GPT-5.5 retires October 14 as users move to Sol or Astra

Astro Polo @astropol0Originally posted 2026.09.16

Open original on X

thanks for everything GPT-5.5.... OpenAI is officially killing it on October 14 in ChatGPT, Work, Codex across every plan Codex users get pushed to GPT-5.6 Sol or GPT-6 Astra crazy that GPT-5.5 shipped on April 23 thats literally five and a half months as a named frontier

This post quotes another post: “ChatGPT to retire GPT-5.5 on October 14”