OpenAI: GPT-5 Codex

OpenAI's GPT-5 Codex, created on September 23, 2025, is a specialized AI model designed for advanced software engineering and coding workflows. It demonstrates competitive response times, ranking in the 51st percentile across seven benchmarks, and offers moderate pricing, placing it in the 21st percentile. A standout feature is its exceptional reliability, achieving a perfect 100% success rate across all benchmarks, indicating minimal technical failures. In terms of performance across categories, GPT-5 Codex excels in Hallucinations and Ethics, achieving 100% accuracy in both, with the former also being the most accurate and fastest at its price point. It shows strong capabilities in Coding (94.0% accuracy, 87th percentile) and Reasoning (96.0% accuracy, 82nd percentile), highlighting its proficiency in complex problem-solving and programming tasks. General Knowledge and Mathematics also show solid performance at 99.5% and 93.0% accuracy respectively. Its Email Classification accuracy is 98.0%. The model's ability to adapt reasoning effort dynamically and integrate into various developer environments further enhances its utility for agentic coding applications.