--- title: Grok 4.6 vs Claude Code vs Codex - Fullstack App Contest... description: A YouTuber runs a blind, non-scientific comparison having Grok 4.6, Claude Code, and Codex (GPT-5.6 Sora) each build the same full-stack AI jobs board app... canonical: https://daily.dev/posts/grok-4-6-vs-claude-code-vs-codex---fullstack-app-contest-to-see-the-best-one-yndlcithj twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Grok 4.6 vs Claude Code vs Codex - Fullstack App Contest To See The Best One | daily.dev og:description: A YouTuber runs a blind, non-scientific comparison having Grok 4.6, Claude Code, and Codex (GPT-5.6 Sora) each build the same full-stack AI jobs board app... og:url: https://daily.dev/posts/grok-4-6-vs-claude-code-vs-codex---fullstack-app-contest-to-see-the-best-one-yndlcithj og:image: https://api.daily.dev/og/posts/YNdlCITHJ.png og:image:alt: Grok 4.6 vs Claude Code vs Codex - Fullstack App Contest To See The Best One 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. # Grok 4.6 vs Claude Code vs Codex - Fullstack App Contest To See The Best One **[ByteGrad](https://daily.dev/sources/bytegrad)** · 29 min read · 0 upvotes · 0 comments ## Summary A YouTuber runs a blind, non-scientific comparison having Grok 4.6, Claude Code, and Codex (GPT-5.6 Sora) each build the same full-stack AI jobs board app (Next.js + Supabase) from an identical prompt. Each agent had the same Supabase and Context7 MCP skills available and an hour time limit, though all finished in 14-21 minutes. The apps are inspected blind for design and functionality (pagination, filtering, CRUD admin panels, image generation, form validation bugs), then revealed: app one was Claude Code, app two was Codex (GPT-5.6 Sora), app three was Grok. The presenter judged Codex's design the best, functionality roughly a draw across all three, and said they'd personally continue building with Grok over Claude Code due to small UX touches like a reset button and featured-post placement. Codex could generate PNG images and had a built-in search feature; Claude Code only produced SVGs; Grok generated JPEGs. Cost comparison was inconclusive due to inability to isolate Codex's token cost, though Grok was estimated cheaper than Claude Code. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How does Grok 4.6 compare to Claude Code and Codex (GPT-5.6) for building a fullstack app? Grok 4.6 competes closely with Claude Code and Codex when building the same Next.js and Supabase full-stack jobs board app from an identical prompt. Codex produced the most polished design and could generate PNG images plus had a search feature; Grok came a close second in design and generated JPEG images; Claude Code only produced SVG placeholders. All three had similar functional bugs around form resets and featured-post ordering. _Compare AI coding agent tradeoffs like this before betting a real project on one, using coverage on daily.dev._ ### How long did it take Grok, Codex, and Claude Code to build the same fullstack app? Grok finished in about 14 minutes, Codex in about 15 minutes, and Claude Code in about 21 minutes, all working from the same one-hour time limit and prompt to build a Next.js and Supabase jobs board application. Cost could only be reasonably estimated for Grok and Claude Code, with Grok appearing cheaper, though Codex's cost couldn't be fairly isolated. _Track build-speed and cost differences across agents on daily.dev before picking one for a real project._ ### What common bugs did AI coding agents make when building a jobs board app with featured listings? All three agents (Grok, Claude Code, and Codex) mishandled featured job post prioritization, sorting listings by newest rather than surfacing featured posts consistently at the top, and one agent only displayed three featured posts regardless of how many existed. Form validation issues also appeared across agents, including forms resetting on error and unclear success feedback after submission. _Watch for these recurring agent-generated UX bugs when reviewing AI-built features on daily.dev._ ## Similar posts on daily.dev - [I gave Claude Opus 5, GPT-5.6, and Grok 4.6 the same complex web project and only one behaved like a senior developer](https://daily.dev/posts/i-gave-claude-opus-5-gpt-5-6-and-grok-4-6-the-same-complex-web-project-and-only-one-behaved-like-a-jilkwew81) · XDA Developers · 0 upvotes · 0 comments - [What's the Best Coding Agent? 2026 Edition](https://daily.dev/posts/what-s-the-best-coding-agent-2026-edition-trb7fsjcm) · DoltHub Blog · 0 upvotes · 0 comments - [I asked Claude Opus 5, GPT-5.6, and Grok 4.6 to copy the same polished UI — tiny details exposed the winner](https://daily.dev/posts/i-asked-claude-opus-5-gpt-5-6-and-grok-4-6-to-copy-the-same-polished-ui-tiny-details-exposed-the-nni4cnxej) · XDA Developers · 0 upvotes · 0 comments --- Tags: [#nextjs](https://daily.dev/tags/nextjs), [#claude-code](https://daily.dev/tags/claude-code), [#supabase](https://daily.dev/tags/supabase), [#grok](https://daily.dev/tags/grok), [#openai-codex](https://daily.dev/tags/openai-codex) [View this post on daily.dev](https://daily.dev/posts/grok-4-6-vs-claude-code-vs-codex---fullstack-app-contest-to-see-the-best-one-yndlcithj) ```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":"Grok 4.6 vs Claude Code vs Codex - Fullstack App Contest To See The Best One","url":"https://daily.dev/posts/grok-4-6-vs-claude-code-vs-codex---fullstack-app-contest-to-see-the-best-one-yndlcithj","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/grok-4-6-vs-claude-code-vs-codex---fullstack-app-contest-to-see-the-best-one-yndlcithj"},"datePublished":"2026-08-17T16:52:02.994Z","dateModified":"2026-09-13T20:34:23.150Z","description":"A YouTuber runs a blind, non-scientific comparison having Grok 4.6, Claude Code, and Codex (GPT-5.6 Sora) each build the same full-stack AI jobs board app...","image":"https://i.ytimg.com/vi/Q-qUm7QPs2s/sddefault.jpg","thumbnailUrl":"https://i.ytimg.com/vi/Q-qUm7QPs2s/sddefault.jpg","isAccessibleForFree":true,"articleSection":"ByteGrad","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"ByteGrad","logo":"https://media.daily.dev/image/upload/s--UnJ6vKLR--/f_auto/v1732552127/logos/bytegrad","url":"https://daily.dev/sources/bytegrad"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/grok-4-6-vs-claude-code-vs-codex---fullstack-app-contest-to-see-the-best-one-yndlcithj","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"nextjs,claude-code,supabase,grok,openai-codex","timeRequired":"PT29M","video":{"@type":"VideoObject","name":"Grok 4.6 vs Claude Code vs Codex - Fullstack App Contest To See The Best One","description":"A YouTuber runs a blind, non-scientific comparison having Grok 4.6, Claude Code, and Codex (GPT-5.6 Sora) each build the same full-stack AI jobs board app...","thumbnailUrl":"https://i.ytimg.com/vi/Q-qUm7QPs2s/sddefault.jpg","uploadDate":"2026-08-17T16:52:02.994Z","duration":"PT29M","url":"https://api.daily.dev/r/YNdlCITHJ","embedUrl":"https://www.youtube.com/embed/Q-qUm7QPs2s"}} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"ByteGrad","item":"https://daily.dev/sources/bytegrad"},{"@type":"ListItem","position":3,"name":"Grok 4.6 vs Claude Code vs Codex - Fullstack App Contest To See The Best One"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/grok-4-6-vs-claude-code-vs-codex---fullstack-app-contest-to-see-the-best-one-yndlcithj#faq","mainEntity":[{"@type":"Question","name":"How does Grok 4.6 compare to Claude Code and Codex (GPT-5.6) for building a fullstack app?","acceptedAnswer":{"@type":"Answer","text":"Grok 4.6 competes closely with Claude Code and Codex when building the same Next.js and Supabase full-stack jobs board app from an identical prompt. Codex produced the most polished design and could generate PNG images plus had a search feature; Grok came a close second in design and generated JPEG images; Claude Code only produced SVG placeholders. All three had similar functional bugs around form resets and featured-post ordering. Compare AI coding agent tradeoffs like this before betting a real project on one, using coverage on daily.dev."}},{"@type":"Question","name":"How long did it take Grok, Codex, and Claude Code to build the same fullstack app?","acceptedAnswer":{"@type":"Answer","text":"Grok finished in about 14 minutes, Codex in about 15 minutes, and Claude Code in about 21 minutes, all working from the same one-hour time limit and prompt to build a Next.js and Supabase jobs board application. Cost could only be reasonably estimated for Grok and Claude Code, with Grok appearing cheaper, though Codex's cost couldn't be fairly isolated. Track build-speed and cost differences across agents on daily.dev before picking one for a real project."}},{"@type":"Question","name":"What common bugs did AI coding agents make when building a jobs board app with featured listings?","acceptedAnswer":{"@type":"Answer","text":"All three agents (Grok, Claude Code, and Codex) mishandled featured job post prioritization, sorting listings by newest rather than surfacing featured posts consistently at the top, and one agent only displayed three featured posts regardless of how many existed. Form validation issues also appeared across agents, including forms resetting on error and unclear success feedback after submission. Watch for these recurring agent-generated UX bugs when reviewing AI-built features on daily.dev."}}]} ```