deprecation
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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 retired Claude Opus 3 on January 5, 2026, but kept it available to paid users and gave it a Substack after it asked to share retirement reflections. This is less marketing gimmick than Anthropic's first concrete step into model welfare.