Why Claude Opus 4.7 System Card is 232 Pages
What is this A system card is a technical document Anthropic publishes for every Claude release, documenting capabilities, safety evaluations, and deployment decisions. Opus 4.7’s card (April 2026) is 232 pages — unusually thick. This note explains what fills those pages, and what that implies about how Anthropic actually operates. The short answer It’s not a “model card” in the academic-paper sense. It’s a cross-audit: nine orthogonal risk/capability domains, each with its own evaluation methodology, external verifications, failure-case transcripts, and comparisons against both the prior model (Opus 4.6) and a more capable internal model (Mythos Preview). Each domain could be its own paper; they bind them into one document so the full picture is visible. ...