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OpenAI teases GPT-5.5 model upgrade for ChatGPT in cryptic message

OpenAI 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.

“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.

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Avatar for Zac Hall Zac Hall

Zac covers Apple news, hosts the 9to5Mac Happy Hour podcast, and created SpaceExplored.com.