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[Bug] it currently defaults to use "fast" mode in gpt 5.5 subagent . #30427

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[Bug] it currently defaults to use "fast" mode in gpt 5.5 subagent .#30427
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CLIIssues related to the Codex CLIbugSomething isn't workingsubagentIssues involving subagents or multi-agent features

Description

@dazuiba
dazuiba
opened on Jun 28, 2026

What version of Codex CLI is running?

0.142.3

What subscription do you have?

When using subagent to call the GPT 5.5 model within a GPT 5.4 session, it currently defaults to use "fast" mode in gpt 5.5 subagent .

Which model were you using?

GPT 5.4

What platform is your computer?

macos

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

No response

Codex doctor report



What issue are you seeing?


    

  1. in main session, GPT5.4
    2. 

  2. use prompt to handoff task to agent GPT5.5
    3. 

  3. it currently defaults to use "fast" mode in gpt 5.5 subagent .  expect:  not use fast mode
    4. 


Image
Image

What steps can reproduce the bug?


Uploaded thread: 019f0d6a-decd-7170-b4ce-218d0a5b0c8b


What is the expected behavior?


No response


Additional information


No response
Activity
  1. dazuiba
    added 
    bugSomething isn't working
     on Jun 28, 2026
  2. github-actions
    added 
    CLIIssues related to the Codex CLI
     
    subagentIssues involving subagents or multi-agent features
     on Jun 28, 2026
  3. github-actions commented on Jun 28, 2026 
    @github-actions
    github-actionsBot
    on Jun 28, 2026 – with GitHub Actions
    Contributor
    Potential duplicates detected. Please review them and close your issue if it is a duplicate.
    


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