Model Details

GPT-5.3 Codex API

Newest Codex model with cutting-edge code generation. State-of-the-art performance for modern development workflows and AI coding tools.

Pricing Comparison

ProviderInput / 1MOutput / 1M
OpenAI Official$1.75$14.00
Crouter$0.50$1.75$4.00$14.00
You Save71%71%

All prices per 1M tokens. No hidden fees, no monthly minimums.

Key Features

400K Context Window

Process large codebases and complex projects. Ideal for comprehensive code analysis and multi-file operations.

Cutting-Edge Code Generation

Latest advancements in code generation technology. Produces cleaner, more efficient, and more maintainable code.

Enhanced Framework Knowledge

Up-to-date understanding of newest frameworks, libraries, and development patterns. Stays current with rapidly evolving ecosystems.

Improved Error Handling

Better at identifying edge cases and potential bugs. Generates more robust code with comprehensive error handling.

Perfect For

Next-Gen Development

Build applications with the latest frameworks and tools. GPT-5.3 Codex understands cutting-edge development patterns and best practices.

Complex System Design

Architect scalable systems with modern patterns. Provides well-reasoned architectural decisions and implementation strategies.

Code Quality Improvement

Refactor legacy code to modern standards. Applies latest best practices while maintaining backward compatibility.

Advanced Debugging

Identify and fix complex bugs across large codebases. Understands intricate code relationships and dependencies.

Technical Specifications

Model IDgpt-5.3-codex
Context Window400,000 tokens
API FormatOpenAI Chat Completions (/v1/chat/completions)
StreamingYes (SSE)
Function CallingYes
JSON ModeYes
Rate Limit70 requests/minute

Quick Start

curl https://api.crouter.dev/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.3-codex",
    "messages": [
      {"role": "user", "content": "Create a Next.js 15 app with server actions and TypeScript"}
    ]
  }'

View full documentation for more examples and integration guides.

Ready to start building?

Get your API key in 30 seconds. Works with all major AI tools and frameworks.