OpenAI has introduced GPT-5.5 Instant, replacing GPT-3.5 Instant as the default model in ChatGPT. The update signals a shift to a newer “instant” experience aimed at quicker, more capable responses for everyday prompts. For most users, the change is likely seamless, with ChatGPT automatically routing requests to the new default model.
OpenAI is starting a limited rollout of its cybersecurity testing tool, GPT-5.5 Cyber, initially only for “critical cyber defenders.” The move comes as the company faces scrutiny over how tightly it controls access to advanced AI capabilities. The initial restriction suggests a cautious, gatekept approach while OpenAI gathers feedback from specialized security teams.
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OpenAI has released GPT 5.5, positioning it as another step toward an AI “super app.” The company says the new model delivers increased capabilities across a wide range of categories, signaling a broader shift from single-purpose chat toward more general, app-like AI experiences. Details on performance and use cases are expected to follow as adoption ramps.
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