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GPT-5.2 Codex vs GPT-4o Mini
A detailed comparison of GPT-5.2 Codex (OpenAI) and GPT-4o Mini (OpenAI) across pricing, performance, and features.
Pricing Comparison
| Metric | GPT-5.2 Codex | GPT-4o Mini | Difference |
|---|---|---|---|
| Input / 1M tokens | $1.75 | $0.15 | -91% |
| Output / 1M tokens | $14.00 | $0.60 | -96% |
| Context window | 200K | 128K | — |
| Max output | 65.536K | 16.384K | — |
Benchmark Comparison
| Benchmark | GPT-5.2 Codex | GPT-4o Mini |
|---|---|---|
| MMLU-Pro | 89% | 68% |
| HumanEval | 95.5% | 87.2% |
| GPQA | 76% | — |
Capabilities
| Capability | GPT-5.2 Codex | GPT-4o 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- ✗Being superseded by 5.3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
GPT-4o Mini Strengths
- ✓Extremely cheap
- ✓Fast responses
- ✓Good enough for many production tasks
GPT-4o Mini Weaknesses
- ✗Weaker reasoning than full models
- ✗Can hallucinate more on complex topics
Quick Verdict
Best value: GPT-4o Mini is the more affordable option at $0.15/$0.6 per 1M tokens.
Higher benchmarks: GPT-5.2 Codex scores higher on average across available benchmarks (86.8% avg).
Larger context: GPT-5.2 Codex supports 200K tokens.
Choose GPT-4o Mini if cost matters most. Choose GPT-5.2 Codex if you need the best possible quality for complex tasks.