提供商和模型

from langchain.chat_models import init_chat_model

openai_model = init_chat_model("openai:gpt-5.5")
anthropic_model = init_chat_model("anthropic:claude-opus-4-8")
google_model = init_chat_model("google-genai:gemini-3.1-pro-preview")

for model in [openai_model, anthropic_model, google_model]:
    response = model.invoke("用一句话解释量子计算。")
    print(response.text)

uv add langchain-openai       # For OpenAI models
uv add langchain-anthropic    # For Anthropic models
uv add langchain-google-genai # For Google models

model = init_chat_model("google_genai:gemini-mythos")

from langchain.chat_models import init_chat_model

model = init_chat_model("openrouter:anthropic/claude-sonnet-4-6")
response = model.invoke("Hello!")

from langchain_openai import ChatOpenAI

model = ChatOpenAI(
    base_url="https://your-provider.com/v1",
    api_key="your-api-key",
    model="provider-model-name",
)