Basis completes tax workbook twice as fast with GPT‑6 Astra
Basis, which builds AI agents for accountants, reports that its agents finish a 50‑tab tax workbook in half the time when using the new GPT‑6 Astra model compared with GPT‑5.6 Sol. In internal tests the model reduced task duration by 50% and delivered about a 20% improvement in Basis’s internal evaluation scores.
Key points
- GPT‑6 Astra completes a 50‑tab tax workbook in half the time of GPT‑5.6 Sol
- Internal evaluation scores improved about 20% with GPT‑6 Astra
- Model adjusts reasoning effort during tasks, reducing token use and cost
The company says GPT‑6 Astra better understands user intent, asks clarifying questions, flags assumptions and follows instructions with fewer explicit rules. Troyanovsky notes the model can adjust its reasoning effort during a task, increasing computation for difficult steps and scaling back for easier ones while keeping its cache intact, which lowers token usage, cost and response time.
Basis believes these advances let its agents take more direct paths through long‑running tasks, reducing the need for manual rule‑writing and improving confidence that agents can handle situations beyond internal tests.
Model page: GPT-6 Astra →
Basis completes a tax workbook 2x faster with GPT-6 Astra
OpenAI · 28 September 2026
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