Spellbook is built on state-of-the-art LLMs including GPT-5 and Anthropic's Claude Opus, fine-tuned for commercial legal work. The platform integrates as a Microsoft Word add-in and connects to upstream intake channels such as Slack, Salesforce, and email. Its core modules include Review (AI redlining against playbooks), Draft (clause and document generation from precedents), Ask (citation-backed Q&A), Market Compare (benchmarking against thousands of real agreements), and Associate (a multi-document AI agent for complex research and review pipelines). Data privacy is enforced via Zero Data Retention agreements, and the platform is SOC 2 Type II, HIPAA, GDPR, CCPA, PIPEDA, and EU AI Act compliant.