The use case: how Spellbook deploys Claude
Spellbook builds contract drafting, review, and management software for legal teams, using Claude-powered agents inside Microsoft Word to flag risks, negotiate terms, and draft redlines. It also uses Claude Code for its own engineering work.
More reported results
Figures published in Claude’s case study. They are not independently measured by usedby.
Runs its Claude-powered review agents across about 530,000 contracts every month
Handles more than 700,000 chat messages from practicing lawyers each month
Spellbook has grown to 5,000 customers and 250 employees, with growth accelerating after the Claude-powered features launched.
In the customer’s words
Fable calls out more important issues, and for the issues it calls out, it calls them out far more consistently than any of the other Opus modelsOther AI tools used by Spellbook
Other public relationships recorded on usedby.
Explore Spellbook’s AI stack
Claude users in Legal & Compliance
Companies in the same sector, with public evidence.
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Go straight to the source
Based on Claude’s published case study. We check the public evidence; the results are reported by the vendor.
claude.com- Last checked
- Oct 30, 2026
Open source capture What the story claims, and what we checked
What we compared with the page.
- The figure: 10xChecked
Printed word for word on the page, near the name of Spellbook.
- The passage quoted aboveChecked
Copied word for word from the page, near the name of Spellbook.
- Spellbook uses ClaudeChecked
Confirmed line.
- The result itselfNot checked
We quote it; we did not measure it.
Behind the volume, an agreement that took 10 hours of work now takes about one, what Stevenson calls “a true 10x efficiency improvement.”