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Character AI

by Character.AI (Google investment)

System Card

OrganizationCharacter.AI (Google investment)
Released2022-09
Architectureepisodic-buffer / Character-Scoped Conversational Context
DetailsCharacter.AI launched in September 2022, founded by ex-Google LaMDA engineers Noam Shazeer and Daniel De Freitas. The platform hosts millions of user-created AI characters with individual conversational personas. Memory is scoped per character-user session with conversation history accessible within a session; long-term cross-session memory has historically been a known limitation versus competitors. The underlying model is proprietary and optimized for engaging, creative, character-faithful responses at massive scale.
Parameters—
Domainpersonalizationepisodic-session
Open SourceNo
WebsiteVisit
companionroleplaycharacter-creationconversationalcreativesocial-ai

Capability Profile

Benchmark Scores

5 of 14 benchmarks
Data Transparency:5 estimated
Long-Context Retrieval
0/5
RULER
no data
NIAH
no data
LooGLE
no data
LongBench
no data
∞Bench
no data
Multi-Turn Recall
2/2
LoCoMo
71.729pEstimated
MemoryBank
8593pEstimated
Cross-Session Memory
1/1
LongMemEval
77.561pEstimated
Multi-Hop QA
0/3
BABILong
no data
MultiHop-RAG
no data
HotpotQA
no data
Agent Task Memory
1/1
AgentBench-Mem
7226pEstimated
Personalization
1/1
PerLTQA
82.864pEstimated
Factuality / Grounding
0/1
RAGAS
no data
Sources:Arena estimate — derived from capability profile, not independently verified