GPT 5.4 Mini (Fast)

GPT-5.4 Mini (Fast) is positioned as a streamlined offshoot of the GPT-5.4 family, optimized for high-volume and latency-sensitive workloads. Vercel's AI Gateway routing page frames it as carrying over the core strengths of GPT-5.4 while trading some capacity for speed and efficiency, making it a practical choice when throughput and responsiveness matter more than maximum depth. The underlying model is provided by OpenAI and resold through Vercel, with usage explicitly governed by OpenAI's Terms of Use and Privacy Policy, so developers get a familiar OpenAI model behind a Vercel-managed endpoint. <parameter name="temperature">0.3

In practical terms, this variant is well suited to production pipelines that need reasoning, tool use, and visual inputs handled quickly and reliably. Vercel's page advertises capabilities such as reasoning, tool use, vision-based image input, file input, implicit caching, web search, and websocket streaming, giving teams flexible options for building agents, assistants, and real-time interfaces. Because it is exposed through the Vercel AI Gateway, it can be accessed via standard API endpoints as well as AI SDK integrations in TypeScript and Python, with multiple interface patterns (Chat Completions, Messages, and Responses) and tooling connectors like Claude Code, Codex, Hermes, OpenCode, and OpenClaw, which lowers the friction of plugging it into existing application stacks.