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GPT 5.4 Pro

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.

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index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'openai/gpt-5.4-pro',
  prompt: 'Why is the sky blue?'
})
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Frequently Asked Questions

  • How does GPT 5.4 Pro differ from standard GPT-5.4?

    It applies more compute per request, producing deeper reasoning and higher-quality output on hard problems. On simpler tasks the difference may be minimal.

  • When is the pro tier justified?

    For high-stakes analysis, complex multi-step agentic workflows, expert-level content, and tasks where the quality difference over standard GPT-5.4 directly impacts outcomes.

  • What context window does GPT 5.4 Pro support?

    1.1M tokens, matching the GPT-5.4 family.

  • Is GPT 5.4 Pro slower than standard GPT-5.4?

    It may take longer per request due to the additional compute. For latency-sensitive applications, route only specific high-value queries to the pro tier.

  • Does GPT 5.4 Pro share the same agentic improvements as GPT-5.4?

    Yes. It includes all of GPT-5.4's agentic and reasoning advances, plus extended compute for maximum performance on the hardest problems.

  • How does AI Gateway handle authentication for GPT 5.4 Pro?

    AI Gateway accepts a single API key or OIDC token for all requests. You don't embed OpenAI credentials in your application; AI Gateway routes and authenticates on your behalf.

  • What are typical latency characteristics?

    This page shows live throughput and time-to-first-token metrics measured across real AI Gateway traffic.