在 AI 应用开发中，若需动态切换大模型、调整温度等参数，可通过 init_chat_model 函数的 configurable_fields 核心配置字段实现。它支持在运行时动态修改模型参数，可基于配置规则精准控制参数的开放修改边界，配置生效后函数将返回 _ConfigurableModel 可配置模型实例，支撑全链路调用环节的参数动态调整。
如果喜欢看视频学习的，可以看这个《10. LangChain开发核心技巧，动态切换AI大模型参数》，喜欢看文章的接着往下看。
configurable_fields 的默认值为 None，对应关闭所有动态配置；传入字面量 'any' 时开放全量参数的动态修改权限；传入 list[str] / tuple[str, ...] 字符串序列时，仅开放显式声明的参数的修改权限。
init_chat_model(model: str | None = None,*,model_provider: str | None = None,configurable_fields: Literal['any'] | list[str] | tuple[str, ...] | None = None,config_prefix: str | None = None,**kwargs: Any = {}
) -> BaseChatModel | _ConfigurableModel
在 AI 大模型的参数配置体系中，90% 的常规业务场景，仅需配置model、temperature和max_tokens三个核心参数，即可完成模型的基础调用配置。
完成参数配置后，可直接通过invoke()方法调用 AI 大模型，接收并获取模型生成的回复结果。
若需灵活调整参数，我们可通过with_config()方法，在完整保留原有基础配置的前提下，快速修改目标参数并生成全新的模型实例；该实例无需额外冗余配置，同样可直接通过invoke()方法完成调用。
import os
from dotenv import load_dotenv
from langchain.chat_models import init_chat_model
# @老陈说编程 今日头条 哔哩哔哩
load_dotenv()
config_llm = init_chat_model(model="qwen3.6-plus",model_provider="openai",base_url=os.getenv("QWEN_BASE_URL"),api_key=os.getenv("QWEN_API_KEY"),configurable_fields=["model", "temperature", "max_tokens"],temperature=0.5,max_tokens=200)
response = config_llm.invoke("你好，请用一句话介绍自己")
print(response.content)
print("-" * 50)
# 切换大模型
llm_plus = config_llm.with_config(configurable={"model": "deepseek-v4-pro", "temperature": 0.4, " max_tokens": 100}
)
response = llm_plus.invoke("你好，请用一句话介绍自己")
print(response.content)
以下为.env 环境配置文件的内容，记得必将其中的 API_KEY 占位值，替换为您自行在对应平台申请的有效API密钥。
QWEN_API_KEY="你申请的API KEY" QWEN_BASE_URL="https://dashscope.aliyuncs.com/compatible-mode/v1"
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