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GPT-5.1 Codex

GPT-5.1 optimized for agentic coding in Codex environment

Overview

GPT-5.1 optimized for agentic coding in Codex environment

Key Capabilities

Code Generation — suited for tasks requiring code generation proficiency
Agentic Coding — suited for tasks requiring agentic coding proficiency
Code Review — suited for tasks requiring code review proficiency
Debugging — suited for tasks requiring debugging proficiency
Multi File Editing — suited for tasks requiring multi file editing proficiency

Recommended Use Cases

Code Migration
Legacy Modernization
Automated Refactoring

Technical Specifications

Context Window: 256K tokens
Max Output Tokens: 66K tokens
Open Weight: No
Release Date: October 01, 2025

Pricing

$10/M input tokens, $40/M output tokens

Provider

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