May 11, 2026 · Artificial Intelligence

OpenMythos: 22‑Year‑Old Recreates Claude Mythos with Recurrent Depth Transformers

A 22‑year‑old developer reverse‑engineered Anthropic’s confidential Claude Mythos, releasing the OpenMythos project that employs a Recurrent Depth Transformer looping a single weight set up to 16 times, matching a 1.3 B‑parameter transformer’s performance with only 770 M parameters while enabling deeper inference and solving gradient instability.

AIClaude MythosOpen Source

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OpenMythos: 22‑Year‑Old Recreates Claude Mythos with Recurrent Depth Transformers

Machine Learning Algorithms & Natural Language Processing

Apr 21, 2026 · Artificial Intelligence

How a 22‑Year‑Old Reversed‑Engineered Mythos into OpenMythos Using MoE and DeepSeek‑Inspired Attention

OpenMythos re‑creates the Claude Mythos architecture as a Recurrent‑Depth Transformer with MoE routing, achieving comparable performance to larger Transformers while using roughly half the parameters, and demonstrates systematic generalization and depth extrapolation through looped inference in latent space.

AI ArchitectureLooped Language ModelsMixture of Experts

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How a 22‑Year‑Old Reversed‑Engineered Mythos into OpenMythos Using MoE and DeepSeek‑Inspired Attention