OpenAI teases GPT-5.5 model upgrade for ChatGPT in cryptic message
By Zac Hall
Published on April 23, 2026.
OpenAI is expected to announce the GPT-5.5, its next model upgrade to ChatGPT. The company's cryptic message on X, which simply reads "NS41" without context, was revealed through a hidden teaser. The announcement follows a series of developments in the company's Codex for Mac, which was overhauled with computer use and more features.
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