Lenny's Newsletter · Claire Vo
podcastplaybookJev for beginners: how to use it and what to build
28 September 2026Product
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About Lenny's NewsletterWatch now (26 mins) | 🎙️ Jev returns type-safe structured values instead of text, which makes it the fastest, cheapest classification layer I’ve ever put in a pipeline—and this week I shipped three real projects with it
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Apollo layer
What a founder can learn
Founder takeaway
When an AI workflow only needs classification, use type-safe structured outputs instead of generating and parsing prose. This can simplify the pipeline and may reduce both latency and cost.
Why it matters
Founders often overbuild AI features around free-form text. Constraining outputs to the exact values the product needs can make prototypes easier to ship, integrate, and operate reliably.
Relevant guides
Put it to work
Pick one classification step in your product and compare structured output with your current approach on accuracy, latency, cost, and implementation complexity.
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