OpenAI's 'mainlining it' meme: Why internal vibes shifted toward Codex

dkundel · x · 2026-08-31

Tara Seshan, who leads product for Codex and ChatGPT at OpenAI, shared an internal meme: "Are you mainlining it yet?" This question—asking if employees are using the product all day, every day—explains the recent vibe shift toward Codex. Seshan notes that nothing internally changed strategically; people just started noticing its value. The interview also covers her rules for building on top of frontier models.

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