SWE-1 ai coding modelWindsurf's in-house AI model family purpose-built for end-to-end software engineering workflows.

SWE-1 is a family of AI coding models developed by Windsurf to power assistive and agentic software engineering tasks inside its IDE and related products. Rather than focusing solely on code completion, the models are tuned for the broader engineering loop, including reasoning across files, navigating large repositories, and collaborating with human developers over longer sessions. The lineup typically spans different sizes and capability tiers, letting Windsurf route lightweight tasks like autocomplete to faster variants while reserving more capable models for complex edits, refactors, and agent workflows. Because the models are trained with real developer activity in mind, they aim to handle incomplete states, multi-step changes, and tool use more naturally than general-purpose LLMs. SWE-1 is most useful to teams already working inside Windsurf who want a tightly integrated coding model rather than a general chatbot bolted onto an editor.