OpenAI: GPT-5.1-Codex-Max

GPT

Code

Paid

GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic workflows spanning software engineering, mathematics, and research. GPT-5.1-Codex-Max delivers faster performance, improved reasoning, and higher token efficiency across the development lifecycle.

Parameters

Context Window

400,000

tokens

Input Price

$1.25

per 1M tokens

Output Price

$10

per 1M tokens

Capabilities

Model capabilities and supported modalities

Performance

Reasoning

Excellent reasoning capabilities with strong logical analysis

Math

Strong mathematical capabilities, handles complex calculations well

Coding

Specialized in code generation with excellent programming capabilities

Knowledge

Modalities

Input Modalities

text,image

Output Modalities

text

LLM Price Calculator

Calculate the cost of using this model

Input Tokens (0.00000125/token)$0.001875

Output Tokens (0.00001000/token)$0.030000

Common Scenarios:

Input Cost:$0.001875

Output Cost:$0.030000

Total Cost:$0.031875

Estimated usage: 4,500 tokens

Monthly Cost Estimator

Based on different usage levels

Light Usage

$0.1125

~10 requests

Moderate Usage

$1.1250

~100 requests

Heavy Usage

$11.2500

~1000 requests

Enterprise

$112.5000

~10,000 requests

Note: Estimates based on current token count settings per request.

Last Updated: 2026/02/14