--- title: OpenAI GPT-5.2-Codex (high) vs. Claude Opus 4.5 vs.... description: A hands-on comparison of three leading AI coding models (GPT-5.2-Codex high, Claude Opus 4.5, and Gemini 3 Pro) tested on two real-world coding tasks in an 8K+... canonical: https://daily.dev/posts/1ewv43spn twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: OpenAI GPT-5.2-Codex (high) vs. Claude Opus 4.5 vs. Gemini 3 Pro: Real-World Coding comparison | daily.dev og:description: A hands-on comparison of three leading AI coding models (GPT-5.2-Codex high, Claude Opus 4.5, and Gemini 3 Pro) tested on two real-world coding tasks in an 8K+... og:url: https://daily.dev/posts/1ewv43spn og:image: https://api.daily.dev/og/posts/1eWv43sPn.png og:image:alt: Post cover image 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. # OpenAI GPT-5.2-Codex (high) vs. Claude Opus 4.5 vs. Gemini 3 Pro: Real-World Coding comparison **[Shrijal Acharya](https://daily.dev/sources/jr262d6eor9zowlkswxja)** · [@shricodev](https://daily.dev/shricodev) · 0 upvotes · 0 comments ## Summary A hands-on comparison of three leading AI coding models (GPT-5.2-Codex high, Claude Opus 4.5, and Gemini 3 Pro) tested on two real-world coding tasks in an 8K+ star repository. Claude Opus 4.5 delivered the most consistent and polished results with fastest completion times but highest cost ($0.94-$1.78). GPT-5.2-Codex high produced excellent code quality with strong architecture but required 20-26 minutes per task due to high reasoning mode. Gemini 3 Pro was most efficient and cost-effective with heavy cache utilization but produced more minimal, less polished implementations. Both tasks involved building complex features: a global action palette with keyboard navigation and a usage analytics dashboard with data persistence. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Don’t just attend KubeCon \+ CloudNativeCon, Merge Forward your experience\!](https://daily.dev/posts/don-t-just-attend-kubecon-cloudnativecon-merge-forward-your-experience--l0rpp73x8) · CNCF · 1 upvotes · 0 comments - [Announcing H2 2026 KCDs](https://daily.dev/posts/announcing-h2-2026-kcds-m96goajm1) · CNCF · 1 upvotes · 0 comments - [Two months of Open Community Groups](https://daily.dev/posts/two-months-of-open-community-groups-asf52zhbs) · CNCF · 0 upvotes · 0 comments --- Tags: [#ai-coding](https://daily.dev/tags/ai-coding), [#claude](https://daily.dev/tags/claude), [#google-gemini](https://daily.dev/tags/google-gemini), [#gpt](https://daily.dev/tags/gpt), [#llm](https://daily.dev/tags/llm) [View this post on daily.dev](https://daily.dev/posts/1ewv43spn) ```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":"DiscussionForumPosting","mainEntityOfPage":"https://daily.dev/posts/1ewv43spn","headline":"OpenAI GPT-5.2-Codex (high) vs. Claude Opus 4.5 vs. Gemini 3 Pro: Real-World Coding comparison","text":"Shared: OpenAI GPT-5.2-Codex (high) vs. Claude Opus 4.5 vs. Gemini 3 Pro: Real-World Coding comparison","url":"https://daily.dev/posts/1ewv43spn","datePublished":"2026-01-20T06:33:04.922Z","dateModified":"2026-03-15T07:48:23.252Z","author":{"@type":"Person","name":"Shrijal Acharya","url":"https://daily.dev/shricodev","image":"https://lh3.googleusercontent.com/a/AGNmyxZmnLeXf1imaOxwhgL_d_i8QK8LBHWbY8hwapA2=s96-c","description":"Full Stack SDE • Open-Source Contributor • Collaborator @Oppia 🤝","interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"EndorseAction"},"userInteractionCount":50}},"image":"https://media.daily.dev/image/upload/s--CxzD6vbw--/f_auto/v1722860399/public/Placeholder%2005","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"sharedContent":{"@type":"WebPage","url":"https://api.daily.dev/r/9AXYEV8z2"},"isPartOf":{"@type":"WebPage","url":"https://daily.dev/sources/jr262d6eor9zowlkswxja","name":"Shrijal Acharya"}} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Shrijal Acharya","item":"https://daily.dev/sources/jr262d6eor9zowlkswxja"},{"@type":"ListItem","position":3,"name":"OpenAI GPT-5.2-Codex (high) vs. Claude Opus 4.5 vs. Gemini 3 Pro: Real-World Coding comparison"}]} ```