OpenAI: GPT-5.3-Codex (new)
GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-art results on SWE-Bench Pro and strong performance on Termin...
Try OpenAI: GPT-5.3-Codex (new) in Kilo Code
Experience this model with the most popular open source coding agent. Free to start, pay only for AI usage. Use in popular IDEs like VS Code, JetBrains, command line, or cloud agents.
Downloads
models supported
to Start
Access 500+ models including OpenAI: GPT-5.3-Codex (new) and many more in Kilo Code
Benchmarking OpenAI: GPT-5.3-Codex (new)
Real-World Usage
Real-world usage statistics from the Kilo Code community
Weekly Token Usage
Mode Rankings (Last Week)
Where this model ranks for each built-in mode
Architect
Plan and design before implementation
Code
Write, modify, and refactor code
Ask
Get answers and explanations
Debug
Diagnose and fix software issues
Orchestrator
Coordinate tasks across multiple modes
Real-world metrics from the Kilo Code Leaderboard
Pricing
Cost per 1 million tokens
Example Cost
Analyzing a 10,000 line codebase (≈40k input tokens, 10k output tokens) costs approximately $0.2100
Coding Capabilities
Features and parameters relevant to coding tasks
Coding Features
Pricing details from OpenRouter
Technical Details
Architecture and implementation specifications
Ready to try OpenAI: GPT-5.3-Codex (new)?
Install Kilo Code and start using OpenAI: GPT-5.3-Codex (new) for your coding projects today. Choose from 500+ AI models with complete freedom.