Originally published on rohitraj.tech
Agent memory — not the model — is the 2026 bottleneck. MemPalace just hit 54.1k GitHub stars and shipped v3.4.0 with a 96.6% LongMemEval score and zero API calls. Here's how the four open-source AI agent memory layers (Mem0, Zep, Letta, MemPalace) actually compare on architecture, real benchmarks, and honest licensing — plus a code snippet to add memory in minutes and how I'd wire it into a production agent.
Read the full version with code samples, diagrams, and architecture details: AI Agent Memory in 2026: Mem0 vs Zep vs Letta vs MemPalace (Open-Source, Benchmarked)
More engineering notes: rohitraj.tech/en/notes
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