GitHub Copilot – August 2026 model deprecations [Closing Down]

### Value Prop
GitHub Copilot is updating its model lineup on August 31, 2026 to keep you on the most capable and actively supported AI models available. Six older models will be retired, with newer alternatives ready to take their place — offering improved performance across coding, chat, and agent workflows. A 30-day advance notice gives you and your team time to review any workflows or integrations that reference specific models and update them before the change takes effect.

### Expected Outcome
By consolidating the Copilot model portfolio around newer, higher-quality models, you get a simpler, more consistent experience without having to navigate deprecated or lower-priority options. The migration guidance and notice period are designed to make the transition smooth, so your integrations and model policies continue working without disruption.

该 issue 未指出任何源文件、测试或实现入口。首先查看路线图条目以及针对六个即将停用模型的迁移指南；由于该 issue 描述的是通知而不是仓库变更，因此没有定义完成标准。

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