Pricing, Performance & Features Comparison
GPT-5.3-Codex is OpenAI's most capable agentic coding model, combining frontier coding performance with the reasoning and professional knowledge capabilities of GPT-5.2 in a single model that is 25% faster than GPT-5.2-Codex. It is designed to handle long-running tasks involving research, tool use, and complex execution, enabling it to perform nearly any task a professional can do on a computer, from debugging and deployment to creating spreadsheets and presentations.
GLM-5 is a mixture-of-experts language model from Z.ai with 744 billion total parameters and 40 billion active parameters, designed for complex systems engineering and long-horizon agentic tasks. It utilizes DeepSeek Sparse Attention (DSA) to reduce deployment costs while maintaining long-context capacity, and achieves best-in-class performance among open-source models in reasoning, coding, and agentic tasks.