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
index.ts
import { streamText } from 'ai'
const result = streamText({ model: 'openai/gpt-5.1-thinking', prompt: 'Why is the sky blue?'})More models by OpenAI
| Model |
|---|
| 1M | 0.9s | 44tps | $5.00/M | $30.00/M | Read: $0.5/M Write: — | $10.00/K + input costs | — | +4 |    | 04/24/2026 | |||
| 400K | 0.9s | 188tps | $0.75/M | $4.50/M | Read:$0.07/M Write:— | $10.00/K + input costs | — | +4 | | 03/17/2026 | |||
| 1.1M | 1.8s | 96tps | $2.50/M | $15.00/M | Read: $0.25/M Write: — | $10.00/K + input costs | — | +4 | | 03/05/2026 | |||
| 400K | 0.4s | 63tps | $1.75/M | $14.00/M | Read:$0.17/M Write:— | $10/K + input costs | — | +4 | | 02/05/2026 | |||
| 400K | 0.7s | 76tps | $1.75/M | $14.00/M | Read:$0.17/M Write:— | $14/K + input costs | — | +4 | | 12/11/2025 | |||
| 131K | 0.1s | 750tps | $0.35/M | $0.75/M | Read:$0.25/M Write:— | — | — |   +5 | 08/05/2025 |