Mem0
“Mem0 solved one of the genuinely hard problems in the AI stack — persistent context that survives session boundaries and scales across agents without turning every conversation into a 50,000-token slideshow. Y Combinator loved it, developers are actually using it, and the technical benchmarks are real. The comedy is that they built the perfect memory layer just in time for ChatGPT o1 to remember everything natively, and Claude to announce 'persistent conversations' as a platform feature that ships with no integration required.”