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LangChain LCEL Pipeline Initialization
Linked challenge: AI-Driven Mortgage Prepayment Shock Forecasting System using LangChain & Claude 4 Opus
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Build a LangChain LCEL chain using `ChatAnthropic(model='claude-3-opus-20240229')` (or Claude 4 Opus equivalent) and `JsonOutputParser`. Pass mortgage coupon, WAC, and rate delta parameters to output predicted CPR percentage.