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. To use this model, set model to openai/gpt-5.4-mini in the AI SDK . import { streamText } from 'ai' ; const result = streamText ( { model : 'openai/gpt-5.4-mini' , prompt : ` Scaffold a new Next.js API route that connects to our Postgres database, validates the incoming webhook payload, and writes the event to the audit_logs table.…