Cosine AI is a London-based artificial intelligence company building autonomous software engineering agents under the Genie product line. Founded in 2022 by Alistair Pullen, Yang Li, and Sam Stenner and backed by Y Combinator's Winter 2023 batch, the company set out to compress engineering work by training models specifically on the reasoning patterns of professional software developers rather than on generic code corpora.
Genie, the company's flagship product, attracted attention in 2024 when it scored approximately 30 percent on the SWE-Bench benchmark, ahead of comparable agents from Cognition, Amazon, and Factory at the time. The platform integrates across desktop, cloud, and terminal environments, supports parallel multi-agent execution, and offers flexible deployment models including public cloud, dedicated tenant, and air-gapped configurations aimed at regulated industries.
Cosine raised approximately $2.5 million in seed funding in August 2024 and has since reported total disclosed funding around $8 million from investors including Lakestar, Soma Capital, UpHonest Capital, and Gaingels, with advisory support from Michael Seibel and Tom Blomfield. In April 2026 Cosine was named in the first cohort of the United Kingdom's Sovereign AI programme, receiving an allocation of 500,000 GPU hours on the Isambard-AI supercomputer to train fully sovereign AI coding models for defence, national security, and other regulated sectors.
The company competes with Cognition's Devin, Factory, and Amazon Q in the autonomous coding agent category, differentiating on its training methodology, parallel execution model, and sovereign deployment story aimed at UK and European public sector and defence customers.