v0 adds Claude Opus 5 for UI generation
By Steven Van ·
Opus 5 roughly doubled Opus 4.8's Frontier-Bench score at half the price, and v0 turned it on the same day.
v0 turned on Claude Opus 5 on launch day, with a link to try it directly (v0.app/?opus5). For a tool whose job is turning prompts into working UI and apps, a stronger coding model is the most direct upgrade there is, and Opus 5 is a notable step up.
What Opus 5 brings to UI generation
v0 lives and dies on how well its model translates intent into clean, working components and screens. Opus 5 is Anthropic's new flagship, built for frontier-class agentic coding, and it roughly doubled Opus 4.8's score on Frontier-Bench (43.3% vs 18.7%), the benchmark that maps to real multi-file, multi-step engineering rather than one-shot snippets. That's exactly the kind of work v0 does when it builds out a full interface: many files, wired together, that have to actually run.
Frontier quality at half the cost
Opus 5's headline is roughly Claude Fable 5-level intelligence at half the price ($5/$25 per million tokens). For iterative UI work, where you generate, look, tweak, and regenerate many times, price-per-attempt matters a lot: cheaper frontier output means more design iterations for the same spend. Opus 5's low/medium/high effort toggle helps here too, dial effort up for a complex screen, down for a quick component tweak.
A fast-moving model landscape inside v0
v0 keeps its model roster current (Nano Banana 2 Lite landed recently for images), and adding Opus 5 the day it shipped keeps its code generation on the frontier. The practical effect for anyone building in v0: the generated result should need fewer fixes before it's usable, and complex, multi-component requests should hold together better.
Try it
Select Claude Opus 5 in v0 (or jump straight in at v0.app/?opus5). Give it a genuinely multi-part UI, a dashboard, a multi-step form, a layout with real interactivity, and judge how much of it works on the first generation.