--- title: Build an App Where 3 AI Models Race Live | daily.dev description: Ever wonder which AI model is actually the best? In this video, we're building the LLM Arena: a Next.js app that races open-source models side-by-side in... canonical: https://daily.dev/posts/build-an-app-where-3-ai-models-race-live-lgi5rbshn twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Build an App Where 3 AI Models Race Live | daily.dev og:description: Ever wonder which AI model is actually the best? In this video, we're building the LLM Arena: a Next.js app that races open-source models side-by-side in... og:url: https://daily.dev/posts/build-an-app-where-3-ai-models-race-live-lgi5rbshn og:image: https://api.daily.dev/og/posts/LGi5rbSHn.png og:image:alt: Build an App Where 3 AI Models Race Live og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Build an App Where 3 AI Models Race Live **[JavaScript Mastery](https://daily.dev/sources/javascriptmastery)** · 124 min read · 4 upvotes · 0 comments ## Summary Ever wonder which AI model is actually the best? In this video, we're building the LLM Arena: a Next.js app that races open-source models side-by-side in real-time to track exact performance metrics like latency and cost. Vote on the winner to update a public leaderboard. Best of all, we'll build this entire full-stack app completely agentically using Claude Code. Try Greptile for FREE: https://jsm.dev/arena-greptile Try Clerk for FREE: https://jsm.dev/arena-clerk Try Arcjet for FREE: https://jsm.dev/arena-arcjet Try PostHog for FREE: https://jsm.dev/arena-posthog OpenRouter: https://openrouter.ai Prisma: https://www.prisma.io 📋 Join the Agentic Course Waitlist: https://jsm.dev/arena-agentic 🎁 Video Kit (Code, Assets, Prompts): https://jsm.dev/arena-kit ⭐ Get my Pro Courses: https://jsm.dev/arena-jsm ➤ Links not working? Some regions may need a VPN. https://discord.com/invite/n6EdbFJ https://twitter.com/jsmasterypro https://instagram.com/javascriptmastery https://linkedin.com/company/javascriptmastery Business Inquiries: contact@jsmastery.pro Timestamps: 00:00:00 — Introduction 00:05:44 — Scaffold & Tools Setup 00:09:03 — Repository & Code Review 00:15:58 — Foundation & Decision Process 00:45:21 — Coding Standards, Tooling, & Data Model 00:51:49 — Design & Look 01:04:54 — Model Picker 01:09:52 — Send a Prompt, Parallel Streams, and Voting 01:25:01 — Thread History 01:25:53 — Public Thread Visibility & Sharing 01:34:07 — Arcjet: Abuse Protection 01:40:48 — Leaderboard 01:43:06 — PostHog: What Actually Happened 02:03:02 — Wrap-up ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#javascript](https://daily.dev/tags/javascript) [View this post on daily.dev](https://daily.dev/posts/build-an-app-where-3-ai-models-race-live-lgi5rbshn) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Build an App Where 3 AI Models Race Live","url":"https://daily.dev/posts/build-an-app-where-3-ai-models-race-live-lgi5rbshn","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/build-an-app-where-3-ai-models-race-live-lgi5rbshn"},"datePublished":"2026-08-07T13:10:03.338Z","dateModified":"2026-08-07T13:40:07.368Z","description":"Ever wonder which AI model is actually the best? 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