Typed output
Use choice, score, or noul results directly in branches, thresholds, and review gates.
Decision model
Put a typed decision in the middle of your workflow.
Use this model when your application has context and needs a clear, machine-readable signal before it routes, evaluates, or acts.
Use the exact model ID shown in this page. Credits follow the same Jev rule as the other decision models.
A decision boundary
respan/span-01-lite:freeState in. Structured signal out.
State
A workflow has enough context to choose a safe next step.
Choice
Route to the approved path
Score
0.84 confidence
Noul
Escalate if evidence is incomplete
Keep permissions, side effects, and final actions in your application.
Input
State + typed questions
Output
Choice · score · noul
Billing
Same as Jev
Endpoint
POST /v1/systemone
Why this model
A small decision surface for production workflows.
Keep the model focused on one bounded judgment and let your application own everything that happens after it.
Inspectable state
Record the state, question, answer, and confidence together for debugging and evaluation.
Controlled action
Treat the model as a signal; keep tools, permissions, writes, and side effects in code.
Where it fits
Use it between context and action.
Start with a decision that has a small set of valid outcomes and an explicit fallback.
PatternUse it forGood boundary
Routing
Choose a team, queue, or next step
Return an approved route
Evaluation
Score quality or readiness
Gate the next workflow
Safety boundary
Detect uncertainty or risk
Escalate before side effects
Call the model
Use the shared Jev API shape.
Set the model ID shown on this page and keep the rest of the System One request unchanged.
- Set model to the exact model ID shown below.
- Send the current state as a compact string or JSON-serializable value.
- Ask one or more typed questions and handle the returned answer in application code.
The model ID is shown in the example request and Playground selector.
Put business context in state and the decision contract in questions.
Validate confidence and fallback conditions before taking an irreversible action.
Example request
curl -X POST https://thejevai.com/v1/systemone \
-H "Authorization: Bearer <API_KEY>" \
-H "Content-Type: application/json" \
-d '{
"model": "respan/span-01-lite:free",
"state": "A customer request needs a safe next step.",
"questions": {
"route": {
"type": "choice",
"instructions": "Choose the correct next step.",
"criteria": {
"continue": "Continue the approved workflow",
"review": "Send the case for human review"
}
}
}
}'Keep the API key on your server. The Playground uses the same request shape through your signed-in session.
Build with it
Make the next step explicit.
A typed signal is easiest to operate when the owner, allowed outcomes, and fallback are already clear.
Support triage
Route a case while keeping the customer-facing action under application control.
Agent guardrail
Check a requested tool path before permissions and side effects are applied.
Quality gate
Turn a rubric into a score or noul signal for review and regression workflows.
FAQ
Keep the integration bounded.
How do I select this model?
Set model to the exact ID shown on this page in the POST /v1/systemone request, or choose it in the Playground.
Does it use the Jev billing rule?
Yes. Supported decision models use the same Jev-based credit rule. Validate quality, latency, and availability with your own cases.
Can it execute actions directly?
No. Use the response as a typed recommendation and keep tools, permissions, writes, and human review in your application.
References
Keep every layer visible.
OpenRouter model page
Check current availability and provider-specific details before production use.
Jev API documentation
Follow the shared request, response, authentication, and error contract.
Your evaluation set
Measure route accuracy, confidence, latency, and review rate with representative cases.
Start with a bounded question
Give your workflow a decision boundary.
Try the model in the Playground, then move the same request to your server when the output is stable.