InvalidRequestError
anthropic.InvalidRequestError
Stack trace
anthropic.InvalidRequestError: Model not found: invalid model name 'claude-v1x' provided
at anthropic.client._request (/path/to/anthropic/client.py:123)
at main (/app/main.py:45) Why it happens
This error occurs when the model name passed to the Anthropic client does not match any available Claude model names. It can happen due to typos, deprecated model names, or using a model name not yet released or supported by the SDK version.
Detection
Validate the model name string before making the API call, and catch InvalidRequestError exceptions to log the invalid model name and prevent crashes.
Causes & fixes
Typo or incorrect model name string passed to the Anthropic client
Verify and correct the model name string to an exact valid Claude model name such as 'claude-3-5-sonnet-20241022' or 'claude-3-5-haiku-20241022'.
Using a deprecated or retired Claude model name no longer supported by the API
Update your code to use a currently supported Claude model name from the latest Anthropic documentation.
Mismatch between Anthropic SDK version and available models
Upgrade the Anthropic SDK to the latest version to ensure support for the newest Claude models.
Code: broken vs fixed
import os
from anthropic import Anthropic
client = Anthropic(api_key=os.environ['ANTHROPIC_API_KEY'])
response = client.messages.create(
model='claude-v1x', # invalid model name triggers error
prompt='Hello, world!',
max_tokens=50
)
print(response.content)import os
from anthropic import Anthropic
client = Anthropic(api_key=os.environ['ANTHROPIC_API_KEY'])
response = client.messages.create(
model='claude-3-5-sonnet-20241022', # fixed valid model name
prompt='Hello, world!',
max_tokens=50
)
print(response.content) # prints the completion textWorkaround
Catch InvalidRequestError exceptions and fallback to a default valid Claude model name hardcoded in your code to maintain functionality temporarily.
Prevention
Always verify model names against the official Anthropic documentation and keep your SDK updated to avoid using unsupported or invalid model names.