macOS: Same ChatGPT account works on Windows but fails with X-OpenAI-Internal-Codex-Responses-Lite on Codex CLI

What version of Codex CLI is running?

Codex CLI 0.142.4

What subscription do you have?

macOS CLI incorrectly routes ChatGPT-authenticated requests to Responses-Lite while Windows works

Which model were you using?

gpt5.4 and gpt5.5

What platform is your computer?

Mac OS 26.5.1 (25F80)

What terminal emulator and version are you using (if applicable)?

Apple Terminal.app 2.15 (470.2)

Codex doctor report

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}

What issue are you seeing?

After updating to Codex CLI 0.142.4 on macOS, every prompt fails immediately with the following error:

This model is not supported when using X-OpenAI-Internal-Codex-Responses-Lite.

Example prompt:

Explain this codebase

The same error also occurs with simple prompts such as:

Hello

I have already verified the following:

• Updated to the latest Codex CLI (0.142.4)
• Logged out and logged back in
• Cleared the local authentication state
• Tested multiple models, including:
• gpt-5.5
• gpt-5.4
• gpt-5.4-mini
• The issue persists across all of them.

The most important observation is that the exact same ChatGPT account works correctly on Windows, but fails consistently on macOS with the Responses-Lite error.

This suggests the issue may be specific to the macOS client or its local state rather than the account itself.

What steps can reproduce the bug?

Steps to reproduce:

1. Use macOS with Apple Terminal.app.
2. Install or update Codex CLI to 0.142.4.
3. Log in with a ChatGPT account.
4. Start Codex:

codex

1. Send any prompt, for example:

Explain this codebase

or:

Hello

1. The request fails with:

This model is not supported when using X-OpenAI-Internal-Codex-Responses-Lite.

I also tested with multiple models:

gpt-5.5
gpt-5.4
gpt-5.4-mini

All of them fail with the same error on macOS.

No thread id is available.

What is the expected behavior?

After signing in with a valid ChatGPT account, Codex CLI should execute prompts normally.

The same ChatGPT account already works correctly on Windows. Therefore, I expect the macOS client to behave identically and execute requests successfully without routing them to an unsupported Responses-Lite path.

Simple prompts such as:

Hello

or

Explain this codebase

should return normal model responses instead of:

This model is not supported when using X-OpenAI-Internal-Codex-Responses-Lite.

Additional information

Additional observations:

• The same ChatGPT account works correctly on Windows using the same Codex version.
• The issue only occurs on macOS.
• I updated Codex CLI to the latest available version (0.142.4), but the problem persists.
• I tested multiple models (gpt-5.5, gpt-5.4, and gpt-5.4-mini). The same error occurs regardless of the selected model.
• I logged out, cleared the local authentication state, and logged in again. The behavior did not change.
• My config.toml is using the default ChatGPT authentication (openai_http, wire_api = "responses"), without a custom proxy or custom API endpoint.
• If additional debug logs, codex doctor --json output, or sanitized configuration files would help, I’m happy to provide them.
• This issue appears to be platform-specific rather than account-specific, since the exact same ChatGPT account works normally on Windows.