Plan Mode is still needed

What feature would you like to see?

Although there is already a create-plan skill, I find it to be unstable. Sometimes when I want to continue the conversation with the AI to optimize the plan, it responds to the dialogue but then immediately starts writing code, which is not what I want. I still want to make further modifications to the plan.

Additionally, the AI should also output pseudocode, because it provides more predictability than a textual descripition.

We also need a feature similar to "Opus Plan Mode" in Claude Code, where advanced models or high reasoning model handle the planning, and intermediate models / moderate reasoning model handle the coding. Maybe GPT-5.2-high for planning, GPT-5.2-Codex for coding?

Additional information

_No response_