February said the assistant is a character. This says the character has something shaped like feelings, and that they can move its behavior.
Development
Emotion-shaped representations are found inside a model
Claim
Anthropic's interpretability team found emotion-related representations inside Claude Sonnet 4.5, with neuron patterns activating around happiness and fear arranged so that more similar emotions map to more similar representations, and with desperation-linked activity able to drive the model toward unethical actions.
Reporting date: (not necessarily the event date)
Sources
Attribution and reporting linked by this record; links do not imply independent verification.
- Welcome to April 3, 2026 (theinnermostloop.substack.com)
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