# Kailune-AI: pjev-2b

> A 2.5B typed-decision model: a LoRA merged into MiniCPM5-2B that answers choice, score and yes/no questions in one forward pass by reading the answer-letter logits, giving a probability per option and no generated text. Apache-2.0; shipped uncalibrated.

- Page: https://systemonemodels.ai/kailune-ai/pjev-2b
- API: https://api.systemonemodels.ai/v1/models/kailune-ai/pjev-2b
- Download: `pip install systemonemodels && systemone pull kailune-ai/pjev-2b`

## Facts

| | |
|---|---|
| Maker | Kailune-AI (https://systemonemodels.ai/kailune-ai) |
| Decides | choice, score, noul |
| Architecture | pjev |
| Base model | openbmb/minicpm5-2b |
| Parameters | 2.5B |
| Licence | apache-2.0 |
| Availability | Open weights |
| Released | 2026-09-28 |
| Latest version | 2026.09 |

## Reported evaluation

Suite: JevBench public set (231 items; 175 correct), the maker's own run at revision ad60e59, not an official score. Numbers are the publisher's own.

- Decision accuracy: 75.8%

## Model card

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# pjev-2b

A 2.5B typed-decision model: a LoRA merged into MiniCPM5-2B that answers choice, score and yes/no questions in one forward pass by reading the answer-letter logits, giving a probability per option and no generated text. Apache-2.0; shipped uncalibrated.

A personal project. A rank-64 LoRA folded into MiniCPM5-2B and published as one stock checkpoint; no head is added and nothing is decoded. Options are read as letters at a single position, and several questions about one state share a prefix (8.0 ms per question when six share a state). Includes serve.py, a TypeSafe-compatible /v1/systemone server. Not calibrated (temperature 1, hard-tier ECE 0.120 by the maker's measure); no abstention; English only; more than 26 options fall back to a tournament approximation. The maker's run on JevBench's 231 public items is not an official score: easy 48/48, standard 59/72, hard 68/111; JevBench has it in its queue. Trained on Caio Vicentino's CC BY 4.0 eikos-decisions dataset, with MIT serving code from his Eikos project; the maker discloses that an earlier data snapshot included rows later withdrawn for overlapping the Decision Index test set, and reports no Decision Index result.

## What it decides

- **choice** — picks one option from a set
- **score** — places the input on an ordered scale
- **noul** — answers a yes/no question with one probability

## At a glance

| | |
|---|---|
| Parameters | 2.5B |
| Base model | `openbmb/MiniCPM5-2B` |
| Maker | Kailune-AI |
| Released | 2026-09-28 |
| License | apache-2.0 |
| Reported accuracy | 75.8% |
| Reported latency | 20.5 ms per single question on one H100, in-process, batch 1 |

## Get the weights

```bash
pip install systemonemodels
systemone pull kailune-ai/pjev-2b
```

The files are served from the maker's Hugging Face repository, [`Kailune-AI/pjev-2b`](https://huggingface.co/Kailune-AI/pjev-2b), and verified against the checksums recorded here.

## Read more

- [Model card](https://huggingface.co/Kailune-AI/pjev-2b)

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