GPT 5.4 Pro is the highest-capability tier of the GPT-5.4 family, designed for maximum performance on the most complex tasks with extended reasoning and GPT-5.4 agentic capabilities.
import { streamText } from 'ai'
const result = streamText({ model: 'openai/gpt-5.4-pro', prompt: 'Why is the sky blue?'})GPT 5.4 Pro became available on March 5, 2026 on AI Gateway as the premium tier of the GPT-5.4 model family. It's designed for developers who need maximum performance on the most complex tasks, applying extended compute to produce the deepest reasoning and highest-quality output.
Like the base GPT-5.4, it brings the agentic and reasoning leaps from GPT-5.3 Codex to all domains. The pro tier goes further, handling the subset of problems where the standard model's capability ceiling is a binding constraint. Complex multi-step workflows, advanced research synthesis, and high-stakes analysis all benefit from the additional reasoning depth.
With a context window of 1.1M tokens and the full API feature set, GPT 5.4 Pro handles any task the GPT-5.4 family supports, with more computation applied per request. Route your hardest queries here and use the standard tier for routine traffic.