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GPT 5.1 Thinking

GPT 5.1 Thinking is the reasoning-focused member of the GPT-5.1 family, applying extended chain-of-thought computation to produce more thorough and accurate responses on complex analytical, scientific, and multi-step problems.

Tool UseImplicit CachingFile InputReasoningVision (Image)Web Search Image Gen
index.ts
import { streamText } from 'ai'


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

Try out GPT 5.1 Thinking 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.