Claude (Anthropic) vs Codex (OpenAI)
Which one should you pick? Here's the full breakdown.
Claude (Anthropic)
Anthropic's flagship LLM -- strong reasoning, long context, and the most natural conversational style
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 | Claude (Anthropic) | Codex (OpenAI) |
|---|---|---|
| Ease of Use | 9.0 | 8.0 |
| Output Quality | 9.0 | 8.0 |
| Value | 8.0 | 8.0 |
| Features | 8.0 | 9.0 |
| Overall | 8.5 | 8.3 |
Pricing Comparison
| Feature | Claude (Anthropic) | Codex (OpenAI) |
|---|---|---|
| Free Tier | Yes | Yes |
| Starting Price | $0 | $0 |
Benchmark Head-to-Head
Claude Opus 4.6 vs GPT-5.3-Codex
| Benchmark | Claude (Anthropic) | Codex (OpenAI) |
|---|---|---|
| HumanEval | 94% | 95% |
| SWE-bench | 80.8% | 72% |
Which Should You Pick?
Pick Claude (Anthropic) if...
- ✓Higher output quality (9 vs 8)
- ✓Easier to use (9 vs 8)
- ✓Stronger on real github issue fixing (+8.8% on SWE-bench)
Writers, analysts, developers, and anyone who values quality of output over quantity of features. If you care about how good the actual text is, Claude is the best.
Visit Claude (Anthropic)Pick Codex (OpenAI) if...
- ✓More features (9 vs 8)
- ✓Stronger on python code generation (+1.0% 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
Claude (Anthropic) and Codex (OpenAI) are extremely close overall. Your choice comes down to specific needs -- Claude (Anthropic) is better for writers, analysts, developers, and anyone who values quality of output over quantity of features, while Codex (OpenAI) works best for developers already paying for chatgpt plus who want a coding agent at no extra cost.