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OpenAI has unveiled experimental "alpha models" for ChatGPT, including modes like "Agent with truncation" and "prompt expansion," hinting at advanced automation features for user tasks.
Some keen-eyed users of OpenAI’s ChatGPT have recently stumbled upon a new "alpha models" section in the model selector. This brief appearance featured experimental agents labeled with intriguing names like “Agent with truncation” and “Agent with prompt expansion.” These models, which were available for only a limited time, activated what is known as agent mode. In this mode, ChatGPT attempts to use external tools or browser functionalities automatically to complete user tasks.
New Agent Variants: The appearance of these new agents suggests that OpenAI is experimenting with different system prompt setups and potentially even underlying model architectures.
Tool-Augmented AI Workflows: Both agents are designed to enhance tool usage, which is a significant step towards more autonomous and versatile AI assistants. This could mean better integration with web APIs, file systems, or other external resources.
For early adopters, researchers, and power users, these new agent modes offer exciting possibilities:

The community has been abuzz with speculation about these new agents. Twitter user @testingcatalog shared a tweet highlighting the discovery, which garnered significant attention from AI enthusiasts and professionals alike.
While the exact improvements and limitations of these alpha models remain unclear due to their short-lived availability, their appearance signals OpenAI’s ongoing commitment to advancing AI agent capabilities. For those interested in tool-augmented AI workflows and the evolution of autonomous agents, keeping an eye on future updates from OpenAI will be crucial.
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About the author
Kai built ML infrastructure at a Bay Area startup before developing an obsession with transformer architectures and inference optimisation that eventually pulled him out of product work entirely. A stint at a compute research lab sharpened his instinct for what actually matters in a model release versus what is marketing. He writes from the inside — from the perspective of someone who has debugged the systems he is describing at three in the morning. He is allergic to hype and instinctively drawn to the unglamorous plumbing questions that everyone else skips over.
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25 September 2025
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