ResearchBenchmarksNeedle-In-A-Haystack Retrieval on NIAH Single 2For AI assistantsMarkdownContent indexNeedle-In-A-Haystack Retrieval on NIAH Single 2Follow94Success Rate (4K Context)StateX82.5685.5388.591.47Sep 26, 2025Evaluation resultsMethodMethodLinksSuccess Rate (4K Context)Success Rate (8K Context)Success Rate (16K Context)Success Rate (32K Context)StateXArchitecture=Mamba2Architecture=Mamba22025.099461329VanillaArchitecture=Mamba2Architecture=Mamba22025.098343309