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Compare the evidence.
Separate dated Lians measurements from current, documented product capabilities. This is an inspectable evaluation surface, not an independent vendor leaderboard.
Recall quality · LOCOMO · run 2026-07-09
Run the public test.
Recall quality · LongMemEval-S · run 2026-07-12
Publish the gap.
Capability map · source-verified August 1, 2026
Compare the same evidence.
Temporal memory is no longer unique. The meaningful test is whether a system can reconstruct a named decision at both event-time and knowledge-time cutoffs, enumerate included and excluded source versions, detect future leakage, and verify a portable receipt.
| System | Publicly documented strength | Question for a live bake-off | Primary source |
|---|---|---|---|
| Lians | Dual-time reconstruction, supersession, leak checks, Evidence Packs, crypto-erasure certificates. | Can the receipt prove exactly which source versions were knowable and excluded at both cutoffs? | Open source ↗ |
| Zep / Graphiti | Bitemporal knowledge graph and episode provenance. | Can one portable artifact bind a decision, dual cutoffs, exclusions, erasure state, and integrity proof? | Graphiti ↗ |
| Mem0 | Temporal reasoning, as-of queries, memory history, and a broad integration ecosystem. | Can the replay prove no post-cutoff source influenced the decision and verify that proof offline? | Temporal reasoning ↗ |
| Hindsight | Query-time temporal recall, history and curation, audit controls, and OpenTelemetry. | Can an exported receipt enumerate included and excluded source versions and survive crypto-erasure? | Recall API ↗ |
| Supermemory | Content versioning, temporal graph memory, connectors, and multimodal ingestion. | Can a reviewer replay the exact decision boundary and verify its chain without trusting the UI? | Graph memory ↗ |
| Letta | A full stateful-agent runtime with editable memory blocks and an agent development environment. | Does the use case need a complete agent runtime, or a narrower evidence layer around an existing stack? | Memory blocks ↗ |
Why audit matters
Storage is not the moat.
Mem0 brings a mature ecosystem and temporal reasoning. Test the compound Lians boundary: dual cutoffs, source exclusions, leak detection, and an offline-verifiable receipt.
vs Zep / GraphitiGraphiti brings a bitemporal knowledge graph and episode provenance. Compare the end-to-end decision envelope, erasure proof, and portable verification path.
vs LettaLetta is a broader stateful-agent runtime. Lians is the narrower choice when an existing agent stack needs governed historical reconstruction and evidence.
vs HindsightHindsight documents temporal recall, history, audit controls, and observability. Put source exclusions, leak checks, erasure, and receipt portability into the live test.
vs SupermemorySupermemory brings connectors, multimodal ingestion, versioning, and a temporal graph. Compare exact decision replay and offline chain verification.