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GPT-5.3 Chat

GPT-5.3 Chat is a conversational variant in the GPT-5.3 generation, optimized for tone, relevance, and conversational flow with reduced hallucination rates and fewer unnecessary refusals.

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index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'openai/gpt-5.3-chat',
  prompt: 'Why is the sky blue?'
})
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Frequently Asked Questions

  • How does GPT-5.3 Chat improve over GPT-5.2 chat?

    It focuses on tone, relevance, and conversational flow. Expect more accurate answers, better-contextualized web results, fewer unnecessary refusals, and reduced hallucination rates.

  • What context window does GPT-5.3 Chat support?

    128K tokens, supporting extended conversation histories.

  • Does GPT-5.3 Chat reduce hallucinations?

    Yes. The model specifically targets hallucination rate reduction, producing more factually grounded responses than previous chat variants.

  • Is GPT-5.3 Chat suitable for non-chat tasks?

    It can handle them, but GPT-5.2 or GPT-5.4 is generally better for single-shot generation, batch processing, and structured output tasks.

  • Does GPT-5.3 Chat support function calling?

    Yes. It supports function calling, enabling conversational agents that interact with external APIs and tools during dialogue.

  • How does AI Gateway handle authentication for GPT-5.3 Chat?

    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.