[BUG] API Error 400

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?

When using a Claude chat I got this error: API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"Could not process image"} and it keeps happening when I use the same chat. Other chats, etc. worked. I had to compact my chat in order to keep using it, the chat became completely unusable

I saw other people had this issue, but mostly in 2025, and the issues were all closed. @ah-anthropic @km-anthropic @np-anthropic it looks like many issues get set to inactive or untagged and then you guys don't see them, so I'm tagging Anthropic staff to make sure this is seen.

<img width="1007" height="862" alt="Image" src="https://github.com/user-attachments/assets/ca2ecdfd-add2-4af4-9418-9530f6c0f176" />

What Should Happen?

Claude should just continue regularly without the error.

Error Messages/Logs

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"Could not process image"},"request_id":"req_011CaCxJUMz1esa8vxMFCQT3"}

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"Could not process image"},"request_id":"req_011CaCxubV5Z3RF8u3TASVus"}

Steps to Reproduce

I asked Claude to download an image from Steam and fetch some images from the web.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude 1.3109.0 (35cbf6) 2026-04-16T20:32:01.000Z

Platform

Other

Operating System

Windows

Terminal/Shell

Other

Additional Information

Using the Claude Desktop App latest version.