Based only on the facts in our directory. The right pick still depends on the job you need done.
Lower starting price
Not comparable
Not comparable: Luminance does not list a price
Free plan
Tie
Neither has one
Higher rating
CoCounsel
4.3 against 4.2
Same job?
Yes
Both are Legal AI tools
Side by side
Compared on
CoCounsel
Luminance
Our rating
4.3Better
4.2
Starts at
$375/mo
Not listed
Free plan
No
No
Category
Legal AI
Legal AI
Plans
From $375/mo
See pricing
Key features
First AI legal assistant built on GPT-4, launched March 2023
Backed by Thomson Reuters after a $650M acquisition of Casetext
Multi-model architecture spanning Anthropic, OpenAI, and Google models
1 million users across 107 countries and territories by 2026
Optional integration with Thomson Reuters' Practical Law guides and templates
Proprietary LLMX model trained specifically on legal documents
Pattern-recognition engine trained on 150 million-plus legal documents
One of the earliest companies applying machine learning to legal contracts, since 2015
1,000+ organizations across 70 countries as of May 2026
Used by all Big Four consultancies and 25%+ of Global Top 100 law firms
Pros
Thomson Reuters backing brings deep legal-content integration most competitors lack
Massive user scale, 1 million users, validates broad real-world adoption
Multi-model architecture avoids dependence on one AI provider
Purpose-built legal model rather than a general-purpose LLM adapted afterward
Genuinely massive scale and blue-chip client base validate real-world reliability
Longest operating history in this category, predating the current legal-AI wave by years
Cons
Practical Law integration requires the higher-priced tier to access fully
Backed by a legacy legal publisher rather than operating as an independent AI-first startup
Entry pricing at $4,500 a year per user still represents a real budget commitment
Pricing isn't published, requires a direct sales conversation
Proprietary-model approach may iterate more slowly than platforms built on frontier LLMs
Enterprise scale and client base suggest better fit for larger organizations
Company
Thomson Reuters, founded 2023
Luminance, founded 2015
Prices come from each vendor's pricing page, last checked 20260714. Check the vendor before you buy.
FAQ
Questions people ask
Is CoCounsel better than Luminance?
In our reviews CoCounsel scores 4.3 and Luminance scores 4.2. The better pick depends on the job. CoCounsel: Reached 1 million users in 3 years, backed by Thomson Reuters after a $650M acquisition. Luminance: Trained its own proprietary LLM on more than 150 million legal documents.
CoCounsel
Luminance
