Knowledge graph architecture where facts have validity windows showing when they became true and were superseded. Core component of Zep AI's Graphiti and other agent memory systems.
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Temporal Knowledge Graphs extend traditional knowledge graphs by tracking how facts change over time, with each fact having explicit time metadata showing its validity period.
Zep AI's Graphiti is a temporally-aware knowledge graph engine where every fact carries explicit time metadata. When an agent records an episode, Graphiti decomposes it into entities (nodes), relationships (edges), and temporal attributes.
On LongMemEval benchmark, systems using temporal knowledge graphs like Graphiti achieved 63.8% with GPT-4o, showing strong improvements in temporal reasoning.
Concept/architecture, Graphiti open-source.