SallyIP vs Harvey vs CoCounsel vs Genie AI (2026)

Short version: Harvey and CoCounsel lead enterprise legal AI adoption. Genie AI leads accessible contract drafting. SallyIP is built for a narrower job — verifiable patent work — and publishes its measurement methodology instead of a score.

What peer-reviewed research actually says about hallucinations

General LLMs (GPT-3.5/4, Llama 2, PaLM 2): 58–88% hallucination on legal queries (Dahl et al., Stanford 2024).
Purpose-built legal RAG tools: 17–33% — Lexis+ AI ~17% (65% accurate), Westlaw AI-Assisted Research ~33% (42% accurate), CoCounsel/Practical Law ~17% with 60%+ refusals (Magesh et al., Stanford/JELS 2024–2025).
Harvey, Genie AI, Solve Intelligence, DeepIP: no public hallucination measurements. Any ranked percentages you see for them come from opinion pieces, not experiments.

Head-to-head

	Harvey	CoCounsel	Genie AI	SallyIP
Best for	Am Law 100 enterprise workflows	Westlaw-grounded research + drafting	Affordable contract drafting/review	Verifiable patent research, drafting, prosecution
Patent depth (FTO, novelty, claim charts, OA response)	Thin	Thin	None	12 specialist workspaces
Citation verification mechanics	Citations, undisclosed method	KeyCite-backed	Risk flags	Exact-quote verification + dangling-label removal, measured
Published eval methodology	No	No	No	Yes (open bench runners + frozen datasets)
Measured hallucination rate	Unpublished	~17%* (Stanford, older product)	Unpublished	0% fabricated citations / 119 answers (internal, mechanical grading)
Price direction	~$1,200/seat/mo	~$225/seat/mo bundles	From $75/mo	Freemium / self-hosted

* Thomson Reuters lineage product as tested; current CoCounsel may differ — they publish no current numbers.

Our position, plainly: if you are an Am Law 100 firm, buy Harvey or CoCounsel. If you draft everyday contracts cheaply, try Genie. If you do patent work and want every material conclusion traceable to its evidence — with the receipts published — try SallyIP.

Try SallyIP

Last updated September 2026. Corrections welcome — methodology beats marketing.