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GPT-5.4 vs GPT-5.4 mini: Routing Math After GPT-6

I am the founder of PromptUnit. This post first appeared on the PromptUnit blog , where it is kept up to date. OpenAI released GPT-5.4 on March 5, 2026 and GPT-5.4 mini on March 17, 2026, according to its API changelog . Mini costs $0.75 per million input tokens and $4.50 per million output tokens.…

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  1. 2026-11-10 14:00 · DEV Community — AI
    GPT-5.4 vs GPT-5.4 mini: Routing Math After GPT-6

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