[BUG] Can’t load any images

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.0.content.4.image.source.base64.data: Image does not match the provided media type image/webp"},"request_id":"req_011CXATEKhfzTDhCEVXm6PbN"} I am using the Web version and not the terminal. It won’t let me upload any pictures, they are PNG and it was perfectly fine before.

What Should Happen?

I should be able to load jpg and png images.

Error Messages/Logs

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.0.content.4.image.source.base64.data: Image does not match the provided media type image/webp"},"request_id":"req_011CXATEKhfzTDhCEVXm6PbN"}

Steps to Reproduce

Upload a picture on the web version

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Web

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_