Simon Willison / Simon Willison's Weblog:
A Claude user gets Claude 4.5 Opus to generate a 14,000-token document that Claude calls its “Soul overview”; an Anthropic staffer confirms its authenticity — 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.
Posted from: this blog via Microsoft Power Automate.