Guide
How to use Jev: a beginner's guide to typed AI decisions
Seven steps from your first question to a decision you can trust, with examples you can run in the browser.
GUIDES / 9
Jev guides: learn how to use Jev, step by step
Start with the basics, then go as deep as you need: the Jev AI API, Jev MCP servers for coding agents, what Jev costs, and what is open source. Every guide links to a tool you can try in the browser.
API · Guide
Jev AI API guide: requests, responses, limits and code
Everything you need to call the Jev AI API: three ways in, request and response shapes, limits, errors, and copy-ready code.
MCP · Guide
Jev MCP: connect Jev to Claude Code, Cursor and other agents
What a Jev MCP server does, a side-by-side of the open-source options, and a generator that writes the config for your agent.
Pricing · Guide
Jev pricing explained: what each call really costs
The Jev price in one table, real token counts from 1,153 calls on this site, a cost calculator, and five ways to spend less.
Open source · Guide
Is Jev open source? Weights, licences and open alternatives
A short answer, a layer-by-layer licence check, and the open-weight models you can run yourself instead.
Guide
What Jev does and when to use it
How Jev returns typed answers with probabilities, what independent tests found, and where it performs poorly.
Guide
TypeSafe AI: the company behind Jev, its founders, funding and products
Three cofounders, two years in stealth, a $40M seed at launch and an $870M Series A four weeks later. What TypeSafe AI makes, what it has claimed, and which Jev sites and packages are actually official.
Guide · Open source
Jev architecture and RLCD: what TypeSafe has said, and how open models copy it
TypeSafe has described Jev's design only in outline. What it has said about RLCD and System One models, what open re-implementations do instead, and a fair look at the “it’s just a classifier” debate.
API · Guide
Unofficial Jev API services, $JEV and look-alike models: what to check first
Free Jev APIs funded by a crypto token, resellers charging 6–10× list price, Hugging Face models named JEV that aren't from TypeSafe, and sign-up bots. What each one is, what their own pages say, and the official routes instead.