GPT-5.4 Mini — OpenAI's Fastest Agentic Coding Model Yet — Is Now GA in GitHub Copilot
Source: GitHub Changelog
GPT-5.4 mini, described as OpenAI's highest-performing mini model to date, is now generally available across all GitHub Copilot tiers — Pro, Pro+, Business, and Enterprise — and works in VS Code, JetBrains, Visual Studio, GitHub CLI, and GitHub Mobile. It offers the fastest time-to-first-token among mini models, improved codebase exploration, and strong performance on grep-style tool use. In Codex, it counts as 30% of the standard GPT-5.4 quota.
Why it matters: Broadly available across every Copilot plan, GPT-5.4 mini lets even free-tier developers experience a genuinely fast agentic coding model — raising the floor for the entire developer AI experience.
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