Jev glossary
Core ConceptsTypeSafe
TypeSafe AI
The company behind Jev and the System One API, including the official SDKs, cookbooks, console, and published workflow evals.
- Category
- Core Concepts
- Also known as
- TypeSafe
- Reading time
- 1 min
- Related terms
- 5
- Directory entries
- 4
- Docs
- typesafe.ai
- Added
- 2026-09-24
Definition
TypeSafe AI builds decision models for machine-to-machine software. Its training path is RLCD (reinforcement learning for calibrated decisions), and its cofounder Diogo Almeida co-invented RLHF. Jev is its first public System One model.
The company raised a $40 million seed round led by DCVC, went out of stealth in September 2026, and runs the docs, console, Discord, and evals.typesafe.ai, where it publishes workflow evaluations of Jev against frontier LLMs.
Tagscompanycore
Related terms
Definitions that connect to this one.
JevTypeSafe AI's flagship AI model and the first System One model: typed decisions and calibrated probabilities instead of generated text.Core ConceptsSystem OneThe class of AI models built to make fast, structured decisions software can use directly, named after Kahneman's fast-thinking System 1.Core ConceptsRLCDTypeSafe's post-training method: reinforcement learning that optimizes for calibrated decisions and probabilities instead of generated text.Evaluation & TrainingWorkflow evalsTypeSafe's published evaluations of four automation workflows, comparing Jev and frontier LLMs as structured workflows versus single prompts.Evaluation & TrainingClient SDKThe official typed clients for the API (Python and JavaScript/TypeScript), with retries and inferred answer types.API & Models
From the Jev directory
Directory entries that go deeper on this term.
TypeSafe AI's product site for Jev, its first System One Model: typed decisions with calibrated confidence, performance and pricing claims, a FAQ, and links to the docs, console, workflow evals, and launch post.
Jev Guides & ArticlesDocs#official#docs#models
Official
Official LinkedIn page for TypeSafe AI with company details, launch announcements, and hiring posts, including the $40 million seed round led by DCVC.
Jev Guides & ArticlesPost#official#post#community
Official
Official TypeSafe community Discord for support and discussion, including a Show and Tell channel where builders share demos built with Jev.
Jev Guides & ArticlesDocs#official#community#demos
Official
TypeSafe AI's official launch post: the company is out of stealth and developers can get access to Jev from the website, alongside the founder's launch thread.
Jev Guides & ArticlesPost#official#x#launch
Official
From the Jev AI model community
Posts from builders shipping with Jev right now.