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GPT-4o vs Gemini 3.1 Pro
A detailed comparison of GPT-4o (OpenAI) and Gemini 3.1 Pro (Google) across pricing, performance, and features.
Pricing Comparison
| Metric | GPT-4o | Gemini 3.1 Pro | Difference |
|---|---|---|---|
| Input / 1M tokens | $2.50 | $2.00 | -20% |
| Output / 1M tokens | $10.00 | $12.00 | +20% |
| Context window | 128K | 1M | — |
| Max output | 16.384K | 64K | — |
Benchmark Comparison
| Benchmark | GPT-4o | Gemini 3.1 Pro |
|---|---|---|
| MMLU-Pro | 80.5% | 91% |
| HumanEval | 91% | 95% |
| GPQA | 64.2% | 94.3% |
Capabilities
| Capability | GPT-4o | Gemini 3.1 Pro |
|---|---|---|
| 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- ✗Being superseded by GPT-5 series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 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)
Quick Verdict
Best value: GPT-4o is the more affordable option at $2.5/$10 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 if cost matters most. Choose Gemini 3.1 Pro if you need the best possible quality for complex tasks.