JEV-35B-NVFP4

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autotrust/JEV-35B with NVFP4 routed experts: the same model in 23 GiB of GPU memory instead of 66 GiB

NVFP4 version

This repository is autotrust/JEV-35B with its 10,240 routed expert MLPs (40 layers × 256 experts) quantized to NVFP4. Everything else is the bf16 model unchanged: attention, linear attention, the shared expert, the routers, the vision tower, the MTP layer, the lm_head, the System 1 adapter, the decision head and the temperatures. Below the NVFP4 comparison, the rest of this card is the JEV-35B card; its tables are the bf16 results unless marked otherwise.

• Text: −0.57 on the Decision Index. All five areas within 1.2 skill points of bf16 (Knowledge 0.422, Language 0.628, Retrieval 0.706, Tools 0.753, Arts 0.413); the largest per-benchmark changes are Home appliance simulator −5.7, CRUXEval −4.7 and GPQA +5.4.
• Images: −0.85 on the vision rebuild, a small but real loss (paired bootstrap 95 % interval −1.5 to −0.2), mostly on CharXiv charts (−5.3).
• Robot arm: 13 of 20 scenes against 15 of 20. Four scenes changed outcome (3 lost, 1 gained), within noise (sign test p = 0.63); every grasped cube still reached the tray (13/13).
• Speed: the same latency as bf16 on one B200 for single requests; the gain is memory (one 32–48 GB GPU is enough).
• Games (seed 0, one run each, noisy): 2048 largest tile 64 (bf16 32), Snake 5 food (bf16 11), Quick, Draw! 85.9 % on finished sketches (bf16 86.3 %), chess mate-in-one 45 % (bf16 47 %), Connect Four 1 win of 6 (bf16 0).

The two videos below were recorded with this NVFP4 checkpoint; per-episode NVFP4 results are in reports/demos-nvfp4/, the bf16 ones in reports/demos/.

What is quantized and how. NVFP4 is NVIDIA's 4-bit floating-point format: FP4 E2M1 values in groups of 16 with an FP8 E4M3 scale per group and an FP32 scale per tensor. Per expert, the gate, up and down projections are quantized (gate and up share one tensor scale, as vLLM fuses them); the expert activations use static scales calibrated on 3,072 System 1 prompts. The checkpoint uses the ModelOpt NVFP4 layout (quant_method: modelopt), so vLLM loads it without any flag. The System 1 adapter has no LoRA on the routed experts, so adapter_vllm/ is the same as for the bf16 model.

Deploy the NVFP4 version (vLLM)

hf download autotrust/JEV-35B-NVFP4 --local-dir JEV-35B-NVFP4
bash JEV-35B-NVFP4/serve.sh     # vLLM on :8000

serve.sh and the API are exactly those of JEV-35B (see Quick start); vLLM reads the quantization from config.json / hf_quant_config.json.

The JEV-35B card (bf16 results)

A System 1 decision model on Qwen3.5-35B-A3B (35 B parameters, about 3 B active per token), up to 256 options in one pass

Decision Index 0.3, public suite: 59.75 (our scoring with the kit), against 53.64 for autotrust/JEV-27B-VL on the board. Approximate public vision score 72.08 (our rebuild of the vision benchmarks; JEV-27B-VL 71.67 on the same rebuild, a tie within noise). Median single-request latency 241 ms on one B200 (JEV-27B-VL 271 ms).

Two models, two organisations. TypeSafe Jev 1.13 is the hosted, closed model made by TypeSafe AI. autotrust/JEV-35B-NVFP4 is an independent open-weights model built by AutoTrust AI; it is not affiliated with, endorsed by, or a product of TypeSafe AI.

Decision Index 0.3 (public suite)

JEV-35B: all 140,178 scoreable requests of the 0.3 public suite answered (0 errors), System 1 only (thinking off), every choice read in one pass (up to 256 options), scored with the kit's score --edition 0.3. Our scoring, not a board entry: the board's Full score also counts private tests (80 %), which only its maintainers run. JEV-27B-VL: the board's public numbers for JEV-27B, whose text decisions JEV-27B-VL reproduces (see the JEV-27B-VL card).

JEV-35B is ahead in all five areas and on 24 of 37 benchmarks. Largest gains (skill points): PhishNChips +42.3, HoVer +28.3, Habermas Machine +28.1, VAST +22.8, WinoGrande +18.9, BANKING77 +18.3, iSarcasmEval +17.2, When2Call +14.9, GPQA +9.5. JEV-27B-VL is ahead on POP909-CL (+25.7), GSM8K (+18.3), ANLI (+11.4), BPoMP (+10.8), NLI4CT (+6.7) and BBH (+4.8).

Every benchmark

Skill rescales the benchmark's own metric so that chance is 0 (below chance counts as 0); = gold benchmark (weight 1.2); the higher score is in bold.

Knowledge & Reasoning (area skill 0.426; JEV-27B-VL 0.414)

Language Understanding (area skill 0.632; JEV-27B-VL 0.564)

Retrieval & Classification (area skill 0.710; JEV-27B-VL 0.537)

Tools & Automation (area skill 0.765; JEV-27B-VL 0.735)

Arts & Human Taste (area skill 0.422; JEV-27B-VL 0.416)

Images (approximate public vision score)

The vision benchmarks of the Decision Index are not published; this is our rebuild of their public datasets (CV-Bench, BLINK, RealWorldQA, CharXiv, InfographicVQA, Mind2Web, CORD + FUNSD, Hateful Memes, R-Bench-M, MMMU-Pro vision; Winoground not included), scored with the board's chance correction and weights. The same rebuild gives JEV-27B-VL 71.67 against its board score of 71.53 on the same benchmarks.

Overall the two models are level: the difference (+0.4) is inside the noise (paired bootstrap 95% interval −0.7 to +1.6). Only two per-benchmark differences are statistically significant (paired McNemar test, p < 0.01), both in favour of JEV-35B: moderation (+9.6) and MMMU-Pro (+4.3). The small deficits on RealWorldQA, CV-Bench, BLINK, InfographicVQA and R-Bench-M (−1 to −3) are not significant. The vision tower is Qwen3.5-35B-A3B's, unchanged; image decisions are zero-shot.

Speed

One sequential client, the same 587 rows (387 text rows sampled across the Decision Index, 200 image rows), POST /v1/decide on serve.sh (vLLM, System 1 as a LoRA), one B200:

Computer use, robot arm and games

Same demo code, seeds, scenes and opponents as the JEV-27B-VL card; every step is one System 1 decision (POST /v1/decide, thinking off), one model on one B200.

Computer use: screenshot → which element to click. A real browser (headless Chromium). Every clickable element gets a numbered box; System 1 picks the next click (or "the task is complete"), the browser clicks it, and the loop repeats.

Robot arm: pick and place from a camera image (MuJoCo). At every step System 1 answers two questions from the top camera: is the target left or right of the gripper, and above or below it? The arm halves its step whenever an answer flips.

• Computer use with element text: 95%, the same three failures as JEV-27B-VL (shop seeds 12, 15, 20: the colour swatch carries no text and is skipped).
• Numbered boxes only (every element read from pixels): 38% against 10%. JEV-35B completes 90% of the settings tasks but only 15% of mail and 10% of shop; most failures still declare the task complete too early (24 of 37).
• Robot arm: same success rate, different scenes. Each model misses 5 of 20 grasps (both miss scenes 4 and 19), every miss 3 cm or more off the cube centre; once grasped, every cube reaches the tray.
• Choosing directly among 8 motor commands fails for both models; decompose control into simple visual questions.

Games (seed 0 for both models; board as image + text):

For game play, use JEV-27B-VL. Over five seeds JEV-35B's largest 2048 tile averages 64 (random play: 102), it passes no Flappy Bird pipe and eats 3–18 pieces of food in Snake (mean 10). Per-episode results: reports/demos/.

Quick start (vLLM)

hf download autotrust/JEV-35B-NVFP4 --local-dir JEV-35B-NVFP4
bash JEV-35B-NVFP4/serve.sh    # vLLM on :8000; one GPU with 32 GB or more

serve.sh runs serve_decide.py: the standard vLLM OpenAI server (same flags as vllm serve) with a POST /v1/decide route. Plain requests are System 2; requests for the LoRA module jev-decision (adapter_vllm/: backbone LoRA + the decision head as an lm_head LoRA) are System 1. Tested with a vLLM development build from September 2026.

The adapter has no LoRA on the routed experts. serve.sh sets JEV_DECIDE_NO_MOE_LORA=1 and --lora-target-modules so that the routed experts run on vLLM's normal MoE kernels (the decision head needs --max-lora-rank 320; vLLM's MoE-LoRA kernel supports at most rank 128).

System 1: POST /v1/decide

curl localhost:8000/v1/decide -H 'Content-Type: application/json' -d '{
  "kind": "choice",
  "state": "Customer message: my card was charged twice for the same order.",
  "question": "Which team should handle this ticket?",
  "options": ["billing", "shipping", "technical support", "account security"]}'

The response has options, probabilities, choice, choice_index and usage. GET /v1/decide/info lists the defaults.

System 2

import requests
requests.post("http://localhost:8000/v1/chat/completions", json={
    "model": "autotrust/JEV-35B-NVFP4",
    "messages": [{"role": "user", "content": "In one sentence, what is safety stock?"}],
    "max_tokens": 200})

If you call /v1/completions for System 1 yourself, pass top_k: 0 and top_p: 1.0 so that the returned probabilities are not truncated.

Engine and read-out

System 1 reads the hidden state at the last token of a bare-text prompt:

[kind] choice
[state] ...
[question] ...
[options]
A) ...
B) ...
[decision]:

A 264-slot linear head (fp32) gives one logit per slot; the active slots of the question's kind are soft-maxed with a per-kind temperature (calibration.json). In vLLM the head is expressed as an lm_head LoRA (adapter_vllm/, rank 320) and the head bias is added client-side (adapter_vllm/decision_head.json).

Limitations

• System 1 only on this card: thinking (adaptive System 2) has not been evaluated for this model.
• Knowledge & Reasoning is the weak area (GPQA 0.360, MMLU-Pro 0.642, HLE below chance); JEV-27B-VL is better on GSM8K, ANLI and BBH.
• Weaker than JEV-27B-VL at sequential game play (2048, Flappy Bird, Snake).
• The vision score is our rebuild, not the board's; image decisions are zero-shot.
• NVFP4: Decision Index −0.57 and vision −0.85 against bf16; only the B200 (SM100) kernels were tested.
• English-centric; not for high-stakes decisions without confidence gating.

Files

model-*.safetensors       Qwen/Qwen3.5-35B-A3B with NVFP4 routed experts (ModelOpt layout), everything else bf16
config.json · hf_quant_config.json · nvfp4_activation_amax.json
                          quantization config and calibrated expert activation ranges
tokenizer* · chat_template.jinja · generation_config.json · *_config.json
adapter/                  System 1 LoRA (peft), rank 32
head.safetensors          264-slot decision head (fp32)
judge_config.json         slot layout, verbalizer ids, read-out
calibration.json          per-kind temperatures
adapter_vllm/             System 1 for vLLM: backbone LoRA + the head as an lm_head LoRA (rank 320), plus decision_head.json
serve_decide.py · serve.sh
                          vLLM server with POST /v1/decide next to the OpenAI endpoints
videos/                   computer-use and robot-arm episodes
reports/demos/            per-episode computer-use, robot-arm and game results (bf16)
reports/demos-nvfp4/      the same for this NVFP4 checkpoint

License

Apache-2.0. This repository contains the weights of Qwen/Qwen3.5-35B-A3B (Apache-2.0), with the routed experts quantized to NVFP4, plus the System 1 adapter, decision head and calibration of autotrust/JEV-35B.