Released09/2025
Speed0 tokens/s
Time to first token0.00s
Input price$1.25/1M
Output price$10/1M
Rankings
Review
GPT-5 Codex is a strong choice for engineers and scientists needing high precision in mathematics and coding, but is weak in open-ended dialogue and conversational AI. Suited for STEM professionals rather than general chat applications.
Strengths
- Excels in mathematics and programming, ranking in the top 3 within its specialized domain
- Decent logical reasoning and AI Agent handling, suitable for complex problems
- Well-suited for STEM tasks requiring high precision
Weaknesses
- Weak general chat (ranked #59), making it a poor choice for open-ended conversation or customer support
- Lower AI Agent ranking compared to mathematics, limiting its ability to handle complex automation tasks
- No clear standout strengths outside mathematics and programming
Use cases
Solving mathematical problems, data science, and analyticsProgramming and software development, particularly code generationLogical reasoning and solving structured, complex problems
Guides & videos
Access ChatGPT (chatgpt.com) with a ChatGPT Plus subscription or higher, then select GPT-5.3-Codex or GPT-5.5-Codex from the model menu. Use the model to write code, debug, and solve complex programming challenges. Describe requirements in natural language, and the model will generate code or explanations. Pro tip: include existing code context to help the model better understand the codebase; use the Codex CLI or IDE extensions (VS Code, JetBrains) to integrate it into your development workflow.