openai
OpenAI: GPT-5.1 Chat
openai/gpt-5.1-chat
For $1, you can send approximately:
~12.7messages
How do we get this number?
One message = ~7,000 input tokens + ~7,000 output tokens
Input cost per message7,000 x $1.25/M = $0.008750
Output cost per message7,000 x $10.00/M = $0.070000
Total cost per message$0.078750
Messages for $112.70
Context window
128k
tokens
Max response
16k
tokens
Input price
$1.25
per million tokens
Output price
$10.00
per million tokens
Modalities
Input:fileInput:imageInput:textOutput:text
Description
GPT-5.1 Chat (AKA Instant is the fast, lightweight member of the 5.1 family, optimized for low-latency chat while retaining strong general intelligence. It uses adaptive reasoning to selectively “think” on...