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?'})Providers
Route requests across multiple providers. Copy a provider slug to set your preference. Visit the docs for more info. Using a provider means you agree to their terms, listed under Legal.
| Provider |
|---|
 OpenAI | 128K | 1.5s | 108tps | $1.25/M | $10.00/M | Read:$0.13/M Write:— | $10.00/K + input costs | — | +4 | 11/12/2025 | ||
 Azure | 128K | 1.0s | $1.25/M | $10.00/M | Read:$0.13/M Write:— | $14/K + input costs | — | +3 | 11/12/2025 |