Case Study
Reinventing commercial underwriting
Results
- 8: AIG business lines using Claude¹
AIG Lexington’s Middle Market Property business, a large and fast-growing area of the company, saw:¹
- +30%: Quoted submissions
- -55%: Time-to-quote
- +40%: Submissions bound
Background
AIG is a leading global insurance organization that helps businesses and individuals in over 200 countries and jurisdictions protect their assets and manage risks. In 2023, AIG recognized that its underwriting process was slowed by the manual effort of taking in and reviewing data from insurance brokers, clients and third parties across many formats. It didn’t have the resources to review every applicable submission, which it believed represented missed opportunities for growth, so it set out to embed AI at the core of its underwriting business.
Impact
AIG collaborated with Anthropic to build workflows in a highly regulated industry. Beginning with the Claude 2.0 model, the company created Underwriting by AIG Assist with the intent to process and analyze data from every submission received in the lines of business where it is deployed. Underwriters used to spend weeks gathering data before starting a risk summary; now they can begin each review with a curated risk summary and full audit trail generated by Claude.
Where deployed, Underwriting by AIG Assist cut submission review time by more than 90% and enabled review of 100% of applicable submissions. In AIG’s Lexington Middle Market Property business, one of the company’s largest businesses in North America, Underwriting by AIG Assist enabled underwriters to review over 30% more submissions and quote them 55% faster as of March 31, 2026.
Over the last year, AIG has expanded Underwriting by AIG Assist to eight lines of business and is continuing to scale it across the company. The company also extended Claude to its claims organization. In early pilots, Claims by AIG Assist cut the time it takes AIG to respond to clients after a claim is filed from days to hours, and reduced coverage reviews from hours to minutes. Additionally, AIG is exploring providing access to Claude Code to its software engineers, deployed through Claude Enterprise together with the governance controls a regulated insurer requires.
Another area of exploration for AIG is enabling teams of purpose-built agents that could amplify what its underwriting teams can do, built and deployed with Anthropic’s help. For example, in one scenario under consideration, an agent takes in submissions and extracts data, another checks risk against underwriting guidelines, a third benchmarks pricing against portfolio targets, and a collaboration agent pulls their work together—with underwriters overseeing every decision.
- As of March 31, 2026
“The way we think about AI and the work we do with partners like Anthropic is simple: it has to create value for clients and colleagues. Every workflow we build should help our colleagues work faster, smarter and more consistently, while improving the experience and outcomes for our clients. That means better speed, sharper underwriting, more responsive claims service, faster turnaround times and greater confidence for the people and businesses we serve.”
