[Bug] Cannot send second chat message because model selection is unavailable after first chat

[bbinh1607]

Codex Web GPT version

v5.0.6

Codex version

codex-cli

Platform

Windows x64

OS version

Windows 11

ChatGPT account tier

Plus

Integration mode

Full harness (MCP)

Selected model

chatgpt-web/medium medium

What happened?

I can send the first chat message successfully.

However, when I try to send the second message, the model cannot be selected and the request fails.

Result:
✅ First message works normally

Second message:
❌ Model selection does not work
❌ Cannot continue chatting

Screenshot attached.

Minimal reproduction

Complete final error

NA

Privacy-safe diagnostics

NA

Other Codex wrappers or route owners

NA

Preflight checklist

• I tested the latest release and, for catalog or turn failures, fully restarted Codex including its background process.
• I stated whether the failure also occurs in a fresh Codex task, or explained why that does not apply.
• I attached only a privacy-safe export, or explained why the exporter could not produce one; I removed any remaining private content.
• I searched existing issues for this exact final error.

[miuuyy]

Please capture one successful first message followed by the failing second message. Include the launcher and Codex versions, selected model/effort, and whether Bigger Context is enabled. What exact model-selection error appears? A screenshot of the model controls in the launcher-owned ChatGPT tab at that moment would help alongside the log; please hide private conversation contents.

Please attach Launcher → Activity → Export safe log immediately after one reproduction. Drag the exported file into a reply here, or ZIP it if GitHub rejects the extension. Include the failure time/timezone. Do not post raw logs, credentials, full configuration, or private conversation/tool contents.