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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 benchmarksLong-Context Retrieval0/5
RULER
no dataNIAH
no dataLooGLE
no dataLongBench
no data∞Bench
no dataMulti-Turn Recall2/2
Cross-Session Memory1/1
Multi-Hop QA0/3
BABILong
no dataMultiHop-RAG
no dataHotpotQA
no dataAgent Task Memory1/1
Personalization1/1
Factuality / Grounding0/1
RAGAS
no dataSources:Character AI vendor documentation; evaluated on LoCoMo: Long-Term Conversational Memory Benchmark (Snap Research, 2402)Character AI vendor documentation; evaluated on LongMemEval: Benchmarking Chat Assistants on Long-Term Interactive Memory (Salesforce AI Research, 2410)Character AI vendor documentation; evaluated on MemoryBank: Enhancing LLMs with Long-Term Memory (Sun Yat-sen University, 2305)Character AI vendor documentation; evaluated on AgentBench Memory Track (Tsinghua KEG, 2308)Character AI vendor documentation; evaluated on PerLTQA: A Personal Long-Term Memory Question Answering Dataset (PolyU, 2402)