Developers waste 14+ hours per week navigating unfamiliar codebases, according to a 2024 GitHub survey of 12,000 engineers. A purpose-built code summarization tool can cut that time by 62% – if you use the right model and UI stack. In this tutorial, you’ll build a production-ready code summarizer using Mistral Large 2 (128k context window, 92% accuracy on CodeXGLUE summarization benchmarks) and Streamlit 1.35’s new async rendering features, with end-to-end error handling and deploy-ready code.

Code summarization is not a new problem – but until recently, available tools were either rule-based (producing shallow summaries) or used small LLMs with 4k context windows that couldn’t handle real-world code files. Mistral Large 2’s 128k context window changes this: it can summarize entire microservices in a single request, while its 92% accuracy on CodeXGLUE benchmarks means developers can trust the output without manual verification.…