This is Ultrafast.
Our premium speed tier, Ultrafast offers up to 8x faster token generation (300 tokens per second) in Codex and up to 6x in the API.
OpenAI launches Ultrafast tier with up to 8x faster token generation
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OpenAI introduced Ultrafast, a premium speed tier offering up to 8x faster token generation, reaching 300 tokens per second, in Codex. The same tier provides up to 6x faster generation in the API.
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Source: OpenAI · x.comPublished · added here