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Claude 4.5 Opus

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2025-12-02
Simon Willison's Weblog 3 related

A Claude user gets Claude 4.5 Opus to generate a 14K-token document that Claude calls its “Soul overview”; an Anthropic employee confirms the doc's validity

This appeared to be a document that, rather than being added to the system prompt, was instead used to train the personality of the model during the training run.

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