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OpenAI prices Codex access via ChatGPT Plus at $20/mo because it's the sweet spot that covers heavy inference costs while staying affordable for most devs.
Lower ($10) wouldn't recoup compute/RLHF expenses at scale. Higher ($30+) would shrink the user base.
$20 has been their proven Plus tier price for years—psychological sweet spot, matches competition like Claude's entry plans, and gives "a few focused coding sessions" per week without feeling cheap or premium.
Tiers (Free/Go $8/Plus $20) let them segment users effectively.
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