Update Context Summarization Notebook to clarify summary message handling and prevent model response errors by using SYSTEM messages instead of ASSISTANT messages.

Author: minh-hoque

examples/Context_summarization_with_realtime_api.ipynb

@@ -333,6 +333,14 @@
     "    return resp.choices[0].message.content.strip()"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Important implementation detail:\n",
+    "- The summary is appended as a SYSTEM message rather than an ASSISTANT message. Testing revealed that, during extended conversations, using ASSISTANT messages for summaries can cause the model to mistakenly switch from audio responses to text responses. By using SYSTEM messages for summaries (which can also include additional custom instructions), we clearly signal to the model that these are context-setting instructions, preventing it from incorrectly adopting the modality of the ongoing user-assistant interaction."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 11,
@@ -367,8 +375,8 @@
     "        \"item\": {\n",
     "            \"id\": summary_id,\n",
     "            \"type\": \"message\",\n",
-    "            \"role\": \"assistant\",\n",
-    "            \"content\": [{\"type\": \"text\", \"text\": summary_text}],\n",
+    "            \"role\": \"system\",\n",
+    "            \"content\": [{\"type\": \"input_text\", \"text\": summary_text}],\n",
     "        },\n",
     "    }))\n",
     "\n",