Prompt: landing page on Kimi K3.1 Pro (test against Claude)

⚙️ How to use this prompt

1. Open Kimi and pick the K3.1 Pro model
2. Paste the prompt below into a new chat
3. Copy the code from the answer, save it in a file called index.html and open it in your browser

If the chat says it is full, you can use the Kimi API, which charges per use. That is how I ran the test.

⬇️ Prompt ⬇️

Create a single-page landing page, in HTML, CSS and JavaScript in one file, for a Brazilian specialty coffee brand called "Serra Alta". I want an opening section with a 3D coffee bag made in CSS that spins as the person scrolls the page, three product sections with prices in reais, testimonials and a footer. Modern look, warm colors, smooth animations on scroll. Deliver the complete code.

🔍 The test result

I ran the same prompt on both models on 11/03/2026: on Kimi K3.1 Pro through the API, and on Claude Opus 5.5 inside Claude Code. Neither got a follow-up request for changes. Both pages are here, exactly as they came out:

• Open the Kimi K3.1 Pro page
• Open the Claude Opus 5.5 page

I liked the Kimi one better. The price was a surprise, in the other direction:

	Kimi K3.1 Pro	Claude Opus 5.5
Price per million tokens (input / output)	US$ 2 / US$ 10	US$ 4 / US$ 20
Tokens it wrote	26,816 (9,158 just thinking)	about 4,400
Cost of this page	US$ 0.27	about US$ 0.09

A Kimi token costs half as much, but it wrote six times more, and this page came out more expensive. The Kimi cost comes from the API bill; the Claude one is estimated from the size of the page, because I did not run it through the API.

🔗 Links from the video

• Official Kimi K3.1 Pro launch post, from 10/23/2026. Moonshot promised to release the full model for download on 11/4/2026.
• Launch video
• Kimi K3.1 Pro tech blog, with the coding test (Terminal-Bench 4.0): Kimi K3.1 Pro at 65.7, GPT-6 Astra at 58.2 and Claude Opus 5.5 at 66.4, according to Moonshot itself.
• Code Arena website ranking, voted by people: Kimi K3.1 Pro was 9th in the 10/27/2026 update.
• Kimi API prices and Claude API prices
• Claude plans: Max costs US$ 100 a month in the US and R$ 550 in Brazil.