pplx-decider-v1.1-27b

pplx-decider-v1.1-27b is an update of our pplx-decider-v1-27b model, that boost the Decision Index score from 56.4 to 61.56, now outperforming Jev by more than 3.5 points, while using the same backbone. Most of the gains are driven by the lifting of the causal mask and training on more data, including data from tasksource.

Evaluation

Decision Index category	Jev	pplx-decider-v1-27b	pplx-decider-v1.1-27b
Knowledge	51.4	40.9	48.18
Language	62.0	63.5	69.45
Retrieval	55.4	54.9	61.26
Tools	75.1	79.3	78.88
Arts	37.7	39.4	44.66
Overall Decision Index	57.9	56.4	61.56

The overall score uses the suite's weighting, not a simple category average.

Checkpoint format and serving

This is the native decision-checkpoint layout: a Qwen3_5Model backbone plus readout.safetensors containing a BF16 [255, 5120] decision head. The Transformers class name does not change the base model identity, Qwen3.8-27B.

Use the included inference implementation to preserve the evaluated behavior:

• Full-attention layers use the saved noncausal attention mode. The model's linear-attention layers retain their native behavior. Default causal inference does not reproduce this checkpoint's evaluated setup.
• The supplied DecisionModel.predict applies the saved calibration temperature. When using logits directly, apply it exactly once and normalize over the valid candidates for the current decision.
• This artifact has a separate readout, not a full-vocabulary lm_head. A serving system requiring Qwen3_5ForConditionalGeneration needs a separate export, mapping readout row i into vocabulary row decision_config.json["token_ids"][i]. Such an export must also preserve the attention behavior. If the frontend applies temperature, use the value above.

Usage

Use Python 3.12+, authenticated Hugging Face access to this private repository, and a CUDA GPU with room for roughly 49 GiB of weights plus working memory. Download the repository and install its pinned requirements.txt dependencies.

import sys
from pathlib import Path
from huggingface_hub import snapshot_download

checkpoint = Path(snapshot_download("perplexity-ai/pplx-decider-v1.1-27b"))
sys.path.insert(0, str(checkpoint / "source" / "src"))
from autojev.model import DecisionModel, answer

model = DecisionModel(checkpoint, device="cuda")
question = {
    "type": "choice",
    "instructions": "Which team should handle this request?",
    "criteria": {
        "billing": "Charges and refunds",
        "support": "Technical integration errors",
        "sales": "Questions about buying a product",
    },
}
row = {"state": "My integration keeps failing. Please help.", "question": question}
probabilities = model.predict([row])[0]
print(answer(question, probabilities))

Images

Pass images as file paths, PIL images, or data:image/...;base64 URLs in row["images"]. The processor resizes them while preserving aspect ratio. Each side is rounded to a multiple of 32 px, and the total area is kept between 256×256 (65,536 px) and max_image_pixels. Each 32×32 patch costs one visual token, so an image uses about width * height / 1024 tokens.

max_image_pixels defaults to 2048×2048 (4,194,304 px, ≤4,096 tokens per image). Larger images are downscaled automatically, so you don't need to resize them yourself. To lower or raise the cap:

model = DecisionModel(checkpoint, device="cuda", max_image_pixels=1600 * 1000)

Keep in mind:

• The text and all images of a decision must fit in prepare's 8,192-token limit. Inputs are rejected rather than truncated. With several images per decision, lower max_image_pixels or downscale the images first.
• Training and the reported evaluation capped images at 512×512 (262,144 px, ≤256 tokens). Higher resolutions keep more detail but fall outside the training distribution, and they cost more memory and latency. To reproduce the evaluated setup exactly, use max_image_pixels=512 * 512.
• If you resize images yourself, scale both sides by the same factor min(1, sqrt(max_image_pixels / (width * height))) to keep the aspect ratio.

source/src/autojev/model.py is the evaluated training-run code, with one change: the image-size cap is now the configurable max_image_pixels. It was previously hardcoded at 512×512 pixels. release-manifest.json records file checksums and checkpoint provenance.

Acknowledgment

A large part of the gains are thanks to the tasksource data. If you also use this data, consider citing the corresponding article

@inproceedings{sileo-2024-tasksource,
    title = "tasksource: A Large Collection of {NLP} tasks with a Structured Dataset Preprocessing Framework",
    author = "Sileo, Damien",
    booktitle = "Proceedings of the 2024 Joint International Conference on Computational Linguistics, Language Resources and Evaluation (LREC-COLING 2024)",
    month = may,
    year = "2024",
    address = "Torino, Italia",
    publisher = "ELRA and ICCL",
    url = "https://aclanthology.org/2024.lrec-main.1361",
    pages = "15655--15684",
}