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GPT-5.1 Instant

GPT-5.1 Instant is the fastest model in the GPT-5.1 family, optimized for low-latency responses across general-purpose tasks, delivering GPT-5.1 generation quality at speeds suited for real-time applications.

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


const result = streamText({
  model: 'openai/gpt-5.1-instant',
  prompt: 'Why is the sky blue?'
})
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Playground

Try out GPT-5.1 Instant by OpenAI. Usage is billed to your team at API rates. Free users (those who haven't made a payment) get $5 of credits every 30 days.