Comprehensive side-by-side LLM comparison
. Both models have their strengths depending on your specific coding needs.
Gemma 2 9B was created as a more compact open-source model, designed to deliver capable performance with reduced computational requirements. Built with 9 billion parameters and instruction tuning, it serves applications where efficiency and accessibility are valued alongside the benefits of open-source availability.
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.
1 year newer

Gemma 2 9B
2024-06-27

GPT-5 Codex
OpenAI
2025-09-15
GPT-5 Codex
2024-09-30
Available providers and their performance metrics

Gemma 2 9B

GPT-5 Codex

Gemma 2 9B

GPT-5 Codex