Harvey + Legora on OpenAI’s GPT-6 Astra

OpenAI has released GPT-6 Astra, its new flagship model and their most capable LLM yet for end-to-end tasks. Both Harvey and Legora have provided some insights into how it benefits legal AI, (see below).

GPT‑6 Astra started its roll out on September 3rd on a limited basis and will eventually be more widely available. But, the question is: with so many models arriving now, is this a big deal?

The short answer is: yes, because the major model makers are showing that they can – albeit incrementally – keep improving AI performance. And that matters especially for lawyers, as there is a hard to define threshold under which legal AI is of limited standalone use, but conversely where once it hits a certain level of dependability it becomes immensely powerful.

For example, OpenAI provided a range of benchmarks showing many improvements, one of which was ‘Agents’ Last Exam’ – a benchmark created at UC Berkley RDI to answer the question: ‘Can an AI agent perform economically valuable professional work from beginning to end?’

It covers 55 professional ‘subdomains’ and includes some aspects of legal work, among many others. In this case (see graph) it reached 59.3%, while GPT-5.6 Sol reached 53.6%.