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Built with OpenAI o3, o3-Pro, GPT-4.1, and GPT-5, Basis' AI agents help accounting firms save up to 30% of their time and expand capacity for advisory and growth.

We've just sent a letter to Gov. Gavin Newsom calling for California to lead the way in harmonizing state-based AI regulation with national--and, by virtue of US leadership, emerging global--standards.

Introducing GPT-5 in our API platform--offering high reasoning performance, new controls for devs, and best-in-class results on real coding tasks.

GPT-5 is OpenAI's most advanced model--transforming enterprise AI, automation, and workforce productivity in the new era of intelligent work.

Learn how GPT-5 is used for medical research.

Learn how GPT-5 unlocks new possibilities in coding and design.

Learn how GPT-5 assists with creative writing.

See how a group of leading developers use GPT-5 for the first time.

Learn how Cursor uses GPT-5.

Discover how OpenAI's new safe-completions approach in GPT-5 improves both safety and helpfulness in AI responses--moving beyond hard refusals to nuanced, output-centric safety training for handling dual-use prompts.