Comprehensive side-by-side LLM comparison
. Both models have their strengths depending on your specific coding needs.
OpenAI
GPT-5 Codex was developed as a specialized variant of GPT-5 optimized for programming and software development tasks. Built to understand and generate code across multiple programming languages, it serves developers with enhanced capabilities for code completion, debugging, translation, and explanation of complex codebases.
Microsoft
Phi-4 Mini Reasoning was developed to incorporate extended thinking capabilities into the ultra-compact Phi-4 Mini architecture. Built to demonstrate that reasoning enhancements can be applied even to very small models, it brings analytical depth to resource-constrained environments.
4 months newer

Phi 4 Mini Reasoning
Microsoft
2025-04-30

GPT-5 Codex
OpenAI
2025-09-15
GPT-5 Codex
2024-09-30
Phi 4 Mini Reasoning
2025-02-01
Available providers and their performance metrics

GPT-5 Codex

Phi 4 Mini Reasoning

GPT-5 Codex

Phi 4 Mini Reasoning