To Nha Notes | July 6, 2026, 11:48 p.m.
For builders, Claire recommends GPT-5.5 for PRDs, Sonnet 4.6 for prototypes and chitchat, and Opus 4.8 or Sonnet 5 for codebase navigation. Those are the task-by-task recommendations that came out of the Claire-weighted index. Complex, dense UI work is where Opus 4.8 still earns its price premium; for everything simpler, Sonnet 4.6 holds up.
The Verdict on UI Development: Opus 4.8 vs. Sonnet 4.6
One of the most valuable insights from the index centers around front-end engineering. Where should you spend your budget?
Choose Opus 4.8 for: Complex, dense UI work. When you are dealing with intricate state management, messy frontend architectures, or high-fidelity UI components, Opus 4.8 easily earns its price premium.
Choose Sonnet 4.6 for: Everything simpler. If your UI tasks are straightforward or standard, Sonnet 4.6 holds up incredibly well without the steep costs.