How Basis Builds Long-Horizon Accounting Agents With Cursor
Anysphere, Friday, September 4th, 2026
Basis builds accounting agents on Cursor that finish partnership tax returns up to 6x faster, used by 40% of top 25 firms.
Cursor profiles Basis, a North American AI company that has built its accounting agent product on Cursor since day one.
Basis agents autonomously complete long-horizon workflows such as month-end close, corporate and partnership tax returns, and audit planning and fieldwork, returning review-ready output.
On a Form 1065 partnership return the agent takes six to seven hours against 30 to 40 hours of human time, roughly a 6x speedup, and the product is used by 40% of the top 25 accounting firms.
The post's technical argument is that Basis treats the context the agent reads, including prompts, skills, instructions and tool descriptions, with the same rigor as production code, and uses behavior specs to make the expected standard explicit.