Copilot Connects to Grok 4.5 and Claude Opus 5 in July, IDE Becomes a Battlefield for Agent Model Selection

On July 24 and 28, 2026, GitHub's official Changelog consecutively announced that Claude Opus 5 and Grok 4.5 have been integrated into GitHub Copilot, and users can switch between them via the model selector in VS Code, Copilot CLI, JetBrains and other entry points. Opus 5 is designed for complex long-chain Agent tasks, while Grok 4.5 boasts a maximum context window of 500,000 tokens and parallel tool calling. For Business/Enterprise plans, the feature requires administrators to enable the relevant policy, and Grok 4.5 is disabled by default. This article sorts out the access scope, plan differences, billing methods and selection references based on the official announcements.