github / github/copilot-cli

Add support for GPT-5.6 reasoning.mode parameter

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area:models
Dominant language
Shell
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Description

Describe the feature or problem you'd like to solve

GPT-5.6 introduced a reasoning.mode parameter which can have the value of "standard" or "pro". It defaults to "standard". Add a way to select the "pro" reasoning mode.

Proposed solution

No response

Example prompts or workflows

No response

Additional context

No response

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 tracing how the CLI currently handles reasoning parameters, then compare that behavior with the linked OpenAI reasoning-mode documentation. The work is done when users can select "pro" and the existing "standard" default remains unchanged.

Written by the indexing model from the issue text.

Assessment

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

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