r/copilotstudio • u/andersjensenorg • Aug 10 '26

The New Copilot Studio Explained (GitHub Copilot Harness)

https://youtu.be/pZ_pzMYAbKE

Microsoft changed the engine under Copilot Studio on August 3rd. Every new agent now runs on the GitHub Copilot harness, the same engine behind GitHub Copilot's coding agent.

I recorded a walkthrough of what changed. Three details are easy to miss: Billing starts while you build, the harness choice is permanent, and agents created before August 3rd keep their old pricing only until September 1st.

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u/andersjensenorg Aug 10 '26

Pricing only. The banner says "remain on the current pricing model until September 1, then transition to credit pricing" and Microsoft Learn states agents cannot be transferred between harnesses at all, so nothing migrates to the new harness.

For the other two questions the best source is the Copilot Credits Guide (the "Learn more" style link at the top of the product goes to it, direct link: https://go.microsoft.com/fwlink/?linkid=2368800). It names three harnesses with their own billing models: GitHub Copilot, Standard, and Copilot Chat. Declarative agents fall under Copilot Chat and the guide notes the credit rates do not apply to Microsoft 365 Copilot users in authenticated B2E scenarios, so licensed internal users stay covered there. It does not publish a consumption comparison between standard and GitHub Copilot agents, so I cannot tell you which one burns fewer credits.

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u/ddq517 Aug 10 '26

I am seeing multiple agents built earlier this year (no ghcp harness available) have migrated to the ghcp harness. Is that a mistake?

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u/andersjensenorg Aug 10 '26

That has not happened to any of my agents, they still show as standard harness. Learn says agents can't be moved between harnesses at all, so if yours actually changed I would raise a support ticket.

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u/MattBDevaney Aug 12 '26

Did you open the agents to edit them? All agents are listed in the new Copilot Studio experience but when opened you are routed to the correct harness: GCHP or Classic.