JevK5
Quadrant scores
See the full quadrantScored with the public quadrant rubric (maturity × capability; bubble = adoption). Revise as evidence lands.
- Maturity3.5/10
Apache-2.0 weights available; runtime published; JevBench v1.4.2 scores independently verified; no hosted inference or SLA.
- Capability7.4/10
JevBench v1.4.2 verified: #3 overall (62.04), #1 pure Apache-2.0 open-weight. Choice+Score via jevk5 runtime.
- Adoption12/100
Brand-new release (23 Sep 2026). HF page up; community uptake unknown.
Vendor claims
- H100 latency ~9ms[Vendor claim — not independently verified]
JevK5 is an open-weight Jev alternative based on Qwen3.5-4B with LoRA merged. It uses a one-pass softmax readout — it does not generate text, so there is nothing to parse and nothing to hallucinate. Released under Apache-2.0.
JevBench v1.4.2 confirms #3 overall (62.04 score) and #1 among pure Apache-2.0 open-weight models — Decider-4B is also open but uses mixed licensing for some components.
A smaller JevK5-2B variant (Qwen3.5-2B) ships in the same family for lighter deployments (~3.5GB bf16).
Specs
| Attribute | Value |
|---|---|
| Author | alibiserikbay (independent) |
| Base model | Qwen3.5-4B + LoRA merged |
| License | Apache-2.0 |
| Launch | |
| Status | Open weights (Hugging Face) |
| Latency | ~9ms on H100 (UnverifiedClaim) |
| Pricing | Self-host only (free weights) |
| Decision types | Choice, Score (via jevk5 runtime) |
| Context | 32K (inherited from Qwen3.5) |
| Smaller variant | JevK5-2B — Qwen3.5-2B base |
| GGUF | JevK5-GGUF |
Architecture
JevK5 follows the one-pass softmax pattern: given state and typed questions, it produces probabilities over options without generating tokens. The jevk5 Python runtime handles the inference loop and exposes Choice, Score, and Noul question types (verify Noul support in the runtime docs).
JevBench v1.4.2 (verified)
| Metric | JevK5 | JevK5-2B | Rank |
|---|---|---|---|
| Overall | 62.04 | 56.48 | #3 / #9 |
| Intelligence | 48.6 | 46.2 | - |
| Calibration | 77.0 | 71.3 | - |
| Speed | 86.1 | 89.7 | - |
| Cost | 59.7 | 68.2 | - |
JevK5 holds #3 overall and #1 among pure Apache-2.0 open-weight models (Decider-4B is also open but uses mixed licensing for some components).
Fit / anti-fit
Fit when you need: self-hosted typed decisions, Apache-2.0 deployment, latency-sensitive routing on capable hardware.
Anti-fit when you need: hosted inference, production SLA, generation, or workflows that require free-text output.