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How to get text from Claude API response in python

Q: How to get text from Claude API response in python

Use the official anthropic Python SDK to call the Claude model and access the response text via message.content[0].text. Initialize the client with your API key from os.environ, then call client.messages.create() with your prompt and model name.

Quick answer

Use the official anthropic Python SDK to call the Claude model and access the response text via message.content[0].text. Initialize the client with your API key from os.environ, then call client.messages.create() with your prompt and model name.

PREREQUISITES

Python 3.8+
Anthropic API key
pip install anthropic>=0.20

Setup

Install the official Anthropic Python SDK and set your API key as an environment variable.

Run pip install anthropic>=0.20 to install the SDK.
Set your API key in your shell: export ANTHROPIC_API_KEY='your_api_key_here'.

bash

pip install anthropic>=0.20

Step by step

Use this complete Python example to send a prompt to Claude and extract the text from the response.

python

import os
import anthropic

client = anthropic.Anthropic(api_key=os.environ["ANTHROPIC_API_KEY"])

message = client.messages.create(
    model="claude-3-5-haiku-20241022",
    max_tokens=500,
    system="You are a helpful assistant.",
    messages=[{"role": "user", "content": "Hello, how are you?"}]
)

text = message.content[0].text
print(text)

output

Hello! I'm doing well, thank you. How can I assist you today?

Common variations

You can change the model parameter to other Claude versions like claude-3-5-haiku-20240229. For asynchronous calls, use Python's asyncio with the SDK's async client methods. Streaming responses are not currently supported in the official SDK.

python

import asyncio
import os
import anthropic

async def main():
    client = anthropic.Anthropic(api_key=os.environ["ANTHROPIC_API_KEY"])
    message = await client.messages.acreate(
        model="claude-3-5-haiku-20240229",
        max_tokens=300,
        system="You are a helpful assistant.",
        messages=[{"role": "user", "content": "Tell me a joke."}]
    )
    print(message.content[0].text)

asyncio.run(main())

output

Why did the scarecrow win an award? Because he was outstanding in his field!

Troubleshooting

If you get an authentication error, verify your ANTHROPIC_API_KEY environment variable is set correctly. If the response is empty, check your max_tokens parameter and ensure your prompt is valid. For network issues, confirm your internet connection and retry.

✅

Key Takeaways

Use message.content[0].text to extract the text from the Claude API response.
Always initialize the Anthropic client with your API key from os.environ.
The system parameter sets the assistant's behavior, while messages contains user input.
You can use async methods with the Anthropic SDK for non-blocking calls.
Check environment variables and token limits if you encounter errors or empty responses.

Verified 2026-04 · claude-3-5-haiku-20241022, claude-3-5-haiku-20240229

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