Gemma 2 vs GPT-5-Codex
Google Gemma 2 | OpenAI GPT-5-Codex | |
|---|---|---|
| Overview | ||
| Company | OpenAI | |
| Release date | Jun 27 2024 | Sep 15 2025 |
| Access | Open Weight | Proprietary |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | — | 39% |
| Timeline | ||
| Release gap | Gemma 2 shipped 445 days before GPT-5-Codex | |
Which is better: Gemma 2 or GPT-5-Codex?
Gemma 2 and GPT-5-Codex don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Gemma 2 shipped 445 days before GPT-5-Codex, so benchmark comparisons should account for the intervening progress.
Gemma 2 is open weight, while GPT-5-Codex is proprietary.
Direct benchmark comparisons are unavailable — Gemma 2 and GPT-5-Codex don't publish scores on any of the same benchmarks.
Frequently asked questions
Gemma 2 was released by Google on Jun 27 2024.
GPT-5-Codex was released by OpenAI on Sep 15 2025.
Gemma 2 is an open weight model released by Google. GPT-5-Codex is a proprietary model released by OpenAI.
Other comparisons
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