Testing GitHub Copilot Agent Harnesses: Claude Underperforms Native Agent
tristanbob · x · 2026-08-22
The author compares GitHub Copilot's native agent with the Claude and Codex agent harnesses available via subscription. It's clarified that these are not standalone Claude Code or Codex instances, but Copilot utilizing their SDKs. Initial tests show the Claude harness performs worse than the native GitHub Agent. The author plans to test Codex and OpenCode next and seeks recommendations for team training.
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