JEV / SYSTEM ONE
Uses the Jev decision playground
Send model, state and a keyed questions object to /v1/systemone, then read data.result.answers. Text, JSON objects and arrays use the existing Choice, Score and Noul contract through OpenRouter.
UPSTAGE / OPENROUTER
Solar Decide Flash
Upstage’s low-latency Solar Decide variant is built on Solar Mini 4. Classify, route and score shared text or JSON with structured answers and probabilities through the same playground and API as Jev.
upstage/solar-decide-flashTextJSON
New accounts get 100 credits. The playground and API share one balance.
Context window
524,288
tokens · provider-listed maximum
OpenRouter input price
$0.05 / 1M
per million input tokens
OpenRouter output price
$0 / 1M
output tokens are free upstream
This site's input rate
720
credits per million input tokens · minimum 1 per successful request
SPAN / NOUL
How it differs from Span
Span accepts only Noul behavior questions and requires text or a specific input/output conversation object. This model also accepts Choice and Score questions, with text, generic JSON objects, or arrays as state. Use the Jev playground for this broader decision contract.
Three structured answer types
Choice returns a named option and its probability distribution. Score returns a value on an ordered scale with probabilities. Noul returns the probability of a yes/no condition. Multiple questions share the same state.
choicescorenoul
OpenRouter lists a 524,288-token provider context. This platform accepts up to 8 questions and 32 KiB for text plus questions. Choice accepts 2–26 options, Score accepts 2–10 ordered levels, and Noul accepts optional true/false criteria. Image input is not supported.
Uses OpenRouter’s decisions endpoint with model upstage/solar-decide-flash. Upstage serves this model through its System One API. The published context is the provider maximum; platform request limits still apply.
Input and output credits
OpenRouter currently lists $0.05 per million input tokens and $0 for output. The playground, API and evaluation charge 720 credits per million actual input tokens, rounded up with a minimum of 1 credit per successful request. Provider input usage includes questions. Output is free; failed requests release the reservation.
max(1, ceil(input_tokens × 720 / 1,000,000))
A successful request with 1,000 input tokens costs 1 credit; 5,000 input tokens cost 4 credits. Output tokens add no charge. Failed calls release the credit reservation.
Verified October 8, 2026: provider metadata and synthetic calls with text, object and array state, all three answer types, 8 questions, 26 Choice options, 10 Score levels, and Noul without criteria. These are interface compatibility checks, not an accuracy benchmark or latency guarantee.
Try Solar Decide Flash with your own state
The Jev workbench below starts with this model selected. Try a recipe, edit the state and questions, or export API code. This page stores its browser draft separately from other model pages and the main playground.
What do you want to decide?
Choose a task to load its input and rules. Loading examples uses no credits.
OpenRouter provider context: 524,288 tokens. This platform: 8 questions, 2–26 Choice options and 32 KiB text plus questions. Text and JSON only; image input is not supported.
Maximum credit budget: 1 credits
We reserve this budget before the model runs, then charge actual usage and return the difference. Failed calls are refunded.
New account? Receive 100 credits once. Short requests typically use 1 credit; longer inputs can use more.
100 welcome credits · one balance for web & API
Draft saved in this browser · Your draft will be restored after sign-in.
Your current configuration stays in this browser tab for the setup flow.
ILLUSTRATIVE EXAMPLE · NO CREDITS USED
“I was charged twice this morning. Please refund the duplicate payment today.”
One input → structured decisions
Choice
Billing
Route to the billing queue
Yes / no
96%
Probability of an urgent request
Score
2.8 / 3
Urgency on a 0–3 scale
Static illustration of the output format. Values are not a live model response or a measure of accuracy.
Test the same cases against two rule sets
Capture A, change the model or questions in the workbench, then capture B. Both versions use identical states.
Capture A from the current workbench model and rules. Change the model or questions, then capture B. Import up to 25 labeled cases and compare both versions. The dataset state replaces each captured state.
This simulates a policy, not accuracy. Noul uses max(P(yes), P(no)); Choice and Score use your selected signal. Validate thresholds on labeled cases.
Maximum credit budget: — credits
Total budget across both versions and all cases. Each request reserves its own allowance, then settles actual usage and refunds the remainder. Stopping preserves charges for completed requests.
New account? Receive 100 credits once. Short requests typically use 1 credit; longer inputs can use more.
Each successful comparison request uses credits. Review the total budget before starting. Requests run sequentially; stopping keeps charges for completed requests. Export includes rules, cases, results and errors. Closing this page stops the comparison.
Web runs and saved configurations are private to your account. API history stores usage only. Embedded image pixels are omitted from drafts, configurations and history; metadata and missing-image counts remain. Add the images again before replaying. API URL references may expire. API setup exports local-file code without storing pixels.Usage ↗
Use the same decision API
Send model, state, and questions to Decisions API's /v1/systemone endpoint with an API key created here. Set model to upstage/solar-decide-flash; answers are in data.result.answers and token usage is in data.result.usage.
// Server-side JavaScript (Node 20+ or Bun). Set DECISIONS_API_KEY.
const response = await fetch("https://decisions-api.dev/v1/systemone", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.DECISIONS_API_KEY}`,
"Content-Type": "application/json",
},
body: JSON.stringify({
"model": "upstage/solar-decide-flash",
"state": "I was charged twice for order A-4471. Please refund the duplicate payment.",
"questions": {
"route": {
"type": "choice",
"instructions": "Which team should handle this ticket? Use other when no option fits.",
"criteria": {
"billing": "Payments, charges and refunds",
"technical": "Bugs and product errors",
"account": "Login and account access",
"other": "None of these teams"
}
}
}
}),
});
const body = await response.json();
if (!response.ok || body.code !== 0) throw new Error(body.message);
console.log(body.data.result.answers);
console.log(body.data.creditsUsed);