# Researchers release BILAL-BENCH to test Bengali AI models’ Islamic text fabrication

Digest AI · Research · published 2026-11-02T05:00:00Z

Canonical: https://digestai.news/story/researchers-release-bilal-bench-to-test-bengali-ai-models-islamic-text

## Summary

A new benchmark called **BILAL-BENCH** tests how open-source AI models generate fabricated Islamic texts in Bengali. Published on arXiv, it includes 240 expert-verified questions covering Qur’anic verses, hadiths, legal rulings, and modern issues. The benchmark evaluates seven open-weight models—ranging from 1 billion to 120 billion parameters—on 1,680 double-annotated responses, scoring them on source accuracy and confidence in claims.

The results show alarming trends: six of the seven models fabricated responses on **79.3% to 95.3%** of source-production questions. Hadith provenance was the weakest category, with only **2 of 315 responses** correct and properly sourced. Even models with the same size (8B BanglaLLaMA variants) exhibited different error patterns. Notably, models varied widely in whether they avoided unsupported claims—abstention rates ranged from **6 to 46 responses**—but this did not correlate with model size.

## Key points

- BILAL-BENCH tests Bengali AI models’ fabrication of Islamic texts with 240 expert-verified questions
- Six of seven models fabricated responses on 79.3%–95.3% of source-production questions, per double-annotated data
- Hadith provenance was the weakest category: only 2 of 315 responses were correct and properly sourced

## Why it matters

This benchmark highlights how open-source AI models may misrepresent sacred texts, undermining trust in AI-generated content for religious or legal contexts. It also shows that model size alone doesn’t guarantee accuracy in specialized domains.

## Sources

1. [Do Open Language Models Invent Scripture? BILAL-BENCH: Benchmarking Islamic-Source Fabrication in Bengali](https://arxiv.org/abs/2610.40996) (arXiv cs.CL, 2026-11-02, primary source)

## Cite

Digest AI, "Researchers release BILAL-BENCH to test Bengali AI models’ Islamic text fabrication", 2 November 2026, https://digestai.news/story/researchers-release-bilal-bench-to-test-bengali-ai-models-islamic-text

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