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Gemini 2.5 Flash vs GPT-5.2 Codex
A detailed comparison of Gemini 2.5 Flash (Google) and GPT-5.2 Codex (OpenAI) across pricing, performance, and features.
Pricing Comparison
| Metric | Gemini 2.5 Flash | GPT-5.2 Codex | Difference |
|---|---|---|---|
| Input / 1M tokens | $0.15 | $1.75 | +1067% |
| Output / 1M tokens | $0.60 | $14.00 | +2233% |
| Context window | 1M | 200K | — |
| Max output | 65.536K | 65.536K | — |
Benchmark Comparison
| Benchmark | Gemini 2.5 Flash | GPT-5.2 Codex |
|---|---|---|
| MMLU-Pro | 76% | 89% |
| HumanEval | 89.5% | 95.5% |
| GPQA | — | 76% |
Capabilities
| Capability | Gemini 2.5 Flash | GPT-5.2 Codex |
|---|---|---|
| code | ✓ | ✓ |
| reasoning | ✓ | ✓ |
| text | ✓ | ✓ |
| tool-use | ✓ | ✓ |
| vision | ✓ | ✓ |
Gemini 2.5 Flash Strengths
- ✓One of the cheapest models available
- ✓1M context at budget pricing
- ✓Free tier available
Gemini 2.5 Flash Weaknesses
- ✗Weaker than Flash 3 on most benchmarks
- ✗Output quality inconsistent on edge cases
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- ✗Being superseded by 5.3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
Quick Verdict
Best value: Gemini 2.5 Flash 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: Gemini 2.5 Flash supports 1M tokens.
Choose Gemini 2.5 Flash if cost matters most. Choose GPT-5.2 Codex if you need the best possible quality for complex tasks.