[BUG] API Error 400 : opusplan, planning works, generating code results in this error

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?

I'm trying something trivial, appending a lorem ipsum string to an array in typescript.

Opusplan is the model I use in .claude/settings.json

Planning goes well, generating results in API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"Output blocked by content filtering policy"},"request_id":"req_011CYsWKdhGgeAg2a7cuHREK"}

Is persistent since yesterday.

What Should Happen?

Add the string to the array.

Error Messages/Logs

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"Output blocked by content filtering policy"},"request_id":"req_011CYsWKdhGgeAg2a7cuHREK"}

Steps to Reproduce

This is the prompt: In the interactive elements in de tutorial, add an element of 1200 lorem ipsum words, preceded that you can test this text in scroll mode by hitting two times tab from operator general

Claude Model

Other

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude Code v2.1.71

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Other

Additional Information

_No response_