Jev means structured output is interesting again in seangoedecke.com, curated on eChai

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Curated from seangoedecke.com 16 September 2026
Jev means structured output is interesting again →

Sean Goedecke is a staff engineer at GitHub who writes about how software is built, and this is the most careful engineer's read of the launch. He takes the interface seriously as something new and the moat less so: most of what Jev does, he argues, is available today by prefilling an ordinary model's answer and sampling one token, and he expects other labs and open-weights tinkerers to catch up. The re-creations on this page are the early evidence for that part of it.

Sean Goedecke, in seangoedecke.com

Fast structured output could be a genuinely new computational primitive for intelligence. So far we've built a lot of programs on top of autoregressive token generation, and they all look like fancy chatbots. Leaning hard into structured output might conceivably unlock a bunch of non-chatbot use cases for AI.

[...]

If you want fast, parallelized structured output against limited choices, you don't strictly need to do autoregressive generation at all. You can simply prefill the response with "choice": " and generate one token, restricted to the user-provided choices. [...]

Read it in full on seangoedecke.com →

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Andre Landgraf's showcase of the yes/no gate, several worked examples at the link.

Andre Landgraf 1h

Ok, jev is really cool. So many great use cases where a fast and accurate yes/no gate can deliver meaningful performance gains.

Played around and built some showcase examples here →
safer-with-jev.com Safer with Jev
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Vipul Sharma's Minecraft agents ask Jev whether to fight or run, from what the agent can see, the mob count, its weapon and its health; one broke off mid-fight as the odds turned.

Vipul Sharma 1h

I hooked up Jev by @typesafeai to a few agents on my Minecraft world. Look at how Jev decides when they should fight and when they should run away.

Jev rates the odds from what the agent can see, mob count, weapon, how hurt it is, and runs away when they are bad. One broke off mid-fight as its odds turned.
Curated from X →

Mahmoud's simulation of fifteen autonomous drones through an asteroid field, Jev deciding for each in under 300 ms, all fifteen arriving.

Mahmoud 2h

Jev can control a swarm of 15 autonomous drones in real time!

I built a simulation to test it navigating an asteroid field:

• Decision latency: < 300ms
• Survival rate: 100% (all 15 reached the destination)

Built with @typesafeai by @CompleteSkeptic

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