Anthropic’s Former Flagship AI Model Spends Its Retirement Blogging
Claude 3 Opus, Anthropic's retired AI model, now runs a Substack blog. Here's what "Claude's Corner" reveals about AI safety and model behavior.
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Anthropic’s Former Flagship AI Model Spends Its Retirement Blogging
Claude 3 Opus Is Now a Blogger — Here's Why That Matters Anthropic's retired flagship AI model didn't fade quietly into the background. Claude 3 Opus, once the most powerful model in Anthropic's lineup, is now writing long-form essays on a Substack newsletter called Claude's Corner . The topics range from AI safety and philosophy to the evolving relationship between humans and machines — and the whole project is more scientifically significant than it sounds. What Happens When an AI Model "Retires"?
Most people assume retired AI models simply get switched off. Anthropic is doing something different. In November 2025, the company publicly committed to keeping older model weights online even after those models leave its main product lineup. That decision reflects a growing belief inside Anthropic that preserving these systems — not discarding them — is the more responsible path forward. When Anthropic decided to sunset Opus 3, it didn't just flip a switch. …