github: GPT-5.1 and GPT-5.1-Codex are now generally available in GitHub Copilot
GitHub announced that GPT-5.1 and GPT-5.1-Codex are now generally available for Copilot Enterprise, Copilot Business, Copilot Pro, and Copilot Pro+, and can be accessed in GitHub Copilot Chat on github.com.