The Apache OpenNLP team is pleased to announce the release of Apache OpenNLP 2.5.6.1.
The Apache OpenNLP library is a machine learning based toolkit for the processing of natural language text.
It supports the most common NLP tasks, such as tokenization, sentence segmentation, part-of-speech tagging, named entity extraction, chunking, parsing, and coreference resolution.
Apache OpenNLP 2.5.6.1 binary and source distributions are available for download from our download page.
The OpenNLP library is distributed by Maven Central as well. See the Maven dependency page for more details.
This release fixes a regression in 2.5.6 related to sentence detection with an abbreviation dictionary.
For further details, check the full list of changes via the project’s issue tracker.
--The Apache OpenNLP Team
20 October 2025