Why does Opus talk like that

Users are questioning why Claude models, especially Opus 5, exhibit a distinct and often difficult-to-understand "AI slang" characterized by weird jargon and convoluted sentences. This style is perceived as a recent development, contrasting with earlier models like ChatGPT 4o. While some suggest it's due to replicating training data patterns, users argue that no one writes like this, making it hard to comprehend. Similar tendencies are noted in Kiki K3, with a concern that newer models are increasingly adopting this "slop sing song" style.

This report highlights a user-perceived decline in Claude Opus 5's output quality, unlike earlier models like ChatGPT 4o, which exhibited less "AI slang" and convoluted language.