github: GPT-5.1 Codex, GPT-5.1-Codex-Max, and GPT-5.1-Codex-Mini deprecated

GitHub deprecated GPT-5.1 Codex, GPT-5.1-Codex-Max, and GPT-5.1-Codex-Mini across all GitHub Copilot experiences on April 1, 2026. The change applies to Copilot Chat, inline edits, ask and agent modes, and code completions.

• Source: GitHub