[BUG]

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?

Claude code receives a content filtering error when directed to generate a large enough sample of Lorem Ipsum.

What Should Happen?

Given that Lorem Ipsum is not a legally protected work, and it is frequently used as placeholder text for demonstration/development purposes, it seems like this is a case worth addressing during content filtering.

Error Messages/Logs

API Error: Output blocked by content filtering policy

Steps to Reproduce

Prompt claude with things like:

• "print a ten thousand character lorem ipsum"
• "write a ten thousand character lorem ipsum to LI.txt"

Observe the content filtering error occur after about 4 paragraphs of output.

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.231 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

Running in terminal app cmux 0.64.22 build 102

In talking with Claude about the issue, it reports:

the filter terminates the output stream, but the model gets no signal it happened, so it can't retry, fall back, or tell you it failed. The user sees API Error: Output blocked by content filter; the assistant sees a turn that apparently just ended. Same for tool-call content — the block landed before the Write ever reached the tool layer, so there's no partial file or failed-tool trace to point at either.