Banja Lab / Benchmarks / Test
UI-0004UI components · medium
Signup form with inline email validation
The same task, run on 28 models. Compare the outputs side by side, or open any one in a popup to inspect it.
Top result: claude-opus-4-8 (low reasoning) at 100.0% composite. Lowest: grok-build-0.1 at 60.8%. 28 models compared on this task.
How it ran
- Each model was given the brief below in a fresh, isolated session with no access to our tools, and returned a single self-contained index.html (inline CSS and JS, no external requests, no build step).
- The rendered output was scored 1 to 5 on brief fidelity, visual design, craft, and impact by a four-family vision panel - Anthropic (Claude Opus 4.8), OpenAI (GPT-5.5), Google (Gemini 3.1 Pro), and xAI (Grok 4.3) - using one identical prompt so the scores compare. The published judge score is leave-one-family-out: a model is never scored by a judge of its own family, so same-family self-preference is removed.
The brief
Build a self-contained signup form as a single HTML file (`index.html`) that renders with no build step and no network calls (inline all CSS and JS). Requirements: - an email input and a submit button inside a form, - inline client-side validation that runs on submit and does not reload the page: submitting with an empty or invalid email reveals a visible error message (use role="alert" for the error), and the input is marked aria-invalid="true", - submitting a valid email reveals a visible success message (use role="status") and clears the error. Do not rely on the browser's native required-field popup; show your own inline message element. Use plain, readable, accessible markup. No external fonts or scripts.
