Is GPT-6 50% cheaper? GPT‑6 Luna vs. GPT‑5.6 Luna | $0.20 → $0.10 | $1.20 → $0....

simonw · 2026-09-22T19:04:56 1790103896

The table on https://developers.openai.com/api/docs/pricing is more readable:

  +--------------+-------+--------------+--------------+--------+
  | Model        | Input | Cached input | Cache writes | Output |
  +--------------+-------+--------------+--------------+--------+
  | gpt-6-luna   | $0.10 | $0.01        | $0.125       | $0.50  |
  | gpt-5.6-luna | $0.20 | $0.02        | $0.25        | $1.20  |
  +--------------+-------+--------------+--------------+--------+

norman784 · 2026-09-22T19:16:34 1790104594

Yeah, how they put, is confusing to me, they should have put that table instead of what they have right now in the article.

tedsanders · 2026-09-22T19:02:43 1790103763

Yes, GPT-6 Luna is 50%-58% cheaper than GPT-5.6 Luna. (I think the blog text and graphs make it pretty clear.)

norman784 · 2026-09-22T19:18:20 1790104700

Yeah, but it confuses me, I read left to right, so if they put GPT-6 and $0.20 first, I would assume that's the new pricing, they should make it clear, not confusing.