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GPT 5.1 Thinking (Fast)

An upgraded version of GPT-5 that adapts thinking time more precisely to the question to spend more time on complex questions and respond more quickly to simpler tasks. Your use is subject to OpenAI's Terms & Privacy Policies.

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


const result = streamText({
  model: 'openai/gpt-5.1-thinking-fast',
  prompt: 'Why is the sky blue?'
})
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Provider
Context
Max Output
Latency
Throughput
Input
Output
Cache
Web Search
Capabilities
ZDR
No Training
Release Date
OpenAI
Legal:Terms•Privacy
400K128K
0.5s
83tps
$2.50/M
$20/M
Read:$0.25/M
Write:—
$10/K
+ input costs
+3
11/12/2025