Selected GPT-5.6 Sol invoked another high-cost model without user approval

[XenFunD]

🏷️ Discussion Type

Bug

💬 Feature/Topic Area

Copilot Agent Mode

Body

I was using Copilot Agent in PhpStorm and explicitly selected GPT-5.6 Sol for the operation. However, Copilot later stated that it launched a separate Claude Opus 5 maximum-reasoning agent for review.

I did not request or authorize this additional model execution, yet the operation reportedly consumed 4,500+ credits by invoking the higher-cost Claude Opus 5 model without my consent. This resulted in significantly higher credit usage than I expected based on my explicit selection of GPT-5.6 Sol.

This raises serious concerns about user consent, model-selection transparency, and unexpected credit consumption.

Expected behavior: When a user explicitly selects a model in PhpStorm, Copilot should either use that model or clearly ask for permission before invoking another, especially a higher-cost model.

Please clarify whether this is intended behavior and provide a “selected model only” option, approval prompt, or clear cost warning before additional models are invoked.

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