ChatGPT desktop crashes when opening a long local Codex thread

Summary

The ChatGPT desktop app on macOS quits immediately when opening one specific long local Codex thread from the sidebar.

Steps to reproduce

1. Launch the ChatGPT desktop app.
2. Open an existing local Codex thread containing a long history with many tool/reasoning events and multiple spreadsheet preview images.
3. The entire desktop app quits immediately.

Expected behavior

The selected thread opens normally.

Actual behavior

The ChatGPT desktop process crashes. Other threads open normally, and the affected thread still exists with an idle status.

Reproducibility

The crash occurs every time the affected thread is clicked.

Environment

• ChatGPT app: 26.831.21537 (build 7579)
• Bundled Codex Desktop: 0.152.1
• macOS: 15.3 (24D2059), arm64
• Crash time: 2026-09-10 01:21:22 +0800

Crash details

The macOS crash report shows EXC_BREAKPOINT / SIGTRAP on the main CrBrowserMain thread, with Chromium/V8 frames. This suggests the crash occurs while loading, rendering, or serializing the large thread.

Additional notes

• A newly created lightweight replacement thread opens normally.
• The affected thread contains many historical tool events and rendered spreadsheet previews.
• No private thread transcript or spreadsheet data is attached. A sanitized crash report can be provided if requested.

Start by reproducing the crash with the affected long local Codex thread and inspect the sanitized macOS crash report, especially the CrBrowserMain Chromium/V8 frames. Trace whether loading, rendering, or serializing the thread triggers the failure; done means the affected thread opens normally without crashing while lightweight and other threads continue to work.