Vibe Check: Sonnet 5.5 Finds Its Place in Claude’s Crowded Family
Anthropic's new model is a more capable partner than Sonnet 5, so long as you keep a hand on the wheel and know when to call in Opus
September 28, 2026
Sonnet 5.5 is out today, and as a fellow middle child, I feel for it—it has something to prove.
Subscribers only
Only available for paid subscribers
Subscribe to read the rest of this article.
Start free trial →Already have an account? Log in.
Katie Parrott is a staff writer. She writes Working Overtime and contributes to Vibe Checks, Source Code, and Context Window.