Jev Daily

Mike Taylor: Jev-as-a-judge favors whatever comes first

Mike Taylor warns that Jev used as a judge is strongly biased to position, often picking the first option it is shown. If your eval compares two candidates in a fixed order, that bias is in your numbers.

Writing criteria

Berman ranks nine agents to build, Jev shows up at number five

Matthew Berman posted the order he would build nine agents in if he had to make money with them starting Monday, with speed-to-lead first and the weekly report last. Jev appears at number five, the competitor ad breakdown, where he says it broke down 724 live ads from 37 brands in 40 seconds for 9 cents.

Matthew Berman
@TheMattBerman
X
pick the channel already making you money. build one agent for its most boring hour.
Oct 30, 2026 · View on X

Read the full story

Mike Taylor pairs Claude with Jev to do napkin math

Mike Taylor ran Fermi problems (estimate an unknown by splitting it into parts) through Claude plus Jev, with Claude breaking down the question and Jev estimating the probability on each piece.

Mike Taylor
@hammer_mt
X
claude breaks down the questions and jev estimates the probability
Oct 30, 2026 · View on X

Read the full story

The case against

Mike Taylor says Jev-as-a-judge is strongly biased to position

Mike Taylor posted a warning about using Jev as a judge, saying it is strongly biased to position and often picks whatever option comes first. He did not publish the setup or a hit rate in the post, so this is one person's finding, not a measured rate you can plan around.

Mike Taylor
@hammer_mt
X
it is strongly biased to position (it often picks what comes first)
Oct 30, 2026 · View on X

Read the full story

Get the next one by email

Jev, read daily so you do not have to. The builds, the benchmarks, the criteria that worked and the cases where it lost, from the people shipping on TypeSafe AI's System One model.