Release Notes
Claude Sonnet 5 Now Available in Harvey
Claude Sonnet 5 is now available in Harvey's Model Selector across Assistant, Vault, and Workflow Builder.
What's New
We've added Claude Sonnet 5 to the model selector in Harvey. Sonnet 5 builds on Sonnet 4.6 with broad gains in legal accuracy and output quality across transactional and litigation work.
Learn more about our evaluation of this model in our blog post for Sonnet 5.
Why It Matters
Sonnet 5 delivers improvements across three areas:
- Legal accuracy: Stronger on multi-step legal work, with standout results in energy and natural resources, real estate, and capital markets. Drafting is its strongest LAB task type.
- Output calibration: More accurate and precise than its predecessor, delivering stronger answers in fewer words.
- High-throughput performance: Highest BigLaw Bench score to date (91.3%), with cost efficiency that suits high-volume work. Strongest in risk assessment and compliance, case management, and transactional drafting.
For most workflows, Auto mode continues to select the right model for you, but model selection is available if you want more direct control.
This update ensures Harvey adapts to different types of legal work without changing how you normally use it.
How to Use
Open Model Selector in Assistant, Vault, or Workflow Builder to select Claude Sonnet 5 from the list of models. Admins can manage access through Access Control & Permission Management.