OpenAI announces GPT-5.5 API pricing

OpenAI has published API pricing for its latest GPT-5 series models. GPT-5.5 is priced at $5 per million input tokens and $30 per million output tokens, while GPT-5.4 comes in at $2.5 per million input tokens and $15 per million output tokens. The new models are expected to roll out to ChatGPT Plus and Pro subscribers over the coming weeks, with GPT-5.4 likely replacing GPT-4o as the default high-capability model for paid tiers.