Building an AI-Powered Resume Analyzer with GPT-4o-mini and GPT-5

The author built an AI-powered resume analyzer tool that compares resumes against job descriptions, calculates an ATS-style score, and provides actionable feedback. The tool was tested with two different language models - GPT-4o-mini and GPT-5 - with the latter providing much deeper analysis and more realistic scoring.

Details

The author built an AI-powered resume analyzer tool that can analyze resumes against job descriptions, calculate an ATS-style score, and provide feedback on strengths, weaknesses, and areas for improvement. To test the tool, the author compared the performance of two different language models - the faster and cheaper GPT-4o-mini, and the more advanced GPT-5. The GPT-4o-mini model provided quick and decent insights, but with more general suggestions and slightly generous scoring. In contrast, the GPT-5 model offered a much deeper analysis, more realistic scoring, and extremely actionable feedback - almost like a career coach. For example, instead of just suggesting to 'improve backend skills', the GPT-5 model provided a detailed roadmap including building microservices, using Docker and Kubernetes, and setting up CI/CD pipelines. The author concluded that fast AI improves the user experience, while smart AI improves the quality of decisions. To combine the benefits of both, the final tool includes a 'Fast Mode' for instant results and a 'Deep Analysis Mode' for advanced insights.