# Harvey — Claude Sonnet 5, Now Live in Harvey

- Company: Harvey (harvey.ai)
- Announced: 2026-06-30T18:00:00+00:00
- Category: not stated
- Coverage: not counted
- Announcement: yes
- Group: announcements
- Source: https://www.harvey.ai/blog/sonnet-5-in-harvey
- Record: https://forck.live/items/17545-claude-sonnet-5-now-live-in-harvey
- Subject: Harvey

Announcing Sonnet 5 in Harvey. Today, we are making Claude Sonnet 5 available in Harvey. Sonnet 5 is Anthropic's latest Sonnet model, building on Sonnet 4.6 with broad gains in legal accuracy and output quality across transactional and litigation work. Sonnet 5 scored 5.8% all-pass on Harvey’s Legal Agent Benchmark (LAB), a strict evaluation that mirrors how multi-step legal work is executed at a law firm, from assignment through review. The model showed strengths across a number of practice areas, including energy and natural resources, real estate, and capital markets — with drafting as its strongest LAB task type. On BigLaw Bench, Sonnet 5 scored 91.3% — the highest we've recorded across both Sonnet and Opus models. Its consistent performance across litigation and transactional work, combined with its cost efficiency, makes it especially well-suited for high-throughput tasks. Risk assessment and compliance, case management, and transactional drafting were standout BigLaw Bench task types. “ Sonnet 5 brings a meaningful jump in legal quality over Sonnet 4.6. …

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