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Anthropic's Mythos 5 "Numbat" model checkpoint leaked online

By PulseAugur Editorial · [1 sources] ·

A leaked checkpoint for Anthropic's unreleased "Numbat" model, internally codenamed Mythos 5, has surfaced. The checkpoint, totaling approximately 7.72 TB across 772 shards, is a mid-pretraining artifact from a large-scale training run. It includes a complete reference implementation of the model's architecture, which features a hybrid Gated DeltaNet (GDN) and Multi-head Latent Attention (MLA) stack with Mixture-of-Experts layers. AI

IMPACT Potential early access to Anthropic's next-generation model architecture and capabilities.

RANK_REASON Leaked checkpoint of a next-generation model from a frontier lab. [lever_c_demoted from frontier_release: ic=1 ai=1.0]

Read on r/Anthropic →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Anthropic's Mythos 5 "Numbat" model checkpoint leaked online

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Signal score
0 / 100
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Newsworthiness bucket
Significant
Leaked checkpoint of a next-generation model from a frontier lab. [lever_c_demoted from frontier_release: ic=1 ai=1.0]
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
model release, infra
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AI-industry relevance
High
Clearly on-topic for AI-industry coverage.
Story freshness
Same-day
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Full methodology in our editorial standards.

COVERAGE [1]

  1. r/Anthropic TIER_1 English(EN) · /u/GLR1997 ·

    Numbat its a Mythos 5 for localhost? Leak?

    <!-- SC_OFF --><div class="md"><p>numbat ~14T param, 114 layers, hybrid GDN/MLA, MoE (1,224 experts, top-48 + 1 shared), NVFP4.</p> <p>Internal codename `numbat`, Anthropic's next Mythos-class training run</p> <p>`numbat` is the codename referenced in the Claude Code source leak …

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