Ivo releases Sage, an open model for long-horizon contract work

Ivo announced Sage at Ivo Inscribe, its first user conference, describing it as the first open-source model from a legal AI company post-trained for long-horizon contract work.[1] Ivo says the model is free for attorneys, researchers and developers to download, run and build on, and that users can fine-tune it on their own datasets.[1] Its rules and safeguards can also be adjusted for specific use cases.[1] Ivo says Sage is available through Hugging Face and that it released the model with its research and evaluation record.[2]

Ivo says it built Sage with River AI by post-training DeepSeek V4 Flash for long-horizon contract work; River AI provided technical and training-infrastructure support.[1] Ivo says training used public data and synthetic data generated by real attorneys.[1] On the Legal Agent Benchmark Contracts pass criteria, Ivo reports that Sage rose from 70% to 91% after reinforcement learning.[1] That should not be read as a 91% rate of perfect task completion: LawFuel reports that Sage completes 16.4% of contract tasks perfectly, a stricter measure.[3] LawFuel also reports a cost of about US$1.24 per task, against US$142 for a leading frontier model.[3]

Ivo previewed a new contract-review benchmark developed with research partner micro1.[1] The benchmark evaluates issue prioritization, restraint, adapting to the deal, escalation and following a playbook.[1] Ivo says models get the right answer 82% of the time when they should accept a counterparty change or leave it unchanged, but 46% when they should counter or reject it.[1] Models add a needed new point of their own only 23% of the time.[1] Ivo also says models meet 51% of criteria for standard playbook positions on average, falling to 38% when the right move depends on deal facts.[1] A public set of benchmark results is expected in the coming weeks, according to Ivo.[1]

LawFuel reports that Sage has 284 billion parameters and that Ivo’s setup instructions assume a multi-GPU server.[3] That makes the free model download distinct from a promise of cost-free or simple deployment: teams considering it should assess their own compute and integration requirements. Ivo says Sage achieved quality comparable to much larger frontier models with higher token efficiency at a fraction of the cost.[1] Those are Ivo’s claims, while the reported perfect-task completion rate and benchmark criteria pass rate describe different measures.[1][3] Separately, Ivo announced general availability of Collaborate, its contract-intelligence platform for Fortune 500 legal teams.[1]