Gemini (Google) vs Codex (OpenAI)
Which one should you pick? Here's the full breakdown.
Gemini (Google)
Google's LLM with deep Google Workspace integration, 2M token context window, and native code execution
Codex (OpenAI)
OpenAI's cloud-based coding agent -- runs parallel tasks, proposes PRs, and lives inside ChatGPT
Powered by GPT-5.3-Codex / GPT-5.4
| Category | Gemini (Google) | Codex (OpenAI) |
|---|---|---|
| Ease of Use | 8.0 | 8.0 |
| Output Quality | 8.0 | 8.0 |
| Value | 9.0 | 8.0 |
| Features | 8.0 | 9.0 |
| Overall | 8.3 | 8.3 |
Pricing Comparison
| Feature | Gemini (Google) | Codex (OpenAI) |
|---|---|---|
| Free Tier | Yes | Yes |
| Starting Price | $0 | $0 |
Benchmark Head-to-Head
Gemini 3.1 Ultra vs GPT-5.3-Codex
| Benchmark | Gemini (Google) | Codex (OpenAI) |
|---|---|---|
| HumanEval | 93.5% | 95% |
| SWE-bench | 80.6% | 72% |
Which Should You Pick?
Pick Gemini (Google) if...
- ✓Better value for money (9/10)
- ✓Stronger on real github issue fixing (+8.6% on SWE-bench)
Google Workspace power users. If you live in Gmail, Docs, and Drive, Gemini Advanced integrates directly into your workflow. Also great for developers who need the cheapest API with the longest context window.
Visit Gemini (Google)Pick Codex (OpenAI) if...
- ✓More features (9 vs 8)
- ✓Stronger on python code generation (+1.5% on HumanEval)
Developers already paying for ChatGPT Plus who want a coding agent at no extra cost. Especially good for parallel task execution -- assign multiple bug fixes or feature branches and let Codex work them simultaneously.
Visit Codex (OpenAI)Our Verdict
Gemini (Google) and Codex (OpenAI) are extremely close overall. Your choice comes down to specific needs -- Gemini (Google) is better for google workspace power users, while Codex (OpenAI) works best for developers already paying for chatgpt plus who want a coding agent at no extra cost.