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The CLEF-2026 CheckThat! Lab: Advancing Multilingual Fact-Checking

2026-02-10 · Julia Maria Struß, Sebastian Schellhammer, Stefan Dietze, Venktesh V, Vinay Setty, Tanmoy Chakraborty, Preslav Nakov, Avishek Anand, Primakov Chungkham, Salim Hafid, Dhruv Sahnan, Konstantin Todorov arxiv

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.

📄 PDF Abstract BibTeX arXiv:2602.09516

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UPV at CheckThat! 2021: Mitigating Cultural Differences for Identifying Multilingual Check-worthy Claims

2021-09-19 · Ipek Baris Schlicht, Angel Felipe Magnossão de Paula, Paolo Rosso

Identifying check-worthy claims is often the first step of automated fact-checking systems. Tackling this task in a multilingual setting has been understudied. Encoding inputs with multilingual text representations could…

Fact Checking Language Identification

CheckThat! at CLEF 2020: Enabling the Automatic Identification and Verification of Claims in Social Media

2020-01-21 · Alberto Barron-Cedeno, Tamer Elsayed, Preslav Nakov, Giovanni Da San Martino 외

We describe the third edition of the CheckThat! Lab, which is part of the 2020 Cross-Language Evaluation Forum (CLEF). CheckThat! proposes four complementary tasks and a related task from previous lab editions, offered i…

Fact Checking Task 2

Overview of the CLEF-2019 CheckThat!: Automatic Identification and Verification of Claims

2021-09-25 · Tamer Elsayed, Preslav Nakov, Alberto Barrón-Cedeño, Maram Hasanain 외

We present an overview of the second edition of the CheckThat! Lab at CLEF 2019. The lab featured two tasks in two different languages: English and Arabic. Task 1 (English) challenged the participating systems to predict…

Claim Verification Fact Checking Learning-To-Rank Task 2

Overview of the CLEF--2021 CheckThat! Lab on Detecting Check-Worthy Claims, Previously Fact-Checked Claims, and Fake News

2021-09-23 · Preslav Nakov, Giovanni Da San Martino, Tamer Elsayed, Alberto Barrón-Cedeño 외

We describe the fourth edition of the CheckThat! Lab, part of the 2021 Conference and Labs of the Evaluation Forum (CLEF). The lab evaluates technology supporting tasks related to factuality, and covers Arabic, Bulgarian…

Fact Checking Task 2

AKCIT-FN at CheckThat! 2025: Switching Fine-Tuned SLMs and LLM Prompting for Multilingual Claim Normalization

2025-09-15 · Fabrycio Leite Nakano Almada, Kauan Divino Pouso Mariano, Maykon Adriell Dutra, Victor Emanuel da Silva Monteiro 외 arxiv

Claim normalization, the transformation of informal social media posts into concise, self-contained statements, is a crucial step in automated fact-checking pipelines. This paper details our submission to the CLEF-2025 C…