TypeSafe AI: we are officially out of stealth (X)

Introducing System One Models and Jev (Hacker News launch thread)

The 1,978-point, 513-comment launch thread. The top comment calls the speed comparison misleading, since Jev only returns structured output, and disputes the cannot-hallucinate claim because a valid type can still hold a wrong value. Others note ordinary LLMs can already be forced into structured output.

Diogo Almeida's Jev launch post (X)

The founder's launch post, around 76k likes, arguing that RLCD-trained decision models are a shorter path to economic value than chat models. Submitted separately to HN as item 49716682.

Diogo Almeida (@CompleteSkeptic)OpenDiogo Almeida's Jev launch post (X) on x.com

39M viewsSpeed 20-200x fasterCost 40-400x cheaper

Instant generative UI (X)

A video demo pairs json-render with Jev to render generative UI components in milliseconds, using the viewer's own components, actions, and design system.

Chris Tate (@ctatedev)1.3M viewsOpenInstant generative UI (X) on x.com

Copy and paste made smart with Jev (X)

A video demo of copy and paste made 'smart' using Jev from TypeSafe, with no further detail on the mechanism given in the post text.

Marcus Lowe (@marcus_lowe)1.1M viewsOpenCopy and paste made smart with Jev (X) on x.com

Breaking down 724 ads from 37 brands with Jev (X)

A demo breaking down 724 live ads from 37 brands in 40 seconds for 9 cents, covering hook, format, offer, CTA, funnel stage and landing-page mismatch for each ad.

Matthew Berman (@TheMattBerman)OpenBreaking down 724 ads from 37 brands with Jev (X) on x.com

1.1M viewsSpeed 724 ads/40sCost 9 cents

An internal-link SEO audit (X)

A video demo has Jev read 586 pages of a site in 45.1 seconds and rebuild the internal link map, placing 584 links and refusing 139 pages where nothing fit, for $0.21 total. In the same time, Claude Opus 5 processed only 21 of the same pages for $1.43.

borja (@borjafat)OpenAn internal-link SEO audit (X) on x.com

827k viewsPages read 586 in 45.1sCost $0.21