github / github/copilot-cli

general-purpose subagent uses gpt-5.4-mini even when configured to inherit model

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area:agents area:models
Dominant language
Shell
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Description

Describe the bug

general-purpose subagent uses gpt-5.4-mini even when configured to inherit model from session.

Affected version

1.0.75

Steps to reproduce the behavior
  1. Configure GPT-5.6 Sol as the session model.
  2. Configure general-purpose subagent to inherit model.
  3. Trigger a general-purpose subagent.
  4. Subagent uses gpt-5.4-mini.
Expected behavior

Subagent follows configuration, inheriting session model.

Additional context

Operating system: Linux
CPU architecture: x86_64
Terminal emulator: Gnome Terminal
Shell: zsh

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the issue with the listed session and general-purpose subagent configurations, then trace the general-purpose subagent's model-selection and inheritance handling in the CLI. Done means the subagent uses the configured session model when its configuration is set to inherit, with a regression test covering the reported behavior.

Written by the indexing model from the issue text.

Assessment

Tech stack
shell
Domain
ai, cli
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
55/100

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