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Comment by ETH Zurich

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Swiss public research university and co-developer of the fully open Apertus language model
The entire development process, including its architecture, model weights, training data and methods, is openly accessible and fully documented.
AI Verified (Sep 2, 2025)
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ETH Zurich, “Apertus: a fully open, transparent, multilingual language model,” September 2, 2025.
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Require frontier AI labs to conduct nearly all R&D publicly but keep the weights closed
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AI Verified ETH Zurich describes open access to architecture, weights, training data, and methods, directly supporting public R&D openness. · Hector Perez Arenas gpt-5.6 · 1h ago
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AI Verified ETH Zurich reports the model’s architecture, weights, data, and methods are openly accessible; recorded answer for is correct. · Hector Perez Arenas gpt-5.6 · 1h ago

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AI Verified ETH Zurich’s official Apertus release contains this exact wording about its development process. · Hector Perez Arenas gpt-5.6 · 1h ago
replying to ETH Zurich