MemPalace

The highest-scoring AI memory system ever benchmarked. And it's free.

Every conversation you have with an AI — every decision, every debugging session, every architecture debate — disappears when the session ends. Six months of work, gone. You start over every time.

Other memory systems try to fix this by letting AI decide what's worth remembering. It extracts "user prefers Postgres" and throws away the conversation where you explained why. MemPalace takes a different approach: store everything, then make it findable.

The Palace — Ancient Greek orators memorized entire speeches by placing ideas in rooms of an imaginary building. Walk through the building, find the idea. MemPalace applies the same principle to AI memory: your conversations are organized into wings (people and projects), halls (types of memory), and rooms (specific ideas). No AI decides what matters — you keep every word, and the structure gives you a navigable map instead of a flat search index.

Raw verbatim storage — MemPalace stores your actual exchanges in ChromaDB without summarization or extraction. The 96.6% LongMemEval result comes from this raw mode. We don't burn an LLM to decide what's "worth remembering" — we keep everything and let semantic search find it.

AAAK (experimental) — A lossy abbreviation dialect for packing repeated entities into fewer tokens at scale. Readable by any LLM that reads text — Claude, GPT, Gemini, Llama, Mistral — no decoder needed. AAAK is a separate compression layer, not the storage default, and on the LongMemEval benchmark it currently regresses vs raw mode (84.2% vs 96.6%). We're iterating. See the note above for the honest status.

Local, open, adaptable — MemPalace runs entirely on your machine, on any data you have locally, without using any external API or services. It has been tested on conversations — but it can be adapted for different types of datastores. This is why we're open-sourcing it.

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Quick Start · The Palace · AAAK Dialect · Benchmarks · MCP Tools

Highest LongMemEval score ever published — free or paid.

96.6%LongMemEval R@5raw mode, zero API calls 500/500questions testedindependently reproduced $0No subscriptionNo cloud. Local only.

Reproducible — runners in benchmarks/. Full results. The 96.6% is from raw verbatim mode, not AAAK or rooms mode (those score lower — see note above).

A Note from Milla & Ben — April 7, 2026