The CLEF-2026 CheckThat! Lab
Advancing Multilingual Fact-Checking
Julia Maria Struß (University of Applied Sciences Potsdam)
Sebastian Schellhammer (GESIS - Leibniz Institute for the Social Sciences, Universität Düsseldorf)
Stefan Dietze (GESIS - Leibniz Institute for the Social Sciences, Universität Düsseldorf)
V. Venktesh (Stockholm University)
Vinay Setty (Universitetet i Stavanger)
Tanmoy Chakraborty (Indian Institute of Technology Delhi)
Preslav Nakov (Mohamed Bin Zayed University of Artificial Intelligence)
Avishek Anand (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Primakov Chungkham (External organisation)
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Abstract
The CheckThat! lab aims to advance the development of innovative technologies combating disinformation and manipulation efforts in online communication across a multitude of languages and platforms. While in early editions the focus has been on core tasks of the verification pipeline (check-worthiness, evidence retrieval, and verification), in the past three editions, the lab added additional tasks linked to the verification process. In this year’s edition, the verification pipeline is at the center again with the following tasks: Task 1 on source retrieval for scientific web claims (a follow-up of the 2025 edition), Task 2 on fact-checking numerical and temporal claims, which adds a reasoning component to the 2025 edition, and Task 3, which expands the verification pipeline with generation of full-fact-checking articles. These tasks represent challenging classification and retrieval problems as well as generation challenges at the document and span level, including multilingual settings.
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File under embargo until 24-09-2026