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H2O

by UT Austin / Rice / CMU / Stanford / Meta (Zhang et al.)

System Card

OrganizationUT Austin / Rice / CMU / Stanford / Meta (Zhang et al.)
Released2023-06
Architecturekv-cache-extension / Dynamic KV eviction of non-Heavy-Hitter tokens
DetailsFrames KV cache eviction as a dynamic submodular problem with theoretical guarantees. Retains a balance of recent tokens and "heavy hitters" (high attention-score accumulators), evicting the rest to shrink the cache.
Parameters—
Domainlong-context
Open SourceYes
PaperView Paper
CodeRepository
neurips-2023kv-evictionheavy-hitterthroughput

Capability Profile

Benchmark Scores

6 of 14 benchmarks
Data Transparency:6 estimated
Long-Context Retrieval
5/5
RULER
74.477pEstimated
NIAH
76.169pEstimated
LooGLE
75.941pEstimated
LongBench
603pEstimated
∞Bench
76.225pEstimated
Multi-Turn Recall
0/2
LoCoMo
no data
MemoryBank
no data
Cross-Session Memory
0/1
LongMemEval
no data
Multi-Hop QA
1/3
BABILong
73.941pEstimated
MultiHop-RAG
no data
HotpotQA
no data
Agent Task Memory
0/1
AgentBench-Mem
no data
Personalization
0/1
PerLTQA
no data
Factuality / Grounding
0/1
RAGAS
no data
Sources:Arena estimate — derived from capability profile, not independently verified