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GPT 5 Chat

GPT 5 Chat is a conversational variant of GPT-5 optimized for multi-turn dialogue, delivering the GPT-5 family's advanced capabilities in an interface tuned specifically for chat-based applications.

Tool UseImplicit CachingFile InputVision (Image)Reasoning
index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'openai/gpt-5-chat',
  prompt: 'Why is the sky blue?'
})
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Frequently Asked Questions

  • How does GPT 5 Chat differ from base GPT-5?

    GPT 5 Chat is optimized for multi-turn dialogue patterns, producing more natural conversational flow while retaining the GPT-5 family's core reasoning and coding capabilities.

  • What context window does GPT 5 Chat support?

    128K tokens, matching the GPT-5 family and enabling extended conversation histories.

  • Is GPT 5 Chat suitable for non-chat tasks?

    It can handle them, but base GPT-5 is generally better optimized for single-shot generation, batch processing, and structured output tasks.

  • How does AI Gateway handle authentication for GPT 5 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.

  • Can I use GPT 5 Chat with function calling?

    Yes. It supports function calling and tool use, enabling conversational agents that interact with external APIs and services.

  • What are typical latency characteristics?

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