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GPT-5.1 Codex Max

GPT-5.1 Codex optimized for long-running coding tasks

Overview

GPT-5.1 Codex optimized for long-running coding tasks

Key Capabilities

  • Code Generation — suited for tasks requiring code generation proficiency
  • Agentic Coding — suited for tasks requiring agentic coding proficiency
  • Long Running Tasks — suited for tasks requiring long running tasks proficiency
  • Complex Refactoring — suited for tasks requiring complex refactoring proficiency

Recommended Use Cases

  • Full Codebase Migration
  • Monolith To Microservices
  • Enterprise Refactoring

Technical Specifications

  • Context Window: 512K tokens
  • Max Output Tokens: 131K tokens
  • Open Weight: No
  • Release Date: November 01, 2025

Pricing

$15/M input tokens, $60/M output tokens

Provider

GPT-5.1 Codex Max is developed by OpenAI. For the latest information, visit the official documentation.