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Gemini 3.1 Pro vs GPT-4o Mini
A detailed comparison of Gemini 3.1 Pro (Google) and GPT-4o Mini (OpenAI) across pricing, performance, and features.
Pricing Comparison
| Metric | Gemini 3.1 Pro | GPT-4o Mini | Difference |
|---|---|---|---|
| Input / 1M tokens | $2.00 | $0.15 | -93% |
| Output / 1M tokens | $12.00 | $0.60 | -95% |
| Context window | 1M | 128K | — |
| Max output | 64K | 16.384K | — |
Benchmark Comparison
| Benchmark | Gemini 3.1 Pro | GPT-4o Mini |
|---|---|---|
| MMLU-Pro | 91% | 68% |
| HumanEval | 95% | 87.2% |
| GPQA | 94.3% | — |
Capabilities
| Capability | Gemini 3.1 Pro | GPT-4o Mini |
|---|---|---|
| audio | ✓ | ✗ |
| code | ✓ | ✓ |
| reasoning | ✓ | ✗ |
| text | ✓ | ✓ |
| tool-use | ✓ | ✓ |
| vision | ✓ | ✓ |
Gemini 3.1 Pro Strengths
- ✓#1 on 12 of 18 tracked benchmarks
- ✓94.3% GPQA Diamond — highest of any model
- ✓Same price as Gemini 3 Pro (free upgrade)
- ✓1M context with configurable thinking levels
Gemini 3.1 Pro Weaknesses
- ✗Still in preview
- ✗Context-tiered pricing ($4/$18 above 200K)
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: Gemini 3.1 Pro scores higher on average across available benchmarks (93.4% avg).
Larger context: Gemini 3.1 Pro supports 1M tokens.
Choose GPT-4o Mini if cost matters most. Choose Gemini 3.1 Pro if you need the best possible quality for complex tasks.