Worked on the infiniflow/ragflow repository to expand the OpenAI model catalog by adding GPT-5.5 and GPT-5.4, making these models available through both the user interface and the /llm/list API. Leveraged Python for API development and configuration management, ensuring catalog definitions were synchronized across multiple configuration files to maintain consistency. Extended automated test coverage by updating unit tests and introducing response-level assertions to validate the inclusion of new models. Established an isolated test environment and executed targeted and full test suites using pytest, focusing on minimizing risk and ensuring forward compatibility while aligning catalog configurations with seeded database entries.