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. Your use is subject to OpenAI's Terms & Privacy Policies.
Tool UseImplicit CachingFile InputReasoningVision (Image)Web SearchHas Fast Mode
import { streamText } from 'ai'
const result = streamText({ model: 'openai/gpt-5.1-thinking', prompt: 'Why is the sky blue?'})Copy link to headingMore models by OpenAI
| Model |
|---|
| 1.1M | 1.8s | 171tps | $1/M$0.20/M Fast $0.40/M+1 more | $6/M$1.20/M Fast $2.40/M+1 more | Read: $0.10/M$0.02/M+1 more Write: $1.25/M$0.25/M+1 more | $10/K + input costs | +4 |    | 07/09/2026 | |||||
| 1.1M | 2.8s | 83tps | $4/M$2/M Fast $4/M+1 more | $20/M$10/M Fast $20/M+1 more | Read: $0.40/M$0.20/M+1 more Write: $5/M$2.50/M+1 more | $10/K + input costs | +4 | | 07/09/2026 | |||||
| 1.1M | 1.3s | 117tps | $2.50/M$2/M Fast $4/M+1 more | $15/M$12/M Fast $24/M+1 more | Read: $0.25/M$0.20/M+1 more Write: $3.13/M$2.50/M+1 more | $10/K + input costs | +4 | | 07/09/2026 | |||||
| 1.1M | 3.3s | 81tps | $2.50/MFast $5/M+1 more | $15/MFast $30/M+1 more | Read: $0.25/M+1 more Write: — | $10/K + input costs | +4 | | 03/05/2026 | |||||
| 400K | 5.1s | 160tps | $0.05/M | $0.40/M | Read:$0.005/M Write:— | $14/K + input costs | +3 | | 08/07/2025 | |||||
| 128K | 0.7s | 87tps | $0.15/MFast $0.25/M | $0.60/MFast $1/M | Read:$0.08/M Write:— | $14/K + input costs | +2 | | 07/18/2024 |