GPT-5.1
by OpenAI — Price updated 2026-04-04
Pricing ($/1M tokens)
Input
$1.25
Output
$10.00
Cache Read
$0.12
Web Search
$0.01
Specifications
Context Window
272,000
Max Output
128,000
Input
image, text, file
Output
text
Tool Calling
Reasoning
Structured Output
About This Model
gpt-5.1 is a mid-range language model from OpenAI.
It supports a context window of 272K tokens with up to 128K output tokens.
Key capabilities include tool calling, extended reasoning, vision (image input).