In January 2026, Gregor Thielebein developed token-based code splitting functionality for the run-llama/llama_index repository, focusing on enhancing scalability and precision when processing large codebases. He introduced new parameters for token counting, maximum token limits, and customizable tokenization, while ensuring backward compatibility with existing character-based chunking. His work included internal improvements to chunk size calculations and expanded test coverage, along with practical usage examples to demonstrate the new features. Utilizing Python for back end development and unit testing, Gregor delivered a well-structured feature that addressed performance and developer productivity, reflecting a thoughtful and thorough engineering approach within the project.