# Harvey — Building a Legal Coworker with GPT-5

- Company: Harvey (harvey.ai)
- Announced: 2025-08-07T17:00:00+00:00
- Category: capability-change
- Coverage: not counted
- Announcement: no
- Group: routine
- Source: https://www.harvey.ai/blog/building-a-legal-coworker-with-gpt-5
- Record: https://forck.live/items/17688-building-a-legal-coworker-with-gpt-5
- Subject: Harvey
- Models affected: GPT-5

Harvey announced that GPT-5 is live on its platform via model selector, with plans to make it the default model where it outperforms others. The model showed a 5.09% improvement over OpenAI's previous models on Harvey's BigLaw Bench evaluation, and is described as the first orchestration model capable of combining research and drafting tasks in a single agent.

## Evidence

Verbatim from https://www.harvey.ai/blog/building-a-legal-coworker-with-gpt-5:

> On BigLaw Bench, GPT-5 outperformed OpenAI’s previous frontier reasoning (o3) and non-reasoning (GPT-4.1) models by 5.09%, signifying a substantial improvement in legal reasoning capabilities.

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Record: https://forck.live/items/17688-building-a-legal-coworker-with-gpt-5
Catalogue: https://forck.live/llms.txt
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