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{"detail":"The '' model is not supported when using Codex with a ChatGPT account."} #8179

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{"detail":"The '' model is not supported when using Codex with a ChatGPT account."}#8179
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bugSomething isn't workingextensionIssues related to the VS Code extensionwindows-osIssues related to Codex on Windows systems

Description

@nos1609
nos1609
opened on Dec 17, 2025

What version of the VS Code extension are you using?

v0.4.51

What subscription do you have?

Plus

Which IDE are you using?

VS Code

What platform is your computer?

Windows 11 25h2 ARM64

What issue are you seeing?

Just the second answer in a new chat gives me "{"detail":"The '' model is not supported when using Codex with a ChatGPT account."}".

Image

What steps can reproduce the bug?

Start a new conversation in agent (full access) mode, once You get the first reply, try a new prompt, suggesting Agentic actions.

What is the expected behavior?

Some text-based answer.

Additional information

Thread ID 019b2c41-c771-7631-abf4-a90ac049bec6

Activity

  1. nos1609
    added
    extensionIssues related to the VS Code extension
    on Dec 17, 2025
  2. github-actions
    added
    bugSomething isn't working
    windows-osIssues related to Codex on Windows systems
    on Dec 17, 2025

  3. github-actions commented on Dec 17, 2025

    @github-actions
    github-actionsbot
    on Dec 17, 2025 – with GitHub Actions
    Contributor

    Potential duplicates detected. Please review them and close your issue if it is a duplicate.

    Powered by Codex Action

  4. nos1609 commented on Dec 17, 2025

    @nos1609
    nos1609
    on Dec 17, 2025
    Author

    Looks like really some VS Code extension related issue, as the model is selected and not selected at the same time

    Image Image

  5. nos1609 commented on Dec 17, 2025

    @nos1609
    nos1609
    on Dec 17, 2025
    Author

    Manual model selection in drop down menu resumes the chat for me. But still an issue in the extension.

  6. nos1609 commented on Dec 17, 2025

    @nos1609
    nos1609
    on Dec 17, 2025
    Author

    Some additional info:
    There was a chat transition from codex extension to a tabbed version via VS Code's Recent Sessions drop-down menu, looks like something is getting lost if multiple GUI instances of Codex are being opened simultaneously in a single VS Code window.

  7. shijie-oai commented on Dec 17, 2025

    @shijie-oai
    shijie-oai
    on Dec 17, 2025
    Contributor

    Thanks for filing! Can you also check in your ~/.codex/config.toml file and see if there is a model entry (i.e. model = "gpt-5.1-codex").

  8. shijie-oai commented on Dec 18, 2025

    @shijie-oai
    shijie-oai
    on Dec 18, 2025
    Contributor

    Some additional info: There was a chat transition from codex extension to a tabbed version via VS Code's Recent Sessions drop-down menu

    Can you also elaborate more on this? I am having a hard time find this in vscode. Or did you mean opening a different task from the recent tasks dropdown in the extension.

  9. gpeal
    closed this as completedon Mar 10, 2026

  10. bijalsanghavi commented on May 10, 2026

    @bijalsanghavi
    bijalsanghavi
    on May 10, 2026

    For me updating the codex cli allowed me to change the model to 4.0 models and then it worked with the older models.

  11. diOnysosdk commented on Jun 6, 2026

    @diOnysosdk
    diOnysosdk
    on Jun 6, 2026

    open the settings in codex, open configuration and open the config.toml and change model to 5.4 and restart vs code.

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