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Over the weekend, speculation quickly spread on social media about a powerful new AI model called GPT-4.5, which was being secretly rolled out by leading AI lab OpenAI. However, OpenAI CEO Sam Altman was quick to dismiss the rumors, despite some users reporting big improvements with OpenAI’s ChatGPT tool.
The speculation began Thursday when an image was posted to Reddit claiming to show details of a new GPT-4.5 model that would provide advanced multimodal capabilities far beyond what current AI systems can do. The leaked image also showed pricing details, with the most expensive level allowing for 100 billion parameter models.
OpenAI CEO Sam Altman immediately responded “nah” when asked on Twitter if GPT-4.5 was real. Other AI experts also questioned the validity of the leaked image, pointing out quirks such as pricing that didn’t match OpenAI’s usual structure.
But the rumors did not die away so easily. Anonymous sources began to respond, claiming that Altman was just trolling and that GPT-4.5 was in fact real and being tested behind the scenes.
Then over the weekend, multiple users on Reddit and Twitter started reporting that something strange was happening with ChatGPT, OpenAI’s conversational AI bot. When users asked ChatGPT what current model it was running, it responded with “GPT-4.5 turbo,” fueling the speculation.
However, an OpenAI employee responded that these were probably just “hallucinatory” weird responses from ChatGPT, as AI models sometimes do.
Still, many users claim that ChatGPT has seen major improvements in recent days, making it respond faster and more accurately to complex prompts. This is consistent with past patterns when OpenAI has made silent upgrades to ChatGPT.
Throughout all of this, the official ChatGPT Twitter account has been posting vague, cryptic emoji tweets, leading some to believe they’re teasing something big on the horizon.
So while Altman continues to shut down the GPT-4.5 rumors for now, it appears that ChatGPT recently received an upgrade that has led to better performance. This indicates that OpenAI continues to innovate rapidly behind the scenes, even though a full GPT-4.5 launch may not be imminent.
AI experts say the leaked details about GPT-4.5 are consistent with the direction they would expect from OpenAI. Capabilities like multimodal understanding and 100 billion parameter models are natural next steps as computing power grows.
“The described options for GPT-4.5 fit in well with the trajectory that OpenAI had already completed. So while this particular leak may not have been real, it undoubtedly reflects where leading AI labs like OpenAI plan to use generative models. We may not necessarily get a ‘GPT-4.5’, but expect rapidly growing capabilities soon.”
Dr. Emma Tosch, AI professor at MIT.
Of course, advanced AI, like what GPT-4.5 promises, carries risks if not carefully developed. OpenAI has previously been criticized for releasing tools too hastily without sufficient security measures.
“AI tools today still have serious limitations, meaning real-world applications must be executed with caution. So I caution against excessive excitement and speculation surrounding leaked details or rumors. What matters is that institutions like OpenAI take the time to develop future generations of AI responsibly.”
Ben Zhao, professor of computer science at the University of Chicago
So while GPT-4.5 itself seems to be more rumor than reality for now, it’s clear that OpenAI continues to push boundaries at a dizzying pace. Users can expect continued upgrades that unlock new capabilities, even if the timing remains uncertain. For any major leap forward, OpenAI will need to demonstrate responsible development so that new AI continues to drive positive progress.
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