GPT-5.4 is priced at $2.50/1M input tokens and $15/1M output tokens; GPT-5.4 Pro is priced at $30/1M input tokens and $180/1M output tokens

The AI updates aren't slowing down. Literally two days after OpenAI launched a new underlying AI model for ChatGPT called GPT-5.3 Instant, the company has unveiled another, even more massive upgr...