OpenAI has published a case study describing how Notion is using its Codex tool. The study highlights three distinct applications: turning specifications into code in a single pass, building an AI-powered voice input feature for the web, and increasing the productivity of small engineering teams.
According to the source, Codex allows Notion to "one-shot" specs, meaning developers can provide a specification and receive working code without lengthy iterative cycles. This capability was also applied to create AI Voice Input for the web, a feature that likely relies on Codex to handle the underlying implementation.
The case study further emphasizes that Codex multiplies engineering power across small teams, suggesting that fewer developers can accomplish more work. Since this is a single source, there are no contrasting accounts to compare; the article simply relays the claims made by OpenAI in its own publication.