Opus handles big-picture reasoning, Jev makes small yes/no calls in an agent setup
Someone wired Jev into a real agent: Opus does the heavy reasoning, Jev answers each small yes/no call within 100 milliseconds and picks the recovery path when a tool call fails, reportedly cutting cost and time by 80%.
If you're still confused about what Jev actually does, read this. Everyone's been posting Jev demos but nobody's showing you how to actually wire it into something real. This guy just built the thing AND posted the code. Opus handles the heavy thinking, Jev makes every small yes or no call the harness throws at it. He says it cut his costs and time by 80%. 80 PERCENT. Honestly the bit that got me is the recovery part. Every agent I run dies the second a tool call fails, and I've been fixing that by hand for months. He just lets Jev pick the recovery path in 100 milliseconds and keeps moving. Read it twice. It's that good.
This post quotes another post: “A complete guide to getting started building with Jev”