{"id":8,"identifier":"LOR-00008","url":"https://lifeofresearch.com/articles/8","title":"Memory Architectures Beyond Attention: Disambiguating Four Memory Concepts and the Long-Context Reasoning Frontier","abstract":"State-space models did not merely \"open a door\" beyond attention; they walked through it. Mamba, Mamba-2, Samba,\nJamba, Granite 4, Hymba, and a growing family of hybrid attention-SSM architectures are now in production language models,\ndemonstrating that linear-time alternatives to attention can match transformers on language modelling at competitive scales.\nThe simultaneous expansion of pure-attention context windows — Gemini 1.5 and successors handling up to 10 million tokens\nwith near-perfect needle-in-haystack recall — has changed the empirical landscape that motivated SSM research in the first\nplace. The popular framing of \"memory architectures beyond attention\" has not kept up with this. This paper makes three\nclaims. First, the word \"memory\" in the long-context discussion conflates four distinct concepts — architectural state, context\nwindow, external retrieval, and persistent agent memory — each with different scaling properties and different research\nquestions. Second, the empirical picture is more nuanced than either the SSM-replaces-attention or the attention-is-enough\nframings: SSMs win on very long passive recall and inference efficiency, transformers win on complex reasoning, hybrids win\nin deployment, and the choice between them is task-dependent. Third, the genuine open frontier is reasoning at long context\n— not retrieval, which is largely solved — and benchmarks like MathHay (51% accuracy at 128K tokens for Gemini-1.5-Pro)\nmake the gap quantitatively visible. We propose a research agenda focused on architecture-task fit, hierarchical multi-scale\nmemory, and reasoning-aware long-context evaluation.","authors":[{"name":"Pranay Mahendrakar","affiliation":"","orcid":"0009-0003-7224-029X"}],"type":"article","license":"CC-BY-4.0","keywords":[],"publication_date":"2026-04-28","version":1,"views":4,"downloads":6,"created_at":"2026-09-22 17:33:43","doi":"10.5281/zenodo.19855022","source":"Zenodo","source_url":"https://zenodo.org/records/19855022","files":[{"id":8,"name":"Memory_Architectures_Beyond_Attention_Mahendrakar.pdf","size":93415,"mime":"application/pdf","downloads":6,"download_url":"https://lifeofresearch.com/articles/8/files/8/Memory_Architectures_Beyond_Attention_Mahendrakar.pdf"}]}