Ask HN: ChatGPT Misses Major Updates?

As someone working with LLMs, I’ve noticed an interesting gap around knowledge cutoffs and "recent" feature support. For example, GitHub introduced LaTeX math rendering in Markdown in May 2022. Despite a 2023 knowledge cutoff, some models like GPT-4o don’t seem aware of this change, while others like Claude 3.5 Sonnet do recognize it but defer to outdated information if cross-referenced with another model.

Why would a model trained with data up to 2023 overlook a significant update on a widely-used platform like GitHub? Could it reflect selective data filtering during training, limitations on incorporating certain types of updates post-cutoff, or perhaps something specific to how different LLMs process and prioritize technical information?

What are your thoughts?