New Memory Retrieval System Achieves #1 on LongMemEval Using Gemini Flash

An experimental memory retrieval system took the #1 spot on the LongMemEval benchmark, scoring 96.4% (top-50) using Gemini 3 Flash. This result surpasses existing models using Gemini 3 Pro (Mem0 94.8%, Honcho 92.6%, HydraDB 90.79%, etc.).

The research intentionally used the smaller Flash model in order to independently evaluate Retrieval Quality rather than the capability of the model itself.

Key Design Features:

• Query decomposition: Performs parallel retrieval targeting different information needs in order to capture all information required from multi-session questions.
• Temporal salience scoring: Scores candidates by combining semantic similarity, lexical precision, and temporal salience.
• Coherence re-ranking: Re-ranks results by considering coherence and temporal flow between memories before passing them to the answering model.

Performance by Category (top-50):

• Single-session (User): 98.6%
• Assistant: 100%
• Preferences: 96.7%
• Knowledge Update: 97.4%
• Multi-session: 94.0%
• Temporal Reasoning: 95.5%