DeepSeek vs Codex (OpenAI)
Which one should you pick? Here's the full breakdown.
DeepSeek
Near-frontier reasoning for pennies on the dollar -- the open-source LLM that made Silicon Valley nervous
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 | DeepSeek | Codex (OpenAI) |
|---|---|---|
| Ease of Use | 7.5 | 8.0 |
| Output Quality | 8.0 | 8.0 |
| Value | 9.5 | 8.0 |
| Features | 7.0 | 9.0 |
| Overall | 8.0 | 8.3 |
Pricing Comparison
| Feature | DeepSeek | Codex (OpenAI) |
|---|---|---|
| Free Tier | Yes | Yes |
| Starting Price | $0 | $0 |
Benchmark Head-to-Head
DeepSeek V3.2 vs GPT-5.3-Codex
| Benchmark | DeepSeek | Codex (OpenAI) |
|---|---|---|
| HumanEval | 91.5% | 95% |
| SWE-bench | 67.8% | 72% |
Which Should You Pick?
Pick DeepSeek if...
- ✓Better value for money (9.5/10)
Developers and teams who need strong reasoning and coding capabilities on a budget. If you're building AI features and can't justify GPT-4 API costs, DeepSeek is the obvious first stop.
Visit DeepSeekPick Codex (OpenAI) if...
- ✓More features (9 vs 7)
- ✓Stronger on real github issue fixing (+4.2% on SWE-bench)
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
Codex (OpenAI) edges out DeepSeek with a 8.3 vs 8.0 overall score. Both are solid picks, but Codex (OpenAI) has the advantage in features.