← GPT-6.1 Sol Guide · Updated Sept 30, 2026

AI Model Guide · Sept 2026

Changelog

Material changes to the facts, prices and features on this guide. Minor styling tweaks aren’t listed.

Sept 30, 2026

• Added a monthly-cost calculator to the pricing page — enter your token usage and cache share to compare Astra, Sol and Luna.
• Tightened the comparison table to the three models with published prices (GPT-6 Sol is superseded).
• Dated the Ultrafast variant status as “not yet released” (as of Sept 30).

Sept 29–30, 2026

• First published: guide, pricing, benchmarks, how to use, comparison and FAQ, based on OpenAI’s GPT-6.1 Sol announcement.

Sources: OpenAI announcement.