[BUG] API error when screenshots are attached to existing or even new session on claude code

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?

at times when i attach screenshot to session it throws api errror, even when with new chat sessions, This has occurred many times in my coding journey with claude code.

What Should Happen?

when screenshot is attached no errors should be displayed

Error Messages/Logs

API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011Ca22HeiECk7wNBGKp7dW4"}

Steps to Reproduce

when a screenshot is attached it sends api error in response API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011Ca22HeiECk7wNBGKp7dW4"}

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Claude 1.2278.0 (e5213f) 2026-04-13T17:49:21.000Z

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

<img width="1256" height="318" alt="Image" src="https://github.com/user-attachments/assets/b2859c44-242c-41e7-9e21-b76d80fea7ec" />