Release Notes
GPT-5.1 Now Available in Harvey
GPT-5.1 is available in Harvey’s Model Selector across Assistant, Vault, and Workflow Builder.
What's New
We’ve added GPT-5.1 to Harvey, offering you access to OpenAI's latest model. With this release you can expect:
- Improved legal reasoning: Scored 91.8% on Harvey’s BigLaw Bench evaluation.
- More structured drafting: Produces clearer, more consistent outputs.
- Better instruction following: Adapts to firm- or client-specific style and tone.
- Dynamic reasoning: Adjusts response depth for complex prompts.
- More reliable tool use: Handles multi-step research and drafting tasks with fewer errors.
Learn more here in our blog post.
Why It Matters
GPT-5.1 delivers more accurate and complete outputs for legal research, document comparison, and drafting. Users can expect fewer edits, more consistent formatting, and improved performance in multi-step workflows.
How to Use
- Model Selector: Choose GPT-5.1 in the selector within Assistant, Vault, or Workflow Builder.
- Access control: Model Selector is managed through Access Control & Permission Management.
- Rollout: Enabled for US and EU workspaces over the next 24 hours.
- AU support: Coming soon.
If you don’t see the Model Selector, contact your workspace admin or Customer Success Manager.
FAQs
Q: How is GPT-5.1 different from GPT-5?
A: It provides more structured, accurate outputs and stronger instruction following.
Q: Will GPT-5 still be available?
A: Yes. Both GPT-5 and GPT-5.1 will remain available for now.
Q: Where can I use GPT-5.1?
A: In Assistant, Vault, and Workflow Builder, via the Model Selector.
Q: Who has access?
A: US and EU workspaces; AU access will follow.