Banja Lab / Benchmarks / Test
RESPO-0004Websites · hard
Responsive nav that both collapses at the breakpoint and toggles open on mobile
The same task, run on 27 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: claude-haiku-4-5 at 0.0%. 27 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 single self-contained HTML file (`index.html`) that renders with no build step and no network calls (inline all CSS and JS; no external fonts, scripts, or images). Build a header containing a brand label, a menu list with id="menu" holding at least four links, and a menu (hamburger) button with id="menu-btn". Make it responsive about a breakpoint near 860px wide and make the mobile menu actually work: - on a desktop (around 1440px wide) show the links as an inline row (id="menu" visible) and keep the "menu-btn" hidden (display:none), - on a phone and tablet (around 360px and 768px wide) hide the inline list by default and show the "menu-btn" instead, and - on a phone, clicking "menu-btn" must open the collapsed menu so the links become visible (toggle an "open" state), and keep the button's aria-expanded in sync. The two navigation controls must never both be visible at the same width, and the page must not scroll horizontally at any of 360px, 768px, or 1440px wide. Include a <main> with an <h1> and a paragraph. Use plain, accessible markup.
