langchain/docs/extras/modules/callbacks/token_counting.ipynb

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    "# Token counting\n",
    "LangChain offers a context manager that allows you to count tokens."
   ]
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    "import asyncio\n",
    "\n",
    "from langchain.callbacks import get_openai_callback\n",
    "from langchain.llms import OpenAI\n",
    "\n",
    "llm = OpenAI(temperature=0)\n",
    "with get_openai_callback() as cb:\n",
    "    llm(\"What is the square root of 4?\")\n",
    "\n",
    "total_tokens = cb.total_tokens\n",
    "assert total_tokens > 0\n",
    "\n",
    "with get_openai_callback() as cb:\n",
    "    llm(\"What is the square root of 4?\")\n",
    "    llm(\"What is the square root of 4?\")\n",
    "\n",
    "assert cb.total_tokens == total_tokens * 2\n",
    "\n",
    "# You can kick off concurrent runs from within the context manager\n",
    "with get_openai_callback() as cb:\n",
    "    await asyncio.gather(\n",
    "        *[llm.agenerate([\"What is the square root of 4?\"]) for _ in range(3)]\n",
    "    )\n",
    "\n",
    "assert cb.total_tokens == total_tokens * 3\n",
    "\n",
    "# The context manager is concurrency safe\n",
    "task = asyncio.create_task(llm.agenerate([\"What is the square root of 4?\"]))\n",
    "with get_openai_callback() as cb:\n",
    "    await llm.agenerate([\"What is the square root of 4?\"])\n",
    "\n",
    "await task\n",
    "assert cb.total_tokens == total_tokens"
   ]
  },
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