[AINews] 10% worse, 100x cheaper, 10000x faster: Why Simulation is taking over

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By AI standards today is a pretty quiet Friday, so it’s time to take a step back and reflect on what is really going on. If you read our 2025 reading list, and followed our coverage of Z.ai GLM, understood the Poolside pivot, been following our AI for Science themes, and tuned in to today’s Simile pod, you not only are one of the biggest readers of Latent Space, you will probably also arrive at this mental model:Every year since 2022, one more component of the pipeline that produces machine intelligence has flipped from human-made to model-made. Not gradually, and not evenly — each flip has a patient zero, a paper or product where the synthetic version first became load-bearing at a frontier lab, and from there on, the future is simply here but not yet productionized.And if you squint, what we used to call “synthetic data” and “synthetic rubrics” and “AI researcher” and “end to end RL environments” is just increasingly ambitious human simulation - 10% worse, but 100x cheaper and 10,000x faster.Stage 1: The reward signal (2022)The first thing to go synthetic was, counterintuitively, the judge. InstructGPT established the now-canonical trick: collect human preferences once, train a reward model, and let the policy optimize against the model rather than the humans. From the policy’s point of view, the thing dispensing approval was already an LLM. Constitutional AI pushed further and had the AI critique itself against a set of principles (RLAIF), and Lee et al. later showed AI feedback matching human feedback at a fraction of the cost. By the time LLM-as-judge became the …

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