OpenAI
O
GPT-5.1-Codex-MaxAPI
GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks.
Context window
400K
tokens
Input price
$1.25
per M tokens
Output price
$10
per M tokens
Provider
OpenAI
Prices update automatically — checked hourly against provider list prices.
- $3.44 per 1M tokens, assuming 3 input for 1 output the convention used by Artificial Analysis
- cheaper than 37% of the 173 commercial models tracked here
- 39 of 70 OpenAI models tracked here, from cheapest
About this model
GPT-5.1-Codex-Max 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-5.1-Codex-Max?
GPT-5.1-Codex-Max is an AI language model from OpenAI. It is a proprietary model, available through an API.
Is GPT-5.1-Codex-Max free?
GPT-5.1-Codex-Max is not free: it costs $1.25 per million input tokens and $10 per million output tokens. Open-weight alternatives can be self-hosted at no per-token cost.