{"rewrite":{"id":"r_241d7e0f0e5d407ab3f4fbeb","clusterId":"c_fbbfe864b1f2488f9286074e","slug":"codex-builds-a-playable-shooter-in-minutes-where-claude-took-hours","model":"deepseek-v4-pro","headline":"Codex Builds a Playable Shooter in Minutes Where Claude Took Hours","summary":"Shinkiyo tested OpenAI's Codex coding environment by having it recreate a 2D shooter previously built with Claude Code. The first version of \"Starfall Armada\" ran in 3 minutes and 22 seconds, and a playable game with a space background and adjusted difficulty was finished in about 30 minutes. The same task took over five hours with Claude Code a year ago.","whyItMatters":"The jump from five hours to 30 minutes for a working game prototype shows Codex is compressing the iteration cycle for solo developers.","webCardHtml":"\u003cp\u003eCodex called GPT Image 2.0 on its own to generate a space background when Shinkiyo asked for one, a step that required no separate tool or manual integration. The Pro plan at 16,800 yen per month was necessary for the workload; the cheaper Plus plan ran into token limits that made sustained programming work impractical. The completed game, \"Starfall Armada,\" mixes Space Invaders and Galaxian mechanics with enemy variations, a combo system, bombs, and a boss on stage five. A playable version is hosted on Vercel.\u003c/p\u003e","blueskyPost":"Shinkiyo had Codex recreate a 2D shooter that took over 5 hours with Claude Code a year ago. First version ran in 3 minutes 22 seconds. A playable game with background art and balanced difficulty was done in about 30 minutes. The Pro plan cost 16,800 yen per month.","twitterPost":"Shinkiyo had Codex recreate a 2D shooter that took over 5 hours with Claude Code a year ago. First version ran in 3 minutes 22 seconds. A playable game with background art and balanced difficulty was done in about 30 minutes. The Pro plan cost 16,800 yen per month.","threadsPost":null,"newsletterBlurb":"Shinkiyo put OpenAI's Codex to a direct comparison test by having it build the same 2D shooter previously made with Claude Code. The first version of \"Starfall Armada\" was running in under four minutes, and a complete playable build with art and tuned difficulty took roughly 30 minutes. A year ago, the Claude Code version required over five hours. Codex also called GPT Image 2.0 on its own to generate a space background, and the Pro plan was needed to avoid token limits that hamper the cheaper Plus tier.","attributionJson":"[{\"source\":\"ASCII.jp\",\"url\":\"https://ascii.jp/elem/000/004/402/4402693/?rss\",\"title\":\"Can AI Alone Make Games? The Capabilities and Limits Seen After Having Codex Create Six Games (1/5)\"}]","lintFlagsJson":"[]","lintHits":0,"costUsd":0,"inputTokens":3193,"outputTokens":619,"status":"published","repairAttempts":0,"nextRepairAt":null,"factsAttemptedAt":1779826629,"createdAt":"2026-05-20T00:36:29.000Z","publishedAt":"2026-05-20T01:01:01.000Z","updatedAt":"2026-05-20T01:01:01.000Z"},"cluster":{"id":"c_fbbfe864b1f2488f9286074e","canonicalTitle":"AIだけでゲームは作れるのか？ Codexに6本作らせて見えた実力と限界  (1/5)","representativeArticleId":"a_503e1fc349e2badec135ac00","sourceCount":1,"writtenSourceCount":1,"writeAttempts":0,"isSolo":true,"entitiesJson":"{\"anime_titles\":[],\"manga_titles\":[],\"studios\":[],\"people\":[],\"type\":\"news\",\"domain\":\"games\",\"is_roundup\":false}","contentType":"news","status":"published","firstSeenAt":"2026-05-17T22:00:00.000Z","lastSeenAt":"2026-05-17T22:00:00.000Z","updatedAt":"2026-05-20T01:01:57.000Z"},"attribution":[{"source":"ASCII.jp","url":"https://ascii.jp/elem/000/004/402/4402693/?rss","title":"AIだけでゲームは作れるのか？ Codexに6本作らせて見えた実力と限界  (1/5)"}],"entities":{"anime_titles":[],"manga_titles":[],"studios":[],"people":[],"type":"news","domain":"games","is_roundup":false},"keyFacts":["OpenAI's Codex coding environment built a playable 2D shooter in 3 minutes and 22 seconds, with a finished version completed in about 30 minutes.","The same task took over five hours with Anthropic's Claude Code a year ago.","Codex autonomously called GPT Image 2.0 to generate a space background when the user requested one, requiring no separate tool or manual integration.","The Pro plan at 16,800 yen per month was required for the workload; the cheaper Plus plan hit token limits that made sustained programming impractical.","The completed game, 'Starfall Armada,' mixes Space Invaders and Galaxian mechanics with enemy variations, a combo system, bombs, and a boss on stage five."]}