This is the AI-ready benchmark dataset (OPSSAT-AD) containing the telemetry data acquired on board OPS-SAT---a CubeSat mission that has been operated by the European Space Agency. It is accompanied by the paper with baseline results obtained using 30 supervised and unsupervised classic and deep machine learning algorithms for anomaly detection. They were trained and validated using the training-test dataset split introduced in this work, and we present a suggested set of quality metrics that should always be calculated to confront the new algorithms for anomaly detection while exploiting OPSSAT-AD. We believe that this work may become an important step toward building a fair, reproducible, and objective validation procedure that can be used to quantify the capabilities of the emerging anomaly detection techniques in an unbiased and fully transparent way. The included files are: segments.csv with the acquired telemetry signals from ESA OPS-SAT aircraft, dataset.csv with the extracted, synthetic features are computed for each manually split and labeled telemetry segment. code files for data processing and example modeliing (dataset_generator.ipynb for data processing, modeling_examples.ipynb with simple examples, requirements.txt- with details on Python configuration, and the LICENSE file) Please have a look at our two papers commenting on this dataset: The benchmark paper with results of 30 supervised and unsupervised anomaly detection models for this collection:Ruszczak, B., Kotowski. K., Nalepa, J., Evans, D.: The OPS-SAT benchmark for detecting anomalies in satellite telemetry, 2024, preprint arxiv: 2407.04730, the conference paper in which we presented some preliminary results for this dataset:Ruszczak, B., Kotowski. K., Andrzejewski, J., et al.: (2023). Machine Learning Detects Anomalies in OPS-SAT Telemetry. Computational Science – ICCS 2023. LNCS, vol 14073. Springer, Cham, DOI:10.1007/978-3-031-35995-8_21.