OpenAI's internal meme 'Are you mainlining it yet?' drives Codex development
lennysan · x · 2026-08-31
A key internal meme at OpenAI is "Are you mainlining it yet?" It asks if the team is using the product all day, every day and depending on it. This is cited as a major reason for the vibe shift toward Codex in recent months. Tara Seshan, who leads product for Codex and ChatGPT work, noted that nothing changed internally to shift the vibes; people just started noticing. The conversation also covered her rule for building on top of frontier models: build for where they will be.
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