Sustainability LLM is a large language model built to verify the accuracy, completeness, and credibility of corporate ESG disclosures. The system analyzes environmental, social, and governance reports to detect inconsistencies, unsupported claims, missing compliance data, and potential greenwashing. It then generates clear, actionable feedback that explains what is incorrect, why it matters, and how companies can correct or improve their reporting. By combining domain-specific knowledge with advanced text reasoning, Sustainability LLM supports transparent sustainability reporting and reduces the cost and bias of manual ESG audits—empowering organizations to produce trustworthy, standards-aligned disclosures at scale.