docs[patch]: Adds ChatOpenAI streamUsage docs on disabling stream usa…

…ge (#6534)

* Adds ChatOpenAI streamUsage docs on disabling stream usage

* Fix notebook

docs/core_docs/docs/integrations/chat/openai.ipynb

@@ -305,6 +305,36 @@
     "await llmWithCustomHeaders.invoke(\"Hi there!\");"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "7af61d1d",
+   "metadata": {},
+   "source": [
+    "## Disabling streaming usage metadata\n",
+    "\n",
+    "Some proxies or third-party providers present largely the same API interface as OpenAI, but don't support the more recently added `stream_options` parameter to return streaming usage. You can use `ChatOpenAI` to access these providers by disabling streaming usage like this:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "0ff40bd7",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import { ChatOpenAI } from \"@langchain/openai\";\n",
+    "\n",
+    "const llmWithoutStreamUsage = new ChatOpenAI({\n",
+    "  temperature: 0.9,\n",
+    "  streamUsage: false,\n",
+    "  configuration: {\n",
+    "    baseURL: \"https://proxy.com\",\n",
+    "  },\n",
+    "});\n",
+    "\n",
+    "await llmWithoutStreamUsage.invoke(\"Hi there!\");"
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "013b6300",