GPT-5.4 Integration Live
Harvey has made OpenAI's latest frontier model, GPT-5.4, available to eligible customers in the US and EU, with Australian availability to follow. The integration represents a natural extension of Harvey's commitment to bringing cutting-edge AI capabilities to legal practitioners.
Performance Improvements
Early evaluations show meaningful gains across multiple dimensions:
- BigLaw Bench score: 91.0% vs. GPT-5.2's 89.8%
- Perfect scores on risk assessment and compliance tasks
- Strong performance in deal management, drafting, and litigation filing analysis
- Improved drafting format and organizational structure compared to prior versions
Key Strengths
Harvey's Applied Legal Research team identified several practical advantages for legal workflows:
- Substantive accuracy: The model delivers stronger accuracy in legal analysis and reasoning
- Drafting precision: Direct engagement with tasks without unnecessary preamble or hedging language
- Clarity and organization: Intuitive structure with appropriate levels of detail for legal documents
- Speed: Fast processing suitable for high-volume legal work
Deployment Timeline
GPT-5.4 will be rolled out through Harvey's model selector to eligible clients in the coming days. The model is expected to excel in drafting-intensive work and transactional matters where precision and attention to contractual detail are essential. Customers in the US and EU can access it immediately upon rollout; Australian availability will be announced as regional capacity permits.