GPT-5.1 Thinking

openai

OpenAI's premier thinking model with precisely tuned adaptive reasoning. This upgraded version excels at complex analytical tasks, sophisticated coding, and multi-step problem-solving with transparent thought processes.

Try Now

Capabilities

Tool Use

Image Input

PDF Input

Extended Thinking

Example Use Cases

Complex analytical tasks

Sophisticated coding

Multi-step problem-solving

Technical Specifications

Context Window

400,000 tokens

Max Output

128,000 tokens

Input Cost

$1.25 per 1M tokens

Output Cost

$10 per 1M tokens

Cache Read Cost

$0.125 per 1M tokens

Web Search Cost

$15 per 1K calls

⚠️ Deprecated

Deprecated on

Reason

Outdated model

Recommended Replacement

GPT-5.2

Availability

Plus

Minimum plan required

$20 per month

Also available in these plans

Pro
$100/mo
Super
$200/mo