CoCounsel Legal (Thomson Reuters)
https://legal.thomsonreuters.com/en/products/cocounsel-legal
Next-gen release (Aug 2026, built on Claude Agent SDK) is fully agentic and adds per-matter Workspaces that keep firm documents and precedents as context across matters and teams, plus Brief Builder, a Word drafting agent and Deep Research Verify.
Active · Verified 2026-10-29 · fresh as of 2026-10-29 · 32 cited facts, 7 with a third-party source · 2 recorded changes · Suggest a correction
At a glance
- Type
- Session-scoped agentic context third-party fix
- Tier
- T2
- Created
- 2013 (Casetext founded 2013; CoCounsel product launched 2023; acquired by Thomson Reuters Aug 2023 for $650M) third-party fix
- Latest release
- not applicable — not OSS fix
- License
- not applicable — not OSS fix
- GitHub
- not applicable — no GitHub repo fix
- Pricing
- searched not found fix
- Funding
- Public company (Thomson Reuters) vendor fix
- Freshness
- 2026-10-29 fix
- Layer
- agent-infra repo fix
- Licensing
- commercial vendor fix
Memory 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
- Managed SaaS; GA in US, Canada/UK/Australia slated for later 2026
- Embedding model
- searched not found
- Multi-tenancy
- searched not found
- MCP
- yes — first-party CoCounsel Legal MCP connector for Claude (May 2026, expanded Aug 2026); AWS MCP connection announced
- A2A
- no A2A protocol support advertised — vertical product, no A2A integration documented
- OpenTelemetry
- no OpenTelemetry integration advertised — vendor logs/observability not publicly documented
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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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- ASAPP GenerativeAgent T1
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- BenevolentAI T1
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- Causaly T1
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Sources (31 cited facts, 7 third-party)
Each fact links to the page it came from; the badge says who published it (how to read sources).
- What it is Session-scoped agentic context third-party
- What it does & what's distinct Next-gen release (Aug 2026, built on Claude Agent SDK) is fully agentic and adds per-mat… vendor
- Claims / benefits 1M users across 107 countries. vendor
- Modalities text vendor
- Created 2013 (Casetext founded 2013; CoCounsel product launched 2023; acquired by Thomson Reuter… third-party
- Funding Public company (Thomson Reuters) vendor
- Customers / scale 1M users across 107 countries vendor
- Deployment Managed SaaS; GA in US, Canada/UK/Australia slated for later 2026 vendor
- Founders / pedigree Thomson Reuters (public company) vendor
- Memory volume / scale internal — undisclosed (1M users 107 countries) vendor
- Encryption At-rest + in-transit (private eyes-off processing); SOC 2 + ISO 27001; no cross-client c… third-party
- Consistency strong consistency (legal accuracy requirement) vendor
- Versioning matter-versioned (per-matter document history) vendor
- Tombstoning matter-closure soft delete + privilege-log retention vendor
- Schema evolution schema with migration third-party
- Namespace primitives matter-per-tenant + firm-tenant (ethical-wall isolation) vendor
- Contradiction handling lawyer-in-the-loop reconciliation; auditor flags vendor
- Forgetting policy matter-retention policy (firm-defined; commonly 7-10 years post-matter-close per state b… vendor
- MCP support yes — first-party CoCounsel Legal MCP connector for Claude (May 2026, expanded Aug 2026)… vendor
- Validated verticals legal (BigLaw, plaintiff litigation, in-house, transactional, contracts) vendor
- Time to running <1week to weeks-to-months (firm procurement + matter integration) vendor
- Anti-fit not for non-legal verticals; not for self-represented litigants vendor
- Optimised for matter-scoped privilege + audit + firm-precedent memory vendor
- Adjacent infrastructure requires DMS / case-management integration + identity provider vendor
- Pros Backed by Thomson Reuters' Westlaw + Practical Law corpus — most authoritative legal-mem… third-party
- Cons Enterprise pricing; Thomson Reuters lock-in; less developer-API-friendly. third-party
- Project & sources CoCounsel third-party
- architecture-deployment-locus cloud vendor
- licensing-bucket commercial vendor
- positioning-platform-vs-product product vendor
- taxonomy-three-layer-rollup agent-infra repo
What changed
Changes to this record's lifecycle, licence, release, pricing and hosting facts, from the catalog's git history. Subscribe (Atom)
- 2026-10-29
- Homepage “https://legaltechnology.com/2025/08/05/thomson-reuters-launches-cocounsel-legal-with-agentic-ai-and-deep-research-capabilities/” → “https://legal.thomsonreuters.com/en/products/cocounsel-legal”
- 2026-10-22
- Deployment first recorded as “Managed SaaS; GA in US, Canada/UK/Australia slated for later 2026” source
- MCP support first recorded as “yes — first-party CoCounsel Legal MCP connector for Claude (May 2026, expanded Aug 2026); AWS MCP connection announced” source
Related systems
References (2)
- Anthropic Claude (foundation models) depends on at runtime — Next-gen release (Aug 2026, built on Claude Agent SDK) is fully agentic and adds per-matter Workspaces that keep firm documents and precedents as context across matters and teams, plus Brief Builder…
- Claude Agent SDK builds on — Next-gen release (Aug 2026, built on Claude Agent SDK) is fully agentic and adds per-matter Workspaces that keep firm documents and precedents as context across matters and teams, plus Brief Builder…