GPT-5.4 Mini and GPT-5.4 Nano from OpenAI are now available on . 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.Vercel AI Gateway 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 in the .openai/gpt-5.4-miniAI SDK GPT-5.4 Nano GPT-5.4 Nano performs close to GPT-5.4 Mini in evaluations at a lower price point. The model is well-suited for high-volume use cases like sub-agent workflows where cost scales with the number of parallel calls. To use this model, set model to in the AI SDK.openai/gpt-5.4-nano AI Gateway provides a unified API for calling models, tracking usage and cost, and configuring retries, failover, and performance optimizations for…