OpenAI Says GPT-6 Astra Finished Basis’s 50-Tab Tax Workbook Twice as Fast

In an OpenAI case study published September 28, 2026, the company says GPT-6 Astra completed a 50-tab tax workbook in half the time GPT-5.6 Sol took. OpenAI also says Astra’s stronger understanding of user intent gives Basis more confidence in using the model in real-world settings.

The task is relevant to Basis’s stated tax workflow: its platform gathers client data, builds workpapers, and performs quality controls as part of tax-compliance preparation. Speed on a workbook and the ability to interpret requests therefore relate to concrete parts of that workflow, though the reported comparison does not establish that other tax tasks will see the same result.

The announcement offers a specific professional-work example in which model performance involves both turnaround time and understanding what a user is asking for. OpenAI links those capabilities to Basis’s confidence in real-world use, while the reported result remains limited to the 50-tab workbook comparison.