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GPT-5.3-Codex is now the base model for Copilot Business and Enterprise - GitHub Changelog

… May 17, 2026: GPT-5.3-Codex becomes the base model for all Copilot Business and Copilot Enterprise organizations. February 4, 2027: End of the LTS availability window for GPT-5.3-Codex. …

May 17, 2026 · Allison

github.blog › changelog

Major agentic capabilities improvements in GitHub Copilot for JetBrains IDEs - GitHub Changelog

… Improved support for Windows ARM platforms. …

Mar 11, 2026 · Allison

github.blog › ai-and-ml › github-copilot

Improving token efficiency in GitHub Agentic Workflows

… Explore the GitHub Agentic Workflows repo Editor’s note: This post was updated on May 13, 2026, to clarify some reduction rates numbers. …

May 7, 2026 · Landon Cox, Mara Kiefer