GoKawiilOpenAI is expected to be nearing an announcement around GPT-5.5, its next model upgrade to ChatGPT. A cryptic post on X includes a hidden teaser, suggesting the news is coming soon.
NS41 is the key to OpenAI’s hidden message
The message from OpenAI on X simply reads “NS41” with no additional context. Fortunately, some of the replies explain the hidden meaning found in those four characters.
NS41 — OpenAI Developers (@OpenAIDevs) April 23, 2026
“The text NS41 in the tweet is a Base64-encoded string,” says Razvan Girgiz. “When decoded, it reveals: 5.5”
Another X user named Nic translates each character.
N = 14, S = 19 19 – 14 = 5 4 + 1 = 5 so NS41 = 5.5
So there we have it: OpenAI is readying the launch of GPT-5.5, it seems.
The announcement will follow a busy few days for the company. Last week, Codex for Mac was overhauled with computer use and more features that go beyond agentic coding.
This week, OpenAI released the vastly better ChatGPT Images 2 for higher quality image generation.