Descant's first public benchmark announcement
The starting point: 86.46% on SWE-bench Pro, and an ambition to carry autonomous engineering across sustained product development.
The June 27 announcement
86.46%
SWE-bench Pro
A first public signal
On June 27, we shared the first public benchmark announcement for the autonomous software engineering system we were building. The post reported 86.46% on SWE-bench Pro. It also described the pace of our own development: approximately 13,800 GitHub contributions over 60 days, with a previous annual contribution high surpassed in three days.
The result gave us a concrete starting point for talking about Descant. We were building a system that could carry engineering work through a disciplined process and produce changes that stood up to evaluation. The public announcement made that work visible and opened the conversation about what autonomous software engineering could become.
The ambition behind the result
Our main focus is production-grade software engineering over sustained work. A useful system needs to understand the task, make a focused change, respond to review, and preserve the decisions that should guide future changes. It also needs to operate under the authority and standards of the team responsible for the repository.
That is the direction we are taking with Descant: an autonomous engineering system that helps build and evolve whole codebases. The benchmark announcement was an early milestone in that effort. The following months would bring more work on learning, review, work relationships, and the product experience around the engineering loop.
Follow the work from here
This journal brings those milestones together. Some are about how Descant develops a change. Others are about the products we build with its next generation and the lessons that flow back into it. Together they trace the path from a first public result toward a closed beta for teams with meaningful engineering work to delegate.
The original announcement is linked below. It records the 86.46% figure shared on June 27; our October 15 post carries the later published result. As we continue building, we will use this space to show what is changing and what it enables for the people and teams using Descant.