Codex (OpenAI) vs Gamma
Which one should you pick? Here's the full breakdown.
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
Gamma
AI presentation maker that turns prompts into polished, web-native decks in minutes
| Category | Codex (OpenAI) | Gamma |
|---|---|---|
| Ease of Use | 8.0 | 9.0 |
| Output Quality | 8.0 | 7.5 |
| Value | 8.0 | 8.0 |
| Features | 9.0 | 7.0 |
| Overall | 8.3 | 7.9 |
Pricing Comparison
| Feature | Codex (OpenAI) | Gamma |
|---|---|---|
| Free Tier | Yes | Yes |
| Starting Price | $0 | $0 |
Benchmark Head-to-Head
GPT-5.3-Codex benchmarks — Gamma has no published benchmarks
| Benchmark | Description | Score |
|---|---|---|
| SWE-bench | Real GitHub issue fixing | 72% |
| HumanEval | Python code generation | 95% |
Which Should You Pick?
Pick Codex (OpenAI) if...
- ✓More features (9 vs 7)
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)Pick Gamma if...
- ✓Easier to use (9 vs 8)
Startup founders pitching investors, marketers building quick client presentations, and anyone who needs a solid deck fast without touching PowerPoint.
Visit GammaOur Verdict
Codex (OpenAI) edges out Gamma with a 8.3 vs 7.9 overall score. Both are solid picks, but Codex (OpenAI) has the advantage in output quality.