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Anthropic's Numbat model checkpoint leaked online

A leaked checkpoint for Anthropic's unreleased "Mythos-class" model, codenamed Numbat, has surfaced online. The checkpoint, which is approximately 7.72 TB and contains 142 tensors, is described as a mid-pretraining artifact from a large-scale training run. While it includes a reference implementation for loading and running the model, it is raw pretraining output without any post-training or RLHF, making it unsuitable for direct inference. AI

IMPACT Leaked model checkpoints can offer insights into frontier model architectures and training techniques, potentially accelerating research.

RANK_REASON This is a leaked checkpoint of an unreleased model, not an official release from the lab.

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Anthropic's Numbat model checkpoint leaked online

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This is a leaked checkpoint of an unreleased model, not an official release from the lab.
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COVERAGE [1]

  1. HN — anthropic stories TIER_1 English(EN) · explosion-s ·

    Alleged Mythos Class Anthropic Checkpoint Leak