GitHub Weekly: Agentic Workflows Hit Prime Time

The Agentic Takeover is Real This week, GitHub shipped a flood of updates that make one thing clear: the platform is doubling down on agentic automation across the board. From GPT-5.4 going generally available in Copilot to custom agents landing in JetBrains IDEs, GitHub is moving fast to turn AI from a code-completion tool into an actual development partner. At the same time, they're hardening security workflows and fixing long-standing friction points in Actions and issue tracking. Here's what shipped and why it matters. GPT-5.4 is Now Generally Available in GitHub Copilot OpenAI's latest agentic coding model, GPT-5.4 , is now rolling out to Copilot Pro, Pro+, Business, and Enterprise users. Early testing shows it's hitting "new rates of success" for multi-step, tool-dependent processes—exactly what you need when Copilot is opening PRs, running tests, and debugging issues autonomously. GPT-5.4 is available in the model picker across VS Code, Visual Studio, JetBrains, Xcode, Eclipse,