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GPT 5.4

GPT 5.4 is the standard tier of the GPT-5.4 model family, extending the agentic and reasoning capabilities of GPT-5.3 Codex to all domains including knowledge work, multi-step workflows, and analysis.

ReasoningTool UseVision (Image)File InputImplicit CachingWeb Search
index.ts
import { streamText } from 'ai'


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

  • How does GPT 5.4 improve over GPT-5.2?

    It extends the agentic and reasoning leaps from GPT-5.3 Codex to all domains. It's also faster and more token-efficient, reducing cost per task.

  • What context window does GPT 5.4 support?

    1.1M tokens, supporting extensive document and codebase processing.

  • What types of workflows does GPT 5.4 handle well?

    Complex multi-step workflows involving tools, research, and pulling from multiple sources. It also handles knowledge work like reports, presentations, and analysis.

  • Does GPT 5.4 support function calling and structured outputs?

    Yes. It supports the full API feature set including function calling, structured outputs, vision, and system messages.

  • Should I migrate from GPT-5.2?

    If your application benefits from improved agentic reasoning and you want better speed and token efficiency, yes. Test with your specific workloads to confirm the improvement.

  • How does AI Gateway handle authentication for GPT 5.4?

    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.