Founded in 2023, Basis builds AI agents used by top accounting firms—designed to take on structured accounting work with the reliability and depth those tasks require. The team uses OpenAI o3, o3‑Pro, GPT‑4.1, and GPT‑5 to power AI agents that help accounting firms automate repetitive tasks like reconciliations, journal entries, and financial summaries while giving accountants full visibility into how decisions are made and control over the process. The result is up to 30% time savings and increased capacity for high-leverage work, like advising clients and taking on new business.

As OpenAI’s models evolve, Basis compounds those improvements. Each new release expands what agents can handle, boosting reasoning quality, speeding up reviews, and unlocking more sophisticated workflows.

“We’ve worked with OpenAI from day one,” says Mitchell Troyanovsky, co-founder of Basis. “Each model improvement broadens what our agents can take on. As reasoning improves, we unlock more complex, longer-running workflows and grant our agents greater autonomy.”

Basis treats accounting as a system of workflows, each with its own context and complexity. To support that, the team built a multi-agent architecture that assigns the best-fit OpenAI model to the right job.