AuthenticationError
anthropic.client.AuthenticationError
Stack trace
anthropic.client.AuthenticationError: Invalid API key provided. Please check your API key and try again.
File "app.py", line 12, in <module>
response = client.messages.create(model="claude-3-5-sonnet-20241022", messages=[{"role": "user", "content": "Hello"}])
File "/usr/local/lib/python3.9/site-packages/anthropic/client.py", line 234, in create
raise AuthenticationError("Invalid API key provided.") Why it happens
This error occurs because the Anthropic client cannot authenticate your request due to an invalid, missing, or revoked API key. The client checks the key before sending requests, and if it fails validation, it raises AuthenticationError immediately.
Detection
Catch AuthenticationError exceptions when calling Anthropic client methods and log the API key environment variable presence and correctness before retrying or failing.
Causes & fixes
API key environment variable 'ANTHROPIC_API_KEY' is not set or empty
Set the 'ANTHROPIC_API_KEY' environment variable with your valid Anthropic API key before running your application.
API key string is malformed or contains extra whitespace
Ensure the API key string is copied exactly from your Anthropic dashboard without extra spaces or line breaks.
Using an expired or revoked API key
Generate a new API key from the Anthropic dashboard and update your environment variable accordingly.
Passing the API key incorrectly in the client initialization or missing it entirely
Use the Anthropic client constructor correctly by relying on the environment variable or explicitly passing the API key parameter.
Code: broken vs fixed
from anthropic import Anthropic
client = Anthropic() # Missing API key environment variable
response = client.messages.create(model="claude-3-5-sonnet-20241022", messages=[{"role": "user", "content": "Hello"}]) # Raises AuthenticationErrorimport os
from anthropic import Anthropic
os.environ["ANTHROPIC_API_KEY"] = "your_valid_api_key_here" # Set your API key securely
client = Anthropic()
response = client.messages.create(model="claude-3-5-sonnet-20241022", messages=[{"role": "user", "content": "Hello"}])
print(response)Workaround
Wrap Anthropic client calls in try/except AuthenticationError, and prompt the user or system to reload or reset the API key environment variable dynamically.
Prevention
Use secure environment management to ensure the API key is always set correctly before starting your application, and monitor key validity via Anthropic dashboard alerts.