ChatAnthropic

This notebook covers how to get started with Anthropic chat models.

from langchain_community.chat_models import ChatAnthropic
from langchain_core.prompts import ChatPromptTemplate

chat = ChatAnthropic(temperature=0, model_name="claude-2")

The code provided assumes that your ANTHROPIC_API_KEY is set in your environment variables. If you would like to manually specify your API key and also choose a different model, you can use the following code:

chat = ChatAnthropic(temperature=0, anthropic_api_key="YOUR_API_KEY", model_name="claude-instant-1.2")

Please note that the default model is “claude-2,” and you can check the available models at here.

system = "You are a helpful assistant that translates {input_language} to {output_language}."
human = "{text}"
prompt = ChatPromptTemplate.from_messages([("system", system), ("human", human)])

chain = prompt | chat
chain.invoke({
    "input_language": "English",
    "output_language": "Korean",
    "text": "I love Python",
})

AIMessage(content=' 저는 파이썬을 좋아합니다.')

`ChatAnthropic` also supports async and streaming functionality:

chat = ChatAnthropic(temperature=0, model_name="claude-2")
prompt = ChatPromptTemplate.from_messages([("human", "Tell me a joke about {topic}")])
chain = prompt | chat
await chain.ainvoke({"topic": "bear"})

AIMessage(content=" Why don't bears like fast food? Because they can't catch it!")

chat = ChatAnthropic(temperature=0.3, model_name="claude-2")
prompt = ChatPromptTemplate.from_messages(
    [("human", "Give me a list of famous tourist attractions in Japan")]
)
chain = prompt | chat
for chunk in chain.stream({}):
    print(chunk.content, end="", flush=True)

 Here are some of the most famous tourist attractions in Japan:

- Tokyo - Tokyo Tower, Tokyo Skytree, Imperial Palace, Sensoji Temple, Meiji Shrine, Shibuya Crossing

- Kyoto - Kinkakuji (Golden Pavilion), Fushimi Inari Shrine, Kiyomizu-dera Temple, Arashiyama Bamboo Grove, Gion Geisha District

- Osaka - Osaka Castle, Dotonbori, Universal Studios Japan, Osaka Aquarium Kaiyukan 

- Hiroshima - Hiroshima Peace Memorial Park and Museum, Itsukushima Shrine (Miyajima Island)

- Mount Fuji - Iconic and famous mountain, popular for hiking and viewing from places like Hakone and Kawaguchiko Lake

- Himeji - Himeji Castle, one of Japan's most impressive feudal castles

- Nara - Todaiji Temple, Nara Park with its bowing deer, Horyuji Temple with some of world's oldest wooden structures  

- Nikko - Elaborate shrines and temples nestled around Nikko National Park

- Sapporo - Snow

ChatAnthropicMessages

LangChain also offers the beta Anthropic Messages endpoint through the new langchain-anthropic package.

%pip install --upgrade --quiet  langchain-anthropic

from langchain_anthropic import ChatAnthropicMessages

chat = ChatAnthropicMessages(model_name="claude-instant-1.2")
system = (
    "You are a helpful assistant that translates {input_language} to {output_language}."
)
human = "{text}"
prompt = ChatPromptTemplate.from_messages([("system", system), ("human", human)])

chain = prompt | chat
chain.invoke(
    {
        "input_language": "English",
        "output_language": "Korean",
        "text": "I love Python",
    }
)

AIMessage(content='파이썬을 사랑합니다.')

ChatAnthropicMessages also requires the anthropic_api_key argument, or the ANTHROPIC_API_KEY environment variable must be set.

ChatAnthropicMessages also supports async and streaming functionality:

await chain.ainvoke(
    {
        "input_language": "English",
        "output_language": "Korean",
        "text": "I love Python",
    }
)

AIMessage(content='파이썬을 사랑합니다.')

prompt = ChatPromptTemplate.from_messages(
    [("human", "Give me a list of famous tourist attractions in Japan")]
)
chain = prompt | chat
for chunk in chain.stream({}):
    print(chunk.content, end="", flush=True)

Here are some of the most famous tourist attractions in Japan:

- Tokyo Tower - A communication and observation tower in Tokyo modeled after the Eiffel Tower. It offers stunning views of the city.

- Mount Fuji - Japan's highest and most famous mountain. It's a iconic symbol of Japan and a UNESCO World Heritage Site. 

- Itsukushima Shrine (Miyajima) - A shrine located on an island in Hiroshima prefecture, known for its "floating" torii gate that seems to float on water during high tide.

- Himeji Castle - A UNESCO World Heritage Site famous for having withstood numerous battles without destruction to its intricate white walls and sloping, triangular roofs. 

- Kawaguchiko Station - Near Mount Fuji, this area is known for its scenic Fuji Five Lakes region. 

- Hiroshima Peace Memorial Park and Museum - Commemorates the world's first atomic bombing in Hiroshima on August 6, 1945. 

- Arashiyama Bamboo Grove - A renowned bamboo forest located in Kyoto that draws many visitors.

- Kegon Falls - One of Japan's largest waterfalls

ChatAnthropic also supports async and streaming functionality:​

ChatAnthropicMessages

`ChatAnthropic` also supports async and streaming functionality: