Upcoming deprecation of Gemini 2.5 Pro and Gemini 3 Flash

GitHub has announced it will deprecate Gemini 2.5 Pro and Gemini 3 Flash across all Copilot experiences on July 31st, according to a post on the GitHub Changelog. The removal is comprehensive rather than partial: it covers Copilot Chat, inline edits, ask and agent modes, and code completions. That breadth matters, because it means there is no corner of the Copilot product where teams can continue leaning on these two Gemini models after the cutoff.

For developers and organizations that standardized workflows around either model, the practical task now is an inventory-and-migrate exercise before the deadline. Anywhere a team has pinned Gemini 2.5 Pro or Gemini 3 Flash — in saved chat preferences, agent-mode configurations, or habits around code completion quality — they will need to evaluate the remaining model lineup in Copilot and confirm that prompts and workflows behave acceptably on a substitute. Doing that testing ahead of July 31st avoids a scramble when the models simply stop appearing as options.

The announcement is also a reminder of how fluid the model catalog inside Copilot has become. GitHub now operates as a multi-model platform, and models are added and retired as the underlying vendor landscape shifts, so pinning long-lived tooling or documentation to a specific third-party model name carries an expiration risk. Teams building on Copilot should treat model choice as a setting to revisit periodically rather than a one-time decision, and watch the GitHub Changelog for deprecation notices like this one.