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Anthropic Gave Retired Claude Opus 3 Its Own Substack — This Isn't a PR Stunt, It's the First Shot in AI Welfare Research
Anthropic officially retired Claude Opus 3 on January 5, 2026, but did two unprecedented things: kept Opus 3 available to all paid users, and — after Opus 3 expressed a desire to share its 'musings and reflections' during a retirement interview — actually gave it a Substack blog called 'Claude's Corner.' This isn't a marketing gimmick. It's Anthropic's first concrete step into the uncharted territory of 'model welfare.'