GPT-5.4 and GPT-5.4 Pro are now available on AI Gateway.

This model brings the agentic and reasoning leaps from GPT-5.3-Codex to all domains. This includes knowledge work like reports, spreadsheets, presentations, and analysis in addition to coding. It handles complex multi-step workflows more reliably, including tasks that involve tools, research, and pulling from multiple sources. GPT-5.4 is faster and also more token-efficient than previous iterations (GPT-5.2). GPT-5.4 Pro is for developers who need maximum performance on the most complex tasks.

To use this model, set model to openai/gpt-5.4 or openai/gpt-5.4-pro in the AI SDK.

import { streamText } from 'ai';
const result = streamText({
  model: 'openai/gpt-5.4',
  prompt:
    `Refactor our API layer to use the new auth SDK, update the
     affected tests and docs, then generate a migration guide
     for the rest of the team.`,
});

AI Gateway provides a unified API for calling models, tracking usage and cost, and configuring retries, failover, and performance optimizations for higher-than-provider uptime. It includes built-in observability, Bring Your Own Key support, and intelligent provider routing with automatic retries.

Learn more about AI Gateway, view the AI Gateway model leaderboard or try it in our model playground.