Who Owns Content Generated by Claude AI? Output Ownership, Copyright & Commercial Use

I publish illustrative scenarios prepared by my practice. All participants and conversations are fictional. The fictional posts are not posts by real users, accounts of client experiences, or reports of actual results.
Illustrative scenario prepared by my practice.
For informational purposes only. Terms of service may change - always check current versions.
Hypothetical question

On mobile so apologies for formatting. I’m a freelance copywriter and I’ve been using Claude heavily to draft blog posts and email sequences for clients. A client just asked me point-blank whether I “own” the content I deliver and whether they’re getting full rights. I honestly didn’t know how to answer.

Anthropic’s Terms of Service say something about users retaining rights to outputs, but does that actually hold up legally? Can I sell Claude-generated content to clients as if it were my own work? Is there any risk Anthropic could claim ownership later? I need to understand this before I keep building my business on top of Claude.