CoCounsel vs Spellbook
55 fields both were evaluated on, 25 of them different — including where one discloses something the other does not. Every value links to the document it came from. 30 further fields are disclosed by neither and are listed at the end rather than tabled.
Assurance
| Field | CoCounsel | Spellbook |
|---|---|---|
| Audit trail· | no public information www.thomsonreuters.com · checked Aug 1, 2026 | audit controls “Plus we have the SSO, MFA, encryption, and audit controls your security team will ask about.”spellbook.com · checked Aug 6, 2026 |
| Explainability· | no public information www.thomsonreuters.com · checked Aug 1, 2026 | |
| Runtime governance· | “We have developed and implemented prompting "guardrails," ensuring our GenAI-based products will only produce responses from content drawn from a clearly defined and limited set of verified information, such as our own content databases. This practice restricts the large language model's ability to produce potentially objectionable content broadly sourced from the internet.”www.thomsonreuters.com · checked Aug 1, 2026 | no public information spellbook.com · checked Aug 6, 2026 |
| Permission scopes· | “Retention of user content and prompts is customized to fit customer needs and set up at the organization account level with the support of a Thomson Reuters client manager.”www.thomsonreuters.com · checked Aug 1, 2026 | no public information spellbook.com · checked Aug 6, 2026 |
| Compliance certifications· | no public information www.thomsonreuters.com · checked Aug 1, 2026 | |
| Regulatory alignment· | no public information www.thomsonreuters.com · checked Aug 1, 2026 |
Agency
| Field | CoCounsel | Spellbook |
|---|---|---|
| Human oversight· | “Fiduciary‑Grade AI is designed to support human judgment, not replace it. Professionals remain responsible for the advice they give, the decisions they make, and the work they sign off on.”www.thomsonreuters.com · checked Aug 1, 2026 | no public information spellbook.com · checked Aug 6, 2026 |
| Goal complexity· | “Accelerate legal, tax, audit, compliance, and drafting work with purpose-built AI grounded in authority, transparency, and trust”www.thomsonreuters.com · checked Aug 1, 2026 | no public information spellbook.com · checked Aug 6, 2026 |
| Action space· | “Connected to the tools you already use, including Westlaw, Practical Law, Checkpoint, Microsoft 365, and document management system partners”www.thomsonreuters.com · checked Aug 1, 2026 | no public information spellbook.com · checked Aug 6, 2026 |
| Operating environment· | “Connected to the tools you already use, including Westlaw, Practical Law, Checkpoint, Microsoft 365, and document management system partners”www.thomsonreuters.com · checked Aug 1, 2026 | no public information spellbook.com · checked Aug 6, 2026 |
Safety
| Field | CoCounsel | Spellbook |
|---|---|---|
| Safety policy· | no public information www.thomsonreuters.com · checked Aug 1, 2026 | “Zero data retention means our LLM providers never learn from, train on, or store your data. Plus we have the SSO, MFA, encryption, and audit controls your security team will ask about.”spellbook.com · checked Aug 6, 2026 |
| Usage restrictions· | “CoCounsel is not a replacement for outside counsel when the stakes are high”www.thomsonreuters.com · checked Aug 1, 2026 | no public information spellbook.com · checked Aug 6, 2026 |
| Data handling· | no public information www.thomsonreuters.com · checked Aug 1, 2026 | “Zero data retention means our LLM providers never learn from, train on, or store your data.”spellbook.com · checked Aug 6, 2026 |
Practicality
| Field | CoCounsel | Spellbook |
|---|---|---|
| Availability· | no public information www.thomsonreuters.com · checked Aug 1, 2026 | |
| Deployment options· | “We process all interactions with OpenAI GPT and Google Gemini in the U.S. We host backup data in separate availability time zones in the U.S.* *Region-based hosting is available in the UK, Australia, and Canada.”www.thomsonreuters.com · checked Aug 1, 2026 | Works inside Word and Google Docs, in addition to a standalone product. “Works in Word and Google Docs”spellbook.com · checked Aug 26, 2026 |
| Integrations· | “Connected to the tools you already use, including Westlaw, Practical Law, Checkpoint, Microsoft 365, and document management system partners”www.thomsonreuters.com · checked Aug 1, 2026 | email, Slack, Salesforce “New contracts come in from email, Slack, Salesforce”spellbook.com · checked Aug 6, 2026 |
| Supported regions· | “Region-based hosting is available in the UK, Australia, and Canada.”www.thomsonreuters.com · checked Aug 1, 2026 | 80+ countries. We comply with GDPR, CCPA, PIPEDA and numerous other privacy standards. “We serve 4,500 teams in 80+ countries. We comply with GDPR, CCPA, PIPEDA and numerous other privacy standards.”spellbook.com · checked Aug 6, 2026 Not in our latest capture. We captured this page again on Sep 16, 2026 and this quote was not there. How we re-check citations |
Foundation models
| Field | CoCounsel | Spellbook |
|---|---|---|
| Base models· | “We process all interactions with OpenAI GPT and Google Gemini in the U.S.”www.thomsonreuters.com · checked Aug 1, 2026 | GPT5 and Opus “tuned for commercial legal work, and powered by state-of-the-art LLMs like GPT5 and Opus.”spellbook.com · checked Aug 6, 2026 |
| Model provider· | “We process all interactions with OpenAI GPT and Google Gemini in the U.S.”www.thomsonreuters.com · checked Aug 1, 2026 | no public information spellbook.com · checked Aug 6, 2026 |
Ecosystem
| Field | CoCounsel | Spellbook |
|---|---|---|
| Tool use· | “Connected to the tools you already use, including Westlaw, Practical Law, Checkpoint, Microsoft 365, and document management system partners”www.thomsonreuters.com · checked Aug 1, 2026 | no public information spellbook.com · checked Aug 6, 2026 |
| Multi-agent· | no public information www.thomsonreuters.com · checked Aug 1, 2026 | “Associate The AI agent for multi-document drafting and review”spellbook.com · checked Aug 6, 2026 |
Impact
| Field | CoCounsel | Spellbook |
|---|---|---|
| User base· | no public information www.thomsonreuters.com · checked Aug 1, 2026 | 4,500+ legal teams “Trusted by 4,500+ legal teams”spellbook.com · checked Aug 6, 2026 Not in our latest capture. We captured this page again on Sep 16, 2026 and this quote was not there. How we re-check citations |
| Deployment scale· | no public information www.thomsonreuters.com · checked Aug 1, 2026 | “We serve 4,500 teams in 80+ countries.”spellbook.com · checked Aug 6, 2026 Not in our latest capture. We captured this page again on Sep 16, 2026 and this quote was not there. How we re-check citations |
| Target sectors· | “Legal professionals Tax professionals Audit professionals Accounting professionals”www.thomsonreuters.com · checked Aug 1, 2026 | in-house teams and law firms “Designed for in-house teams and law firms”spellbook.com · checked Aug 6, 2026 |
| High-risk domains· | “Fiduciary‑Grade AI is designed for professional work where outputs may influence legal judgments, financial disclosures, regulatory filings, compliance decisions, or client advice.”www.thomsonreuters.com · checked Aug 1, 2026 | in-house teams and law firms “Designed for in-house teams and law firms”spellbook.com · checked Aug 6, 2026 |
Disclosed by neither
Both CoCounsel and Spellbook publish nothing on these 30 fields. That is a finding about the category rather than a difference between them, so it is recorded here instead of as 30 identical table rows. Each is shown with its source check on the individual profiles.
- Autonomy level
- Initiative
- Documented incidents
- Pricing model
- Price point
- Support model
- Model swappable
- Open weights
- Fine-tuning
- Context window
- Protocols supported
- API access
- Open source
- Marketplace presence
- Safety evaluations
- Red teaming
- Model or system card
- Incident reporting
- Third-party evaluations
- Insurance available
- Insurance carriers
- Coverage limits
- Indemnification
- Liability cap
- Tamper-evident log
- Outcome-based pricing
- Settlement mechanism
- Dispute process
- SLA terms
- Evaluation coverage
Questions
- How do CoCounsel and Spellbook compare on user base?
- CoCounsel: no public information disclosed. Spellbook: 4,500+ legal teams.
- How do CoCounsel and Spellbook compare on audit trail?
- CoCounsel: no public information disclosed. Spellbook: audit controls.