LITMUS++ : An Agentic System for Predictive Analysis of Low-Resource Languages Across Tasks and Models

Avni Mittal, Shanu Kumar, Sandipan Dandapat, Monojit Choudhury


Abstract
We present LITMUS++, an agentic system for predicting language-model performance for queries of the form “How will a Model perform on a Task in a Language?”, a persistent challenge in multilingual and low-resource settings, settings where benchmarks are incomplete or unavailable. Unlike static evaluation suites or opaque LLM-as-judge pipelines, LITMUS++ implements an agentic, auditable workflow: a Directed Acyclic Graph of specialized Thought Agents that generate hypotheses, retrieve multilingual evidence, select predictive features, and train lightweight regressors with calibrated uncertainty. The system supports interactive querying through a chat-style interface, enabling users to inspect reasoning traces and cited evidence. Experiments across six tasks and five multilingual scenarios show that LITMUS++ delivers accurate and interpretable performance predictions, including in low-resource and unseen conditions. Code is available at https://github.com/AvniMittal13/litmus_plus_plus.
Anthology ID:
2025.ijcnlp-demo.6
Volume:
Proceedings of The 14th International Joint Conference on Natural Language Processing and The 4th Conference of the Asia-Pacific Chapter of the Association for Computational Linguistics: System Demonstrations
Month:
December
Year:
2025
Address:
Mumbai, India
Editors:
Xuebo Liu, Ayu Purwarianti
Venue:
IJCNLP
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Publisher:
Association for Computational Linguistics
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Pages:
47–54
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URL:
https://preview.aclanthology.org/ingest-ijcnlp-aacl/2025.ijcnlp-demo.6/
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Cite (ACL):
Avni Mittal, Shanu Kumar, Sandipan Dandapat, and Monojit Choudhury. 2025. LITMUS++ : An Agentic System for Predictive Analysis of Low-Resource Languages Across Tasks and Models. In Proceedings of The 14th International Joint Conference on Natural Language Processing and The 4th Conference of the Asia-Pacific Chapter of the Association for Computational Linguistics: System Demonstrations, pages 47–54, Mumbai, India. Association for Computational Linguistics.
Cite (Informal):
LITMUS++ : An Agentic System for Predictive Analysis of Low-Resource Languages Across Tasks and Models (Mittal et al., IJCNLP 2025)
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https://preview.aclanthology.org/ingest-ijcnlp-aacl/2025.ijcnlp-demo.6.pdf