Ivo Sage
Ivo's open-source model post-trained for long-horizon contract work, built by RL-fine-tuning DeepSeek V4 Flash on attorney-generated data with River AI.
Why it matters
First legal-AI company to open-source its model: a contract specialist that went from 70% to 91% on Ivo's Legal Agent Benchmark (Contracts), matching much larger frontier models at a fraction of the cost.
What you could build with it
A legal-tech startup could fine-tune Ivo Sage on its own playbooks and clause libraries to offer affordable automated contract review for mid-market firms, a segment priced out of enterprise legal-AI suites.
Does it hold up?
Too early to judge — released Oct 1 with weights on Hugging Face; Ivo's 70%-to-91% benchmark gain is a vendor claim with no independent evaluation yet.
Learn more
First spotted on article: source.
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