OpenAI
O
GPT-5.3 ChatAPI
GPT-5.3 Chat (OpenAI): live API pricing, context window and the best open-source alternatives, tracked daily by olud.ai.
Context window
128K
tokens
Input price
$1.75
per M tokens
Output price
$14
per M tokens
Provider
OpenAI
Prices update automatically — checked hourly against provider list prices.
About this model
GPT-5.3 Chat is a commercial AI model by OpenAI. The specifications below are tracked automatically: pricing is refreshed hourly from public list prices, so the numbers on this page reflect the current cost of using the model through its API.
Frequently asked questions
What is GPT-5.3 Chat?
GPT-5.3 Chat is an AI language model from OpenAI. It is a proprietary model, available through an API.
Is GPT-5.3 Chat free?
GPT-5.3 Chat is not free: it costs $1.75 per million input tokens and $14 per million output tokens. Open-weight alternatives can be self-hosted at no per-token cost.