anthropic
#10492
message_content_error
All messages must have non-empty content except for the optional final assistant message.
This error has been identified and solved.
Reason
The 400 Bad Request error with the message "all messages must have non-empty content except for the optional final assistant message" in the Anthropic API is occurring because one or more of the messages in your request payload have empty content. Here are the key points:
The API requires that all messages, except for the optional final assistant message, must contain non-empty content[3|.
Empty messages, even if they are part of the conversation history, are not accepted by the API.
This error indicates that the structure of your request does not meet the API's requirements for message content, leading to an
invalid_request_error.
Solution
To fix the 400 Bad Request error with the message "all messages must have non-empty content except for the optional final assistant message" in the Anthropic API, you need to ensure that your request payload complies with the API's requirements. Here are the steps to resolve this issue:
Ensure Message Content
Filter out any messages with empty content before sending the request.
Verify that all messages, except for the optional final assistant message, have non-empty content.
Payload Structure
Make sure the messages alternate between user and assistant roles correctly.
The first and last messages should be from the user, unless the last message is an optional empty assistant message.
Final Check
Review your payload to ensure no messages have been inadvertently left empty during processing or initialization.
Suggested Links
https://www.restack.io/p/anthropic-answer-http-400-bad-request-cat-ai
https://www.codalas.com/en/2407/how-to-build-a-compliant-payload-for-anthropic-api
https://github.com/langgenius/dify/issues/10013
https://forum.cursor.com/t/unable-to-reach-anthropic/22766
https://docs.anthropic.com/en/api/getting-started
https://docs.anthropic.com/en/api/errors
