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GPT-5.2 Codex vs o4-mini
A detailed comparison of GPT-5.2 Codex (OpenAI) and o4-mini (OpenAI) across pricing, performance, and features.
Pricing Comparison
| Metric | GPT-5.2 Codex | o4-mini | Difference |
|---|---|---|---|
| Input / 1M tokens | $1.75 | $1.10 | -37% |
| Output / 1M tokens | $14.00 | $4.40 | -69% |
| Context window | 200K | 200K | — |
| Max output | 65.536K | 100K | — |
Benchmark Comparison
| Benchmark | GPT-5.2 Codex | o4-mini |
|---|---|---|
| MMLU-Pro | 89% | 85% |
| HumanEval | 95.5% | 93.5% |
| GPQA | 76% | 76% |
Capabilities
| Capability | GPT-5.2 Codex | o4-mini |
|---|---|---|
| code | ✓ | ✓ |
| reasoning | ✓ | ✓ |
| text | ✓ | ✓ |
| tool-use | ✓ | ✓ |
| vision | ✓ | ✓ |
GPT-5.2 Codex Strengths
- ✓Strong coding performance
- ✓Available via API now
- ✓200K context window
GPT-5.2 Codex Weaknesses
- ✗Being superseded by 5.3
- ✗Higher output cost than some competitors
o4-mini Strengths
- ✓Affordable reasoning model
- ✓200K context window
- ✓Good for math and science
o4-mini Weaknesses
- ✗Slower than non-reasoning models
- ✗Reasoning tokens add to effective cost
Quick Verdict
Best value: o4-mini is the more affordable option at $1.1/$4.4 per 1M tokens.
Higher benchmarks: GPT-5.2 Codex scores higher on average across available benchmarks (86.8% avg).
Choose o4-mini if cost matters most. Choose GPT-5.2 Codex if you need the best possible quality for complex tasks.