[BUG] API Error: Stream idle timeout - partial response received" on Claude Code Web

[LDelorenzo41]

Preflight Checklist

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

What's Wrong?

Claude Code Web frequently stops mid-response and shows this error:

API Error: Stream idle timeout - partial response received

The response often starts normally, then stops before completion, and only a partial answer is displayed.

What Should Happen?

Claude Code Web should complete the response normally without stopping mid-stream or showing a timeout error.

Error Messages/Logs

API Error: Stream idle timeout - partial response received

Steps to Reproduce

1. Open Claude Code Web in the browser.
2. Start a normal conversation.
3. Send a prompt that requires a long or multi-step response.
4. Wait while the answer is streaming.
5. In some cases, the response stops before completion and the UI shows:
   "API Error: Stream idle timeout - partial response received"

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

N/A (Claude Code Web)

Claude Code Version

Web version (no local CLI version)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

This issue occurs on Claude Code Web in browser usage, not in local CLI.

Browser: Chrome / ChatGPT Browser-based environment on macOS
Connection: stable
Frequency: multiple times per day

It seems more common during longer or more complex responses.

[silent-j-12345]

I've also been getting this on the web interface near constantly for the last 2 days, across Sonnet, Opus and Opus(1M)

[fredyfx]

Try with "continue" or "resume", this is working for me.
The other "little detail" that seems that works too is to change to Sonnet 4.6.

[dhruv-anand-aintech]

That's not a fix. And it doesn't work after several continues. And I've been on sonnet4.6 from the start

[mdscaff]

This is still an issue and has been for me since yesterday, independent of model chosen. It's happening no matter which model I try to use.