Claude's Messages API takes four times more per request: 32 MB becomes 128 MB on the first-party API
Synopsis
Anthropic's Claude Platform release notes raise the maximum request size for the Messages API and the Token Counting API from 32 MB to 128 MB on the first-party Claude API. Before this change, both endpoints stopped at 32 MB, so larger inputs could not be submitted as a single request. The change covers request size on the first-party Claude API only, and the notes report no throughput, latency or cost measurements.
Interpretation
A single request to the first-party Claude API can now carry more content, with the Messages API and Token Counting API accepting up to 128 MB. The previous maximum request size for these two endpoints was 32 MB, so larger inputs had to be split or compressed before sending. The release notes record the change under October 28 and state that the new 128 MB limit applies to the first-party Claude API.
With the higher ceiling, one request can hold more files, images or long text, and callers need not split requests to fit the size limit. The Messages API handles conversation requests and the Token Counting API counts tokens before sending, and both previously shared the 32 MB size constraint. The release notes list both endpoints in the same entry and do not say whether they use different values.
Perspective
The change applies to the Messages API and Token Counting API on the first-party Claude API, and the release notes do not say whether other access paths were adjusted at the same time.
The release notes give only the size-limit change and do not describe how larger requests behave in latency, billing or error rates.