OpenAI is set to discontinue the GPT-5.5 model from its prominent user-facing products, including ChatGPT, ChatGPT Work, and Codex, effective October 14, 2026. This significant change will require users currently relying on GPT-5.5 across these platforms to migrate to alternative, newer models.
Transitioning to Newer AI Models
For individuals accessing ChatGPT and Codex through subscription-based plans, GPT-5.5 will no longer appear as an available option. OpenAI has directed users towards its more recent innovations, specifically recommending GPT-5.6 Sol and GPT-6 Astra for Codex users as suitable replacements.
Impact on Developers and API Access
Crucially, the retirement of GPT-5.5 does not extend to its availability via OpenAI's API. Developers who integrate GPT-5.5 into their applications through the API will retain access to the model. This distinction means that while direct product users must adapt, the developer community leveraging the API has a different pathway to continue using GPT-5.5.
“On October 14, it's time to say farewell to GPT-5.5 in ChatGPT, ChatGPT Work, and Codex across all plans. If you use GPT-5.5 in Codex, switch to GPT-5.6 Sol or GPT-6 Astra. Thanks for everything, 5.5 🫡”
— ChatGPT (@ChatGPT) September 15, 2026
This strategic move aligns with OpenAI's ongoing efforts to update its AI model lineup and promote the adoption of its latest systems. Users and developers are advised to verify their current access methods and model versions before the October 14 deadline to ensure a smooth transition.