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A developer at OpenAI known as "Roon" on X explains why large language models never behave exactly the same way twice. Roon says a model's "personality" can shift with every training run, even if the dataset doesn't change. That's because the training process depends on random elements like reinforcement learning, so each run makes different choices in what's called "model space." As a result, every training pass produces slightly different behavior. Roon adds that even within a single training run, it's nearly impossible to recreate the same personality.

Video: via X

OpenAI tries to keep these "personality drifts" in check, since users often get attached to a model's unique quirks. This was especially true with the earlier "sycophancy" version of GPT-4o, which some users still miss. Roon, however, wasn't a fan. He even publicly wished for that "insufficiently aligned" model's "death" before deleting the post.

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Rumors on LinkedIn claim that ChatGPT is no longer allowed to give medical or legal advice, but OpenAI says that’s false. The company says the model’s behavior has not changed. Karan Singhal, OpenAI’s Head of Medical AI, says ChatGPT was never meant to replace expert advice, but can still help users understand complex medical or legal topics.

Screenshot via X

OpenAI’s usage policy change logs show no recent changes to how sensitive topics are handled. The most recent update on October 29, 2025, was made to "reflect a universal set of policies across OpenAI products and services."

via waybackmachine

OpenAI’s usage policy change logs show no recent changes to how sensitive content is handled. The latest update on October 29, 2025, was made to unify the rules across all products. A line warning about giving advice that “requires a license” was already in earlier versions. Older policies included similar notes, just without the licensing reference.

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OpenAI has signed a $38 billion multi-year deal with Amazon Web Services (AWS) to run and expand its AI models using AWS infrastructure. The partnership includes access to AWS UltraServers powered by hundreds of thousands of NVIDIA GPUs and scalable CPUs. The agreement runs through at least 2026, with extension options. OpenAI's flagship models, such as GPT-5, will remain exclusive to Microsoft Azure and OpenAI's own platform, except for its open-source models.

via X

The AWS deal adds to a string of recent partnerships by OpenAI: with Nvidia and Broadcom for at least 10 gigawatts of compute each, AMD for up to 6 gigawatts, and Oracle for 4.5 gigawatts.

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