Head to head

Luminance vs Spellbook

Luminance (Luminance) and Spellbook (Spellbook) both sit in Legal. Every value below comes from the latest crawl of the vendors' own pages.

Attribute	Luminance Luminance	Spellbook Spellbook
Segment	Legal	Legal
Version	Luminance Platform	ACM
Entry cost	Pricing is not publicly listed. Contact Luminance to request a demo and custom quote.	Custom pricing structured around the number of team members. Offers a 7-day free trial.
Pricing tiers	Enterprise free	Law Firms (Spellbook Suite) free · In-House Teams (Spellbook Suite) free
Model stack	Luminance legal models · Luminance Mixture of Experts · Luminance proprietary legal models · Luminance Proprietary Models · Luminance specialist legal models · Multiple Models / Mixture of Experts · Panel of legal models · Proprietary Legal AI Models · Proprietary Legal LLM · Proprietary Legal LLMs · proprietary legal models · Proprietary Legal-Grade AI Architecture · Proprietary Mixture of Experts (MoE) · specialist legal models	GPT5 · Opus
Context window	Not published	Not published
Public API
Routes models
Changes / 30d	5	5
Origin	Global	Global
Capabilities	Automated redlining, Contract negotiation, Repository analysis, Divergence detection, Contract Generation, Contract Negotiation, Contract Analysis, Compliance Monitoring	Clause suggestions, Redlining, Risk flagging, Benchmarks, Playbooks, Contract Review, Contract Drafting, Contract Comparison

Luminance

Reviews and negotiates contracts using purpose-trained legal models.

Suggests clauses, flags risk and redlines contracts inside Microsoft Word.