GPT-5.4 mini, OpenAI's latest fast agentic coding model, is now rolling out in GitHub Copilot. It offers the fastest time to first token among mini models, improved codebase exploration, and strong performance with grep-style tools. Available to Copilot Pro, Pro+, Business, and Enterprise users across VS Code, Visual Studio, JetBrains, Xcode, Eclipse, github.com, GitHub Mobile, and GitHub CLI. A 0.33x premium request multiplier applies, though pricing is tentative. Enterprise and Business admins must enable the model via Copilot settings before users can access it.
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