{"slug": "jev-8-real-use-cases-for-the-fastest-cheapest-model-ive-ever-used-john-lindquist", "title": "Jev: 8 real use cases for the fastest, cheapest model I’ve ever used | John Lindquist", "summary": "John Lindquist, creator of egghead.io and founder of mega.dev, demonstrated 8 real use cases for Jev, the TypeSafe AI decision model he calls the fastest and cheapest model he has used, on the How I AI podcast. The demos include a real-time voice to-do app, millisecond data deduplication with confidence scores, plain-English-to-function routing, a multi-level app router, a chess match against a low-reasoning LLM with speed and cost benchmarks, a Wikipedia \"path to philosophy\" route mapper, multi-agent coordination with collision avoidance, and a real-time presentation coach. Lindquist also covered where Jev falls short and when developers should still reach for a full generative model.", "body_md": "**John Lindquist** created egghead.io, a developer education platform used by hundreds of thousands of working engineers. These days he’s building mega.dev, a hands-on program specifically for developers who want to do real work with AI agents, not just prototype them.\n\n**Listen or watch on [YouTube](https://youtu.be/dAIIaepNhQM), [Spotify](https://open.spotify.com/episode/7y3ZneX90vWwdfBOdFXGwv), or [Apple Podcasts](https://podcasts.apple.com/us/podcast/jev-8-real-use-cases-for-the-fastest-cheapest-model/id1809663079?i=1000792403834)**\n\n### What you’ll learn:\n\n1. Why Jev is a decision engine, not a chatbot, and what that distinction actually changes about how you build\n2. How John built a real-time voice to-do app that classifies and executes commands with no visible pause\n3. The data deduplication pattern that merges messy records in milliseconds using confidence scores\n4. Why Jev works best as a router, and how a single text input can navigate users deep into an app\n5. What a chess match between Jev and a low-reasoning LLM reveals about speed, cost, and when to use which\n6. The multi-step classification pattern John reaches for when one Jev pass isn’t enough\n7. Where Jev falls short, and when you should still reach for a full generative model\n\n### Brought to you by:\n\n[Vanta](https://www.vanta.com/howiai)—Automate compliance and simplify security\n\n### In this episode, we cover:\n\n([00:00](https://www.youtube.com/watch?v=dAIIaepNhQM)) John Lindquist returns for Jev week\n\n([04:32](https://www.youtube.com/watch?v=dAIIaepNhQM&t=272s)) What Jev actually outputs\n\n([06:15](https://www.youtube.com/watch?v=dAIIaepNhQM&t=375s)) Demo: real-time voice to-do app\n\n([08:17](https://www.youtube.com/watch?v=dAIIaepNhQM&t=497s)) How sequential Jev calls chain together\n\n([10:38](https://www.youtube.com/watch?v=dAIIaepNhQM&t=638s)) Demo: plain English to function name (grocery cart)\n\n([11:50](https://www.youtube.com/watch?v=dAIIaepNhQM&t=710s)) Demo: data deduplication and record merging\n\n([13:45](https://www.youtube.com/watch?v=dAIIaepNhQM&t=825s)) Confidence scores and multi-model validation\n\n([15:06](https://www.youtube.com/watch?v=dAIIaepNhQM&t=906s)) Demo: Jev as a multi-level app router\n\n([18:23](https://www.youtube.com/watch?v=dAIIaepNhQM&t=1103s)) Architecting around Jev\n\n([19:35](https://www.youtube.com/watch?v=dAIIaepNhQM&t=1175s)) Demo: Jev vs. traditional LLM at chess (speed and cost benchmarks)\n\n([24:29](https://www.youtube.com/watch?v=dAIIaepNhQM&t=1469s)) DOM interactions as a decision set, not an infinite canvas\n\n([28:21](https://www.youtube.com/watch?v=dAIIaepNhQM&t=1701s&pp=0gcJCWMAwfN6Pr3D)) Demo: Wikipedia “path to philosophy” route mapper\n\n([30:28](https://www.youtube.com/watch?v=dAIIaepNhQM&t=1828s)) Demo: multi-agent coordination and collision avoidance\n\n([33:36](https://www.youtube.com/watch?v=dAIIaepNhQM&t=2016s&pp=0gcJCWMAwfN6Pr3D)) Demo: real-time presentation coach\n\n([36:56](https://www.youtube.com/watch?v=dAIIaepNhQM&t=2216s)) Quick recap\n\n([39:54](https://www.youtube.com/watch?v=dAIIaepNhQM&t=2394s)) Lightning round and final thoughts\n\n### Tools referenced:\n\n• Jev (TypeSafe AI decision model): [https://typesafe.ai/blog/introducing-system-one-models-and-jev](https://typesafe.ai/blog/introducing-system-one-models-and-jev)\n\n• Vercel AI Gateway: [https://vercel.com/docs/ai-gateway](https://vercel.com/docs/ai-gateway)\n\n• OpenRouter: [https://openrouter.ai](https://openrouter.ai)\n\n• Opus 5.5 (mentioned in context of iterative demo building): [https://www.anthropic.com/claude-opus-5-5](https://www.anthropic.com/claude-opus-5-5)\n\n### Where to find John Lindquist:\n\nLinkedIn: [linkedin.com/in/john-lindquist-84230766](http://linkedin.com/in/john-lindquist-84230766)\n\nX: [https://x.com/johnlindquist](https://x.com/johnlindquist)\n\nMega.dev: [https://mega.dev/](https://mega.dev/)\n\nEgghead.io: [https://egghead.io/](https://egghead.io/)\n\n### Where to find Claire Vo:\n\nChatPRD: [https://www.chatprd.ai/](https://www.chatprd.ai/)\n\nWebsite: [https://clairevo.com/](https://clairevo.com/)\n\nLinkedIn: [https://www.linkedin.com/in/clairevo/](https://www.linkedin.com/in/clairevo/)\n\nProduction and marketing by [https://penname.co/](https://penname.co/). For inquiries about sponsoring the podcast, email [\\[email protected\\]](https://www.lennysnewsletter.com/cdn-cgi/l/email-protection).", "url": "https://wpnews.pro/news/jev-8-real-use-cases-for-the-fastest-cheapest-model-ive-ever-used-john-lindquist", "canonical_source": "https://www.lennysnewsletter.com/p/jev-8-real-use-cases-for-the-fastest", "published_at": "2026-09-30 12:04:27+00:00", "updated_at": "2026-10-15 05:42:47.080630+00:00", "lang": "en", "topics": ["artificial-intelligence", "ai-agents", "ai-tools", "ai-products", "large-language-models"], "entities": ["John Lindquist", "Jev", "TypeSafe AI", "egghead.io", "mega.dev", "How I AI", "Vercel AI Gateway", "OpenRouter"], "also_reported_by": [], "alternates": {"html": "https://wpnews.pro/news/jev-8-real-use-cases-for-the-fastest-cheapest-model-ive-ever-used-john-lindquist", "markdown": "https://wpnews.pro/news/jev-8-real-use-cases-for-the-fastest-cheapest-model-ive-ever-used-john-lindquist.md", "text": "https://wpnews.pro/news/jev-8-real-use-cases-for-the-fastest-cheapest-model-ive-ever-used-john-lindquist.txt", "jsonld": "https://wpnews.pro/news/jev-8-real-use-cases-for-the-fastest-cheapest-model-ive-ever-used-john-lindquist.jsonld"}}