A Comprehensive Look at GPT-5.4 Mini and Nano: OpenAI’s ‘Small’ Models with ‘Big’ Ambitions

Plus: Why this might be the most significant pricing shift in AI history The Hook Last night, I was scrolling through my feed when something made me sit up straight. OpenAI just dropped two new models — GPT-5.4 Mini and GPT-5.4 Nano. My first thought? "Is this for real?" Look, I've been following AI model releases for years. We've seen incremental improvements, modest speed gains, and occasional price cuts. But what OpenAI announced today? This is different. This isn't just a product launch. This is a pricing massacre. Let me break it down for you. The Numbers That Made Me Spit Out My Coffee Here's the pricing table that changed my evening: Model Input (per 1M tokens) Output (per 1M tokens) GPT-5.4 (flagship) $2.50 $15.00 GPT-5.4 Mini $0.75 $4.50 GPT-5.4 Nano $0.20 $1.25 Let me say that again: GPT-5.4 Mini costs just 30% of the flagship model. Nano? It's 12x cheaper. Twelve. Times. For context, Claude Opus 4.6 runs at $25 per million output tokens. GPT-5.4 Mini? $4.50. That's less than