A software development company is building a new feature that uses a large language model to analyze and answer questions about entire legal contracts, which can be hundreds of pages long. They are considering two different models. Model A has an extremely large context window, capable of holding the entire contract, but is very slow and expensive to run. Model B has a much smaller context window, is faster and cheaper, but would require the contract to be broken into chunks. Analyze the trade-offs between these two approaches, specifically explaining which challenges of long-context processing each model attempts to mitigate and which challenges it might introduce or exacerbate.