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GPT-4o vs Gemini 2.5 Flash
A detailed comparison of GPT-4o (OpenAI) and Gemini 2.5 Flash (Google) across pricing, performance, and features.
Pricing Comparison
| Metric | GPT-4o | Gemini 2.5 Flash | Difference |
|---|---|---|---|
| Input / 1M tokens | $2.50 | $0.15 | -94% |
| Output / 1M tokens | $10.00 | $0.60 | -94% |
| Context window | 128K | 1M | — |
| Max output | 16.384K | 65.536K | — |
Benchmark Comparison
| Benchmark | GPT-4o | Gemini 2.5 Flash |
|---|---|---|
| MMLU-Pro | 80.5% | 76% |
| HumanEval | 91% | 89.5% |
| GPQA | 64.2% | — |
Capabilities
| Capability | GPT-4o | Gemini 2.5 Flash |
|---|---|---|
| audio | ✓ | ✗ |
| code | ✓ | ✓ |
| reasoning | ✗ | ✓ |
| text | ✓ | ✓ |
| tool-use | ✓ | ✓ |
| vision | ✓ | ✓ |
GPT-4o Strengths
- ✓Well-established and reliable
- ✓Large ecosystem of tools and integrations
GPT-4o Weaknesses
- ✗Being superseded by GPT-5 series
- ✗Higher price than newer, better alternatives
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
Quick Verdict
Best value: Gemini 2.5 Flash is the more affordable option at $0.15/$0.6 per 1M tokens.
Higher benchmarks: Gemini 2.5 Flash scores higher on average across available benchmarks (82.8% avg).
Larger context: Gemini 2.5 Flash supports 1M tokens.
Choose Gemini 2.5 Flash if cost matters most. Choose GPT-4o if you need the best possible quality for complex tasks.