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OpenAI/GPT-5.5 / GPT-6.1 Sol / Codex / GitHub Copilot

GPT-5.5 Leaves Codex on October 14: What to Switch to and What to Fix

GPT-5.5 leaves ChatGPT, ChatGPT Work and Codex on October 14, and GitHub Copilot drops it on October 19. For Codex, switch to GPT-6.1 Sol (gpt-6.1-sol). Here's what breaks if gpt-5.5 is pinned in config or scripts, and what stays the same.

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OpenAIGuides2026-10-09

GPT-5.5 Leaves Codex on October 14: What to Switch to and What to Fix

GPT-5.5 leaves ChatGPT, ChatGPT Work and Codex on October 14, and GitHub Copilot drops it on October 19. For Codex, switch to GPT-6.1 Sol (gpt-6.1-sol). Here's what breaks if gpt-5.5 is pinned in config or scripts, and what stays the same.

GPT-5.5 / GPT-6.1 Sol / Codex / GitHub CopilotRead story