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Anthropic's Internal Leak Exposes 'Claude Mythos,' A Powerful New AI Model Surpassing Opus 4.6, As OpenAI Quietly Preps 'Spud' Ahead Of Rival IPOs

Anthropic's Internal Leak Exposes 'Claude Mythos,' A Powerful New AI Model Surpassing Opus 4.6, As OpenAI Quietly Preps 'Spud' Ahead Of Rival IPOs

Mar 28, 2026
The Decoder

Anthropic's accidental leak of nearly 3,000 internal files reveals 'Claude Mythos,' a powerful new AI model surpassing Opus 4.6 in coding, reasoning, and cybersecurity, while OpenAI quietly prepares a rival model codenamed 'Spud' — with both companies racing to launch flagship models ahead of their anticipated IPOs.

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