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Available now on ModelsLab · Language Model

GPT-5.1-Codex-MaxGPT-5.1-Codex-Max Codes Autonomously

Try GPT-5.1-Codex-MaxAPI Documentation
GPT-5.1-Codex-Max

Master Agentic Coding Workflows

Multi-Context Windows

Handle 400K Tokens Seamlessly

Process entire codebases with native compaction for sustained sessions.

Agentic Reasoning

Debug and Refactor Projects

Autonomously fix tests, write units, and resolve dependencies across files.

Security Built-In

Detect Vulnerabilities Early

Scan for insecure patterns like hard-coded credentials in full audits.

Examples

See what GPT-5.1-Codex-Max can create

Copy any prompt below and try it yourself in the playground.

REST API Scaffold

“Generate a secure Node.js REST API for user authentication with JWT, including database schema, routes, middleware for input validation, unit tests, and error handling. Use TypeScript and follow OWASP best practices.”

Microservice Refactor

“Refactor this provided Express.js microservice codebase: optimize database queries, add caching with Redis, implement rate limiting, fix cross-file dependencies, and generate updated Docker configuration.”

CLI Tool Build

“Create a Python CLI tool for log analysis: parse JSON logs, detect anomalies using statistical methods, output visualizations with Matplotlib, include setup script and comprehensive tests.”

Frontend Component

“Build a React component library for data dashboards: include responsive charts with Recharts, state management via Zustand, TypeScript types, Storybook stories, and accessibility features.”

For Developers

A few lines of code.
Agentic code. One call.

ModelsLab handles the infrastructure: fast inference, auto-scaling, and a developer-friendly API. No GPU management needed.

  • Serverless: scales to zero, scales to millions
  • Pay per token, no minimums
  • Python and JavaScript SDKs, plus REST API
API Documentation 
import requests


response = requests.post(
    "https://modelslab.com/api/v7/llm/chat/completions",
    json={
  "key": "YOUR_API_KEY",
  "prompt": "",
  "model_id": ""
}
)
print(response.json())

FAQ

Common questions about GPT-5.1-Codex-Max

Read the docs

GPT-5.1-Codex-Max API provides access to OpenAI's agentic coding model for software tasks. It supports 400K token contexts via compaction. Ideal for autonomous debugging and generation.

Gpt 5.1 codex max model uses multi-context windows and agentic loops unlike GPT-4's 8K limit. It automates project refactors and security checks. Benchmarks show 77.9% on SWE-Bench.

GPT-5.1-Codex-Max model serves as a direct alternative via API for IDEs and CLI. Enable in VS Code or GitHub Copilot with keys. Supports long-horizon engineering workflows.

Gpt-5.1-codex-max api handles 400K tokens with parallel multi-windows. Compaction retains state across sessions. Fits large microservices without manual slicing.

GPT-5.1-Codex-Max LLM scans codebases for vulnerabilities like missing validation. It flags hard-coded secrets during analysis. Built-in filters enhance detection accuracy.

Use standard LLM endpoint calls with your API key. Specify model as GPT-5.1-Codex-Max for agentic tasks. Handles iterative refinement in single sessions.

Ready to create?

Start generating with GPT-5.1-Codex-Max on ModelsLab.

Try GPT-5.1-Codex-MaxAPI Documentation