Tasks

• Task 1 Source Retrieval for Scientific Web Claims
• Task 2 Fact-Checking Numerical Claims
• Task 3 Generating Full Fact-Checking Articles

Registration

TBA

Important Dates

Specific dates will be announced once they are fixed.

• 17 November 2025: Lab registration opens
• December 2025: Release of the training materials
• 23 April 2026: Lab registration closes
• May 2026: Beginning of the evaluation cycle (test sets release)
• 07 May 2026: End of the evaluation cycle (run submission)
• 28 May 2026: Deadline for the submission of working notes [CEUR-WS]
• 28 May – 30 June 2026: Review process of participant papers
• 08 June 2026: Submission of Condensed Lab Overviews [LNCS]
• 15 June 2026: Notification of Acceptance for Condensed Lab Overviews [LNCS]
• 22 June 2026: Camera Ready Copy of Condensed Lab Overviews [LNCS] due
• 30 June 2026: Notification of Acceptance for Participant Papers [CEUR-WS]
• 06 July 2026: Camera Ready Copy of Participant Papers and Extended Lab Overviews [CEUR-WS] due
• 21-24 September 2026: CLEF 2026 Conference in Jena, Germany

All deadlines are 23:59 in Anywhere on Earth (AOE) timezone.

Recent Updates

• 5 Sept, 2025: website is up.

Organisers

• General:
  • Julia Maria Struß, University of Applied Sciences Potsdam, Germany
• Task 1:
  • Stefan Dietze, GESIS - Leibniz Institute for the Social Sciences, Cologne, Germany
• Task 2:
  • Vinay Setty, University of Stavanger, Norway
  • Venktesh V, Delft University of Technology, Nethderlands
• Task 3:
  • Preslav Nakov, MBZUAI, UAE
  • Tanmoy Chakraborty, IIT Delhi, India

PC chairs

• TBA

Communication chair

• TBA

Citations

TBA

CLEF 2026

This edition of the CheckThat! lab is held within CLEF 2026, part of the CLEF initiative.