy</option>
-                <option value="echo">Echo</option>
-                <option value="fable">Fable</option>
-                <option value="onyx">Onyx</option>
-                <option value="nova">Nova</option>
-                <option value="shimmer">Shimmer</option>
+                <optgroup label="Recommended voices">
+                    <option value="ash">Ash</option>
+                    <option value="ballad">Ballad</option>
+                    <option value="coral">Coral</option>
+                    <option value="sage">Sage</option>
+                    <option value="verse">Verse</option>
+                </optgroup>
+                <optgroup label="Less expressive">
+                    <option value="alloy">Alloy</option>
+                    <option value="echo">Echo</option>
+                    <option value="shimmer">Shimmer</option>
+                </optgroup>
             </select>
         </div>
         <button id="submitBtn">Generate Speech</button>