News & updates
Ongoing, dated tracking of Jev and the wider System One space. We add an entry whenever there is something concrete to report — releases, notable third-party results, ecosystem moves.
Timeline
Ecosystem explosion: 1,500+ stars in a month
SemIf, pg-jev, jev-review, typesafe-mario, foreman and more appear in quick succession; open-source replicas follow (mini-jev, Qwen-2.5-1B-RLCD).
Third-party test: calibration "actually usable"
lindfors.no ran 24 Norwegian hearing letters through Jev: 0.31 s, ~$0.0002 per call. Key finding: the questions it got wrong were exactly the ones with the lowest reported confidence — the uncertainty signal is trustworthy.
1,886 points on HN; Doom demo goes viral
"Introducing System One Models and Jev" tops Hacker News. The real-time Doom demo sparks debate, including critiques of the latency comparison's framing. Official response: coding scenarios (state engineering) not yet started.
TypeSafe launches Jev and the "System One" category
jev-1.13.0 ships at $42/Btok with free output, alongside docs, Python/JS SDKs, four Patterns, and a Playground.
What we're watching
- State engineering for code — the CEO admitted coding scenarios aren't started yet; first-party tooling here would be the biggest unlock.
- CJK accuracy — any movement on non-English precision directly affects the large developer market this site serves.
- Open replicas — if a small open model matches calibration on common tasks, the proprietary moat narrows quickly.
- Rate-limit & pricing stability — both are officially "in flux"; changes here move the cost math in our costing page.