OpenAI just dropped two brand-new models, GPT-5.4 mini and GPT-5.4 nano, which are specifically designed to give us high-end intelligence at much faster speeds and lower costs. - GPT-5.4 mini runs 2x faster than the previous mini model while nearly matching the flagship GPT-5.4 on complex coding and reasoning benchmarks. - The new models are built for "subagent" workflows where a large model plans the work and these smaller models execute the specific tasks in parallel. - GPT-5.4 mini features a huge 400k context window in the API, making it perfect for processing long documents or large codebases without breaking the bank. - Pricing is incredibly aggressive with the nano model costing only $0.20 per 1M input tokens and $1.25 per 1M output tokens for high-volume tasks. - These models excel at "computer use" tasks like interpreting dense screenshots of user interfaces to complete actions with low latency. - Free and Go users in ChatGPT can already access the mini model through the "Thinking" feature in the plus menu. Article link: https://openai.com/index/introducing-gpt-5-4-mini-and-nano