Basis completes a tax workbook 2x faster with GPT-6 Astra Basis completes a tax workbook 2x faster with GPT-6 Astra openai.com/ai 2026-09-28 1 min read original GPT-6 Astra completed a 50-tab tax workbook twice as fast as GPT-5.6 Sol, and its stronger understanding of user intent gives Basis more confidence in real-world use.