Opus 4.6, Now Live in Harvey

This post announces the availability of Claude Opus 4.6 in Harvey, highlighting its improved substantive accuracy, source grounding, and multi-step legal task handling. It details Opus 4.6's performance on the BigLaw Bench (90.2% score, 40% perfect tasks) and notes observations on its response calibration under uncertainty, specifically the tendency to over-contextualize when less confident. The rollout plan to US and EU clients is also mentioned.