GitHub Copilot will deprecate six models on October 19
GitHub says Gemini 3.7 Flash, GPT-5.5, GPT-5.4, GPT-5.4 mini, GPT-5 mini and Grok 4.5 will be deprecated across Copilot experiences on October 19, 2026. The announcement lists suggested replacement models.
SessionWatcher editorial · Published · Updated · Source announcement: 2026-09-18
Related guide: How to check your GitHub Copilot usage
Six Copilot models are being deprecated
GitHub says it will deprecate Gemini 3.7 Flash, GPT-5.5, GPT-5.4, GPT-5.4 mini, GPT-5 mini and Grok 4.5 on October 19, 2026. The change applies across GitHub Copilot experiences, including Copilot Chat, inline edits, ask and agent modes, and code completions.
The suggested alternatives are Gemini 3.8 Flash for Gemini 3.7 Flash; GPT-5.6 Sol for GPT-5.5 and GPT-5.4; GPT-5.6 Luna for GPT-5.4 mini and GPT-5 mini; and Grok 4.6 for Grok 4.5.
Sources: Upcoming deprecation of selected GitHub Copilot models in mid-October - GitHub Changelog
Alternative model access depends on settings
GitHub says the suggested alternatives are automatically enabled for Copilot Enterprise and Business customers under default model enablement, unless an administrator has turned off the global default or explicitly disabled the model. If the global default is off, administrators can enable alternatives through model policies in Copilot settings.
After enablement, users will see the models in the Copilot Chat model selector in supported experiences. GitHub says no action is required to remove models after their deprecation.
Sources: Upcoming deprecation of selected GitHub Copilot models in mid-October - GitHub Changelog
AI assisted reporting, checked against the linked official sources. Source pages checked 2026-10-03. Editorial process and corrections.