What is the purpose of the 'anthropic-version' header required in Claude API requests?
Select an answer to reveal the explanation.
Short Explanation
The anthropic-version header tells the API which version of the API spec your client speaks. It's like a handshake so the server and client agree on the message format.
Full Explanation
The 'anthropic-version' header, such as '2023-06-01', declares the API version the client is targeting. This lets Anthropic make backwards-incompatible changes in newer API versions while still supporting older clients. If a client sends an older version value, Anthropic's servers respond with the corresponding API behavior for that version. This is different from the model version, which is specified in the 'model' request parameter. The option saying it specifies which version of the Claude model to use confuses API version with model version. The option saying it indicates the version of the Anthropic Python SDK installed describes SDK versioning, not an API header. The option saying it specifies the maximum number of API version upgrades allowed per month is nonsensical.