BREAKING : OpenAI introduced "Ultrafast", a new premium speed tier. 

> "Ultrafast offers up to 8× faster token generation (300 tokens per second) in Codex and up to 6x in the API."

> "GPT‑6 Astra Ultrafast is available today in the API⁠ and in ChatGPT Work and Codex⁠ on Pro 500 and Enterprise plans. GPT‑6.1 Sol Ultrafast is coming soon.

Pro 500 is mentioned too