GPT-5.4 Mini and GPT-5.4 Nano from OpenAI are now available on Vercel AI Gateway . Both models deliver state-of-the-art performance for their size class in coding and computer use, and are built for sub-agent workflows where multiple smaller models coordinate on parts of a larger task.

The models also support the verbosity and reasoning level parameters, giving you control over response detail and how much the model reasons before answering.

GPT-5.4 Mini

GPT-5.4 Mini handles code generation, tool orchestration, and multi-step browser interactions more reliably than previous mini-tier models. It's a strong default for agentic tasks that need to balance capability and cost.…