[BUG] False "check your network" timeout error during long Opus 4.8 processing in /advisor mode

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 /advisor mode with Opus 4.8 (while my primary mode is set to Sonnet 5), the CLI incorrectly throws a network retry error (Waiting for API response · will retry in 0s · check your network). This is not an actual network issue, but rather a synchronization problem caused by Opus's naturally longer processing time. The client timeout threshold appears to be too short for Opus's expected API response latency, leading to a false positive network warning.

What Should Happen?

The CLI should display a standard loading or processing indicator that accommodates the longer inference time of the Opus 4.8 model without prematurely triggering a network error.

Error Messages/Logs

The CLI displays an error state indicating a network failure: ✻ Waiting for API response · will retry in 0s · check your network.

Steps to Reproduce

1. Launch Claude Code with Sonnet 5 as the primary model.
2. Enter /advisor mode, utilizing Opus 4.8 as the advisor.
3. Submit a prompt that requires Opus 4.8 to process a complex task.
4. Observe the terminal output while waiting for the API response.

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.198 (Claude Code)

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

VS Code integrated terminal

Additional Information

<img width="618" height="268" alt="Image" src="https://github.com/user-attachments/assets/d092e1b4-393e-43f5-96ad-acb99b9babf1" />