Prior-Labs/tabpfn_3

Model Overview

TabPFN-3 is a transformer-based foundation model that uses in-context-learning to solve tabular prediction problems in a forward pass. Inference code can be found at https://github.com/PriorLabs/TabPFN. More details can be found in the Model Report.

Getting started

First, install the inference package:

pip install tabpfn

Fitting a classifier and predicting looks like this:

from sklearn.datasets import load_breast_cancer
from sklearn.model_selection import train_test_split
from tabpfn import TabPFNClassifier

X, y = load_breast_cancer(return_X_y=True)
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.5, random_state=42)

clf = TabPFNClassifier()
clf.fit(X_train, y_train)
prediction_probabilities = clf.predict_proba(X_test)
predictions = clf.predict(X_test)
print("Accuracy", accuracy_score(y_test, predictions))

For more examples (e.g. how to train a regressor), see the github repo: https://github.com/PriorLabs/tabPFN!

Specialized checkpoints

TabPFN-3 ships with default classification and regression checkpoints, plus a few experimental specialized variants. We recommend starting with the defaults — the variants can be useful in ensembling or HPO setups, or tried manually in the regime they were trained for. Their name suffixes indicate what we expect them to be good at.

The following specialized checkpoints are available:

Checkpoint	Task	Specialization
tabpfn-v3-classifier-v3_20260417_binary.ckpt	Classification	Specialized for binary classification for datasets with <200k rows
tabpfn-v3-classifier-v3_20260417_multiclass.ckpt	Classification	Specialized for multiclass classification for datasets with <200k rows
tabpfn-v3-regressor-v3_20260417_mediumdata.ckpt	Regression	Specialized for regression for datasets with <100k rows and with alternative preprocessing
tabpfn-v3-regressor-v3_20260506_timeseries.ckpt	Regression / Time-series forecasting	Fine-tuned on synthetic time-series data; used by default in TabPFN-TS-3
tabpfn-v3-classifier-v3_ood.ckpt	Classification	Useful when test inputs may fall outside the training distribution and you want the model to extrapolate. See Figure 26 in the model report. Bundles OOD-robust preprocessors (squashing_scaler_max10 + none), similar to default otherwise.
tabpfn-v3-regressor-v3_ood.ckpt	Regression	Useful when test inputs may fall outside the training distribution and you want the model to extrapolate. See Figure 26 in the model report. Bundles OOD-robust preprocessors (quantile_uni_extrapolate + squashing_scaler_max10), similar to default otherwise.

To use one of these checkpoints, pass its filename via model_path:

from tabpfn import TabPFNClassifier

clf = TabPFNClassifier(model_path="tabpfn-v3-classifier-v3_20260417_binary.ckpt")

Developers & Affiliations

Developed by Prior Labs.

Intended Use

Regression and classification tasks with up to 1M samples and ≤2000 features in structured tabular format.

Not Intended Use

• Not suitable for unstructured data (text, images); use API version for textual features.
• Performance not guaranteed above 1M train samples or >2000 features.

Model Architecture

Multi-stage transformer-based architecture with 24 main layers.

Training Data and Priors

TabPFN-3 is trained purely on synthetic tabular tasks.

Performance Benchmarks

Evaluated on public benchmarks such as TabArena and TALENT, the model yields SOTA results. On proprietary benchmark collections, it yields SOTA results for datasets with <100k rows and datasets with 100k-1M rows and <200 features.

Ethical Considerations

Having been trained purely on synthetic datasets, TabPFN-3 is free from dataset leakage from the pretraining stage. However, like for any other tabular prediction method, when applied to high-risk use cases, users should ensure that the labelled data is free of biases.

Limitations

Performance can degrade when applied to >1M data points and/or >2000 features.

Licensing

Model weights released under tabpfn-3-license-v1.0.

The license is designed to be permissive for research and limited internal evaluation. It explicitly allows testing, evaluation, and internal benchmarking, so an organization can download the model and run preliminary assessments on its own datasets. The key restriction is that the model, its derivatives, and its outputs cannot be used for any commercial or production purpose. This includes, but is not limited to, revenue-generating products, competitive benchmarking for procurement, client deliverables, or using the model’s results for internal commercial decision-making. For all production use cases, we offer a Commercial Enterprise License. This provides access to our proprietary high-speed inference engine, dedicated support, integration tooling, and other internal models. Please contact us at sales@priorlabs.ai for commercial licensing inquiries.

Version

v1.0: initial release.

Citation

@misc{grinsztajn2026tabpfn3technicalreport,
      title={TabPFN-3: Technical Report}, 
      author={Léo Grinsztajn and Klemens Flöge and Oscar Key and Felix Birkel and Philipp Jund and Brendan Roof and Mihir Manium and Shi Bin and Hoo and Magnus Bühler and Anurag Garg and Dominik Safaric and Jake Robertson and Benjamin Jäger and Simone Alessi and Adrian Hayler and Vladyslav Moroshan and Lennart Purucker and Philipp Singer and Alan Arazi and Julien Siems and Jan Hendrik Metzen and Georg Grab and Nick Erickson and Siyuan Guo and Eliott Kalfon and Simon Bing and David Salinas and Clara Cornu and Lilly Charlotte Wehrhahn and Diana Kriuchkova and Kursat Kaya and Lydia Sidhoum and Marie Salmon and Jerry Chen and Madelon Hulsebos and Yann LeCun and Samuel Müller and Bernhard Schölkopf and Sauraj Gambhir and Noah Hollmann and Frank Hutter},
      year={2026},
      eprint={2605.13986},
      archivePrefix={arXiv},
      url={https://arxiv.org/abs/2605.13986}, 
}