CoCounsel Legal (Thomson Reuters)
Aug 2025 relaunch added agentic deep-research workflows (plan-execute-cite). Holds context within a session; no persistent cross-session matter memory layer publicly documented yet. Thomson is building proprietary "Thomson" legal LLM for summer 2026.
At a glance
- Type
- Session-scoped agentic context
- Tier
- T2
- Created
- 2013 (Casetext founded 2013; CoCounsel product launched 2023; acquired by Thomson Reuters Aug 2023 for $650M)
- Latest release
- not applicable — not OSS
- License
- not applicable — not OSS
- GitHub
- not applicable — no GitHub repo
- Pricing
- searched not found
- Funding
- Public company (Thomson Reuters)
Taxonomy
- storage
- vector
- retrieval
- similarity
- persistence
- session
- update
- overwrite
- unit
- document
- governance
- auditable
- conflict
- none
When to use
Optimised for: matter-scoped privilege + audit + firm-precedent memory
Anti-fit: not for non-legal verticals; not for self-represented litigants
Pros & cons
Pros
Backed by Thomson Reuters' Westlaw + Practical Law corpus — most authoritative legal-memory substrate.
Cons
Enterprise pricing; Thomson Reuters lock-in; less developer-API-friendly.
Claims & capabilities
1M users across 107 countries.
Technical surface
- API surface
- searched not found
- Backend storage
- searched not found
- Deployment
- searched not found
- Embedding model
- searched not found
- Multi-tenancy
- searched not found
- MCP
- no MCP support advertised — vertical product, no MCP server / client integration documented
- A2A
- no A2A protocol support advertised — vertical product, no A2A integration documented
- OpenTelemetry
- no OpenTelemetry integration advertised — vendor logs/observability not publicly documented
Similar systems
Other vertical / domain-specific ai memory in the catalog, ranked by inbound references.
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- Abridge T1
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