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Rubber Duck in GitHub Copilot CLI now supports more models - GitHub Changelog

Back to changelog Rubber Duck , the cross-family review agent in GitHub Copilot CLI , is now available using a Claude-powered critic agent when your session is using a GPT model. For sessions using Claude as their orchestrator, we’ve upgraded the GPT model used to seek a second opinion. …

May 7, 2026 · Allison

github.blog › changelog

GPT-5.4 mini is now generally available for GitHub Copilot - GitHub Changelog

Back to changelog GPT-5.4 mini, OpenAI’s latest fast version of their agentic coding model GPT-5.4, is now rolling out in GitHub Copilot. In early tests, GPT‑5.4 mini appears to be OpenAI’s highest-performing mini model yet. …

Mar 17, 2026 · Kate Catlin