How to use Claude, Codex, and BYOK in GitHub Copilot for VS Code | GitHub Copilot Day

VS Code now gives developers more choice in how they build, with support for multiple agent harnesses and bring your own key (BYOK) options. In this GitHub Copilot Day session, Tyler Leonhardt explores the Copilot, Claude, and Codex agent harnesses and the different ways to access models. Learn how each harness brings its own prompts and tools to your workspace, and how a single GitHub Copilot subscription lets you work with all three.



▬▬▬▬▬▬ WANT TO LEARN MORE? 🚀 ▬▬▬▬▬▬



Learn more about HydraFusion https://gh.io/ghcpdayhydrafusion

Get hands-on with the Copilot app https://gh.io/ghcpdaycopilotapp

Check out Copilot app resources https://gh.io/ghcpdaycopilotappresources

Install the GitHub Copilot CLI https://gh.io/ghcpdaycopilotcli

Check out GitHub Copilot Dev Days! https://gh.io/join-dev-days



▬▬▬▬▬▬ TIMESTAMPS ⌚ ▬▬▬▬▬▬



0:00 Intro: two kinds of freedom

0:31 BYOK: bring your own key

0:54 Agent choice in VS Code

1:37 Demo plan: three harnesses, three providers

2:27 The agents window in VS Code

2:52 Adding models via OpenRouter

3:38 Each harness brings its own tools

4:00 Running Claude with an Anthropic key

4:45 Signing into Codex with ChatGPT

5:32 One Copilot subscription for all harnesses

6:46 Demo recap

7:38 What's next: Agent Host Protocol



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