Harvey Adds Claude Opus 4.6 to Legal AI Platform

Harvey has made Claude Opus 4.6 available on its platform, delivering improved accuracy and reasoning for legal work.

The February 5, 2026, release extends Opus 4.5's agentic problem-solving strengths while delivering improvements across complex legal workflows. Harvey clients in the US and EU will gain access to the model through the model selector in the coming days, with Australian availability to follow.

Legal professionals require AI systems that handle intricate, multi-step tasks with precision. Opus 4.6 addresses the legal sector's need for substantive accuracy, thorough source grounding, and nuanced handling of transactional matters where details determine outcomes. The model represents a step toward AI systems that can work alongside lawyers on their most challenging matters.

Performance Benchmarks

On Harvey's BigLaw Bench evaluation suite, Opus 4.6 achieved a 90.2% score, the highest yet for Claude models. This represents a significant milestone in legal AI performance evaluation. The model received perfect scores on 40% of tasks, demonstrating strong legal reasoning across litigation and transactional practice areas.