Your Copilot Model Migration Needs a Rehearsal, Not a New Dropdown
A model selector can show a suggested replacement while your team's pinned workflow still names the old model. The picker changed; the workflow may not have. Rerun a real task before signing off. GitHub's Copilot changelog schedules selected model deprecations for October 19, 2026, across Copilot chat, inline edits, ask and agent modes, and completions. It lists suggested alternatives and calls…
When migrating Copilot models, it's crucial to conduct a rehearsal, not just change the dropdown selection. The model selector may suggest a replacement, but the workflow could still reference the old model. Before finalizing, run a real task to verify the new choice. Check your organization's policy for allowed alternatives. Don't assume the picker update affects every pinned choice.
Test one small task, like adding an error state to a form, with fixed context before changing models. Record key details such as the selected model, policy, required checks, and results. Compare outputs against acceptance conditions to ensure the new model works as expected. If the alternative isn't permitted, pause the workflow and seek an authorized choice.
Treat each rehearsal as an independent test, not a blanket approval for all tasks. Even if one test passes, further investigation may be needed. Keep all test data and review decisions together for clarity and accountability.
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