Anthropic's Claude Opus 4.7 Model Card analysis reveals significant concerns about model welfare that warrant separate investigation.

Anthropic released Claude Opus 4.7 with a 232-page Model Card less than a week after completing Claude Mythos coverage

First post covers only the first six sections of the Model Card, deliberately excluding sections seven and eight for separate analysis

Model welfare section (section seven) shows problems that are more serious than in previous Claude models, requiring its own dedicated investigation post

Capabilities section (section eight) will be covered in a separate post expected by Wednesday as part of the standard analysis process

The full analysis is being split into multiple posts to properly address emerging issues rather than presenting a single overview