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Jared Palmer: Kev 4BNEW
jaredpalmer/kev-4bdecisions
Kev 4B is a small open-weight decision model from Jared Palmer — a LoRA adapter and pointer head on Qwen3.5-4B-Base, served over the same /v1/systemone contract as TypeSafe's Jev. Send state and typed questions — noul (yes/no), choice (one of N), score (position on a scale) — and get a calibrated probability per question in a single forward pass, with no generated text. The recommended checkpoint of the Kev family (0.8B, 4B, 9B) for routing, classification and policy checks that want a compact, Apache-2.0 alternative to Jev. 8,192-token context.
Price request / response
Context
8K
Released
Sep 25, 2026
Parameters
staterequiredquestionsrequiredtypenoul · choice · scoreHow to use via API
import requests
r = requests.post(
"https://api.mixen.ai/v1/decisions",
headers={"Authorization": "Bearer mxn-..."},
json={
"model": "jaredpalmer/kev-4b",
"state": "Help! My payouts have been failing for 3 days.",
"questions": {
"is_urgent": {
"type": "noul",
"instructions": "Does this message convey urgency?",
"criteria": {"true": "Explicitly time-sensitive",
"false": "No urgency expressed"},
},
"department": {
"type": "choice",
"instructions": "Which team should handle this?",
"criteria": {"billing": "Payments, invoicing, refunds",
"technical": "Bugs, outages, integrations"},
},
},
},
)
answers = r.json()["answers"]
if answers["is_urgent"]["noul"] > 0.8 and answers["department"]["choice"] == "billing":
escalate_to_billing()