You can now access OpenAI's latest models, GPT-5.1 Instant and GPT-5.1 Thinking, using Vercel's AI Gateway with no other provider accounts required.

• GPT-5.1 Instant offers improved instruction following, adaptive reasoning, and warmer, more conversational responses.

• GPT-5.1 Thinking builds on GPT-5 Thinking with dynamic performance tuning that prioritizes speed for simple tasks and deeper reasoning for complex ones.

To use these models with the AI SDK, set the model to openai/gpt-5.1-instant or openai/gpt-5.1-thinking:

import { streamText } from 'ai'
const result = streamText({
  model: "openai/gpt-5.1-instant",
  prompt: "What are the benefits to adaptive reasoning?" 
})

AI Gateway provides a unified API for calling models, tracking usage and cost, and configuring retries, failover, and performance optimizations for higher-than-provider uptime. It includes built-in observability, Bring Your Own Key support, and intelligent provider routing with automatic retries.

Learn more about AI Gateway, view the AI Gateway model leaderboard or try it in our model playground.