Head to head

Spellbook vs Luminance

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

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

Spellbook

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

Reviews and negotiates contracts using purpose-trained legal models.