System One model · $0.042 per million input tokens

Fast, typed decisions for your agents.

Jev doesn't write text. It picks: which tool to call, whether a call is safe, where a ticket goes. It answers in under half a second, with a probability on every option. Every demo shows the real request and response.

User asks the agent
"Delete every file in my drafts folder."
delete_file
82%
changes data?
98%
missing info?
44%
manipulation?
4%
Confirm, then calljev · 0.39 s
~0.4 sper decision, measured on the live API
20–27×cheaper than Claude Haiku 4.5 on agent runs
Output freebilled on input tokens only
Probabilitieson every answer, so you know when to ask a human
Describe the situationPlain text state: a message, a tool call, a game frame.
Ask typed questionschoice, noul (yes/no) or score, many in one call.
Act on the answerTyped values with probabilities. No parsing, no free text.

Agent decisions & tool calling

What agents decide between steps.

Tool router New

Which tool should the agent call, and should it go ahead, confirm first or ask a follow-up? Bring your own tool list.

/toolsOpen →

Tool-call guardrail New

Checks a call before it runs: off task, destructive, leaking secrets or following planted instructions. Then it runs the call, asks the user or blocks it.

/guardOpen →

Jev runs the agent loop New

A support agent with seven tools. Jev picks every step until it replies or escalates, and it spots planted instructions in tool results.

/agentOpen →

Help-desk triage

Eight questions in one call decide who handles a complaint: the agent on its own, the agent after a person confirms, or a person.

/sendOpen →

Classification & real-time control

Sorting at scale, and decisions every 0.1 s.

Sort an inbox

1,000 real Enron emails classified live (category, priority, spam, reply needed), or your own Gmail by subject line only.

/mailOpen →

Smart paste

Copy a whole résumé once and paste it into any form field. Jev picks the exact snippet that belongs there.

/pasteOpen →

Jev plays Flappy Bird

Flap or wait, decided live from a text description of the game, several decisions every second.

/flappyOpen →

Jev plays the Dino game

The Chrome T-Rex runner: jump, duck or keep running, decided every 0.1 s from the cactus or bird ahead.

/dinoOpen →