ChatGPT announced that on October 14, 2026, GPT-5.5 will leave ChatGPT, ChatGPT Work, and Codex across all plans; Codex users should switch to GPT-5.6 Sol or GPT-6 Astra. OpenAI Developers clarified that GPT-5.5 remains available via the OpenAI API Platform and in Codex sessions authenticated with an API key.

Key Takeaways

  • ✓Oct 14: GPT-5.5 exits ChatGPT, ChatGPT Work, and Codex across all plans.
  • ✓Codex plan users should move to GPT-5.6 Sol or GPT-6 Astra.
  • ✓GPT-5.5 stays on the API Platform and in API-key-authenticated Codex sessions.
⚡

Key Decision Metrics at a Glance

TL;DR Verdict
🏆 Benchmark RankRank
See how it ranks on the leaderboard
Full Leaderboard→
💰 Cost & PlansCompare
GPT-5.6 Sol · in: $5 / out: $30
Compare Plans↗
🛠️ Ecosystem & IDERules
GPT-5.5 · GPT-5.6 Sol · GPT-6 Astra
Setup IDE Rules↗
🧭

Turn your technical choice into a development budget

Compare 40 dev plans & simulate token costs vs $20/mo subscriptions

⚔️ Compare Model→💰 Compare plans & limits↗
Action HubReady to adopt this in production?

Benchmark side-by-side against alternatives, or calculate monthly token cost vs subscription break-even.

⚔️ Launch VS Compare→💳 View Plans↗
Up NextGPT-5.5 retires from ChatGPT, ChatGPT Work and Codex today: ChatGPT sign-in users must move to gpt-6-sol or gpt-6-luna, the API is unaffected
Read Now→