macOS desktop app cannot resume historical threads: initialTurnsPage rejected for paginated threads

Summary

All historical Codex desktop tasks fail to open. New tasks can be created, but existing tasks cannot be resumed.

Environment

• macOS
• ChatGPT/Codex desktop app version: 26.715.72359
• Bundled Codex CLI: 0.145.0-alpha.30

Steps to reproduce

1. Open the Codex desktop app.
2. Select any historical task.
3. The task fails immediately instead of opening.

Actual result

The app shows:

paginated threads do not support initialTurnsPage; use turnsBackwardsCursor and itemsBackwardsCursor

Identifiers

• Session ID: no-active-thread-01a0a4a6-b341-71d3-a764-30f4a0464b0b
• Failing conversation ID: 019f8916-3cd6-70a0-ba67-3f80e771cfb7
• Failing conversation ID: 01a09155-c622-7f22-b430-128649ec1d13

Expected result
The selected historical task should open and resume normally.

Additional information
New Codex chats open normally; only historical task resume fails.
First observed: September 15, 2026 (Europe/Berlin).

Relevant log output:

Request failed ... error={"code":-32600,"message":"paginated threads do not support initialTurnsPage; use turnsBackwardsCursor and itemsBackwardsCursor"} method=thread/resume

Failed to resume conversation ... errorMessage="paginated threads do not support initialTurnsPage; use turnsBackwardsCursor and itemsBackwardsCursor"

Start by tracing the macOS desktop app's thread/resume request into the bundled Codex CLI, focusing on the initialTurnsPage rejection. Compare the paginated-thread handling with the turnsBackwardsCursor and itemsBackwardsCursor fields named in the error. Done means historical tasks open and resume normally while new chats continue to work.