Codex mobile remote renders one assistant final reply twice while local transcript has one final_answer

What version of Codex CLI is running?

Host Codex App: OpenAI.Codex_26.602.4764.0_x64__2p2nqsd0c76g0
CLI on PATH: codex-cli 0.113.0

What subscription do you have?

Plus

Which model were you using?

GPT-5.5

What platform is your computer?

Host: Windows 11 Pro 10.0.26200, x64.
Remote client: ChatGPT mobile app using Codex mobile/remote access. Exact mobile app version not available at report time.

What issue are you seeing?

A single assistant final reply appeared twice in the mobile Codex/ChatGPT remote view.

Important detail: the Windows host/local session transcript does not appear to contain the final reply twice. The local transcript for the affected turn shows:

• one commentary agent message with different short progress text
• one final_answer agent message with the actual answer
• no second identical final_answer in the local JSONL transcript

So this looks like a mobile remote rendering/sync duplication, not duplicate user input and not the known CLI/TUI case where identical content is emitted as both commentary and final_answer.

Possibly related but not the same root cause: #15633.

What steps can reproduce the bug?

Not deterministic yet. Observed once in an active Codex App thread controlled from the ChatGPT mobile app:

1. Use ChatGPT mobile app to continue/control a Codex App thread on a Windows host.
2. Ask a normal follow-up question.
3. Codex sends a short progress/commentary message, uses local tools, then sends one final answer.
4. On mobile, the final answer is rendered twice.
5. On the host/local transcript, the final answer is present only once.

Affected local thread/session id: 019e94e6-ed3a-73b1-a314-1b702804301b.
Observed around: 2026-06-05 22:02 UTC / 2026-06-06 00:02 Europe/Berlin.

What is the expected behavior?

The mobile remote view should render exactly one visible copy of a final assistant reply when the local/session transcript contains only one final answer for that turn.

Additional information

I do not have a mobile screenshot attached yet. The report is based on the user's mobile observation plus a local transcript check on the Windows host immediately afterward.