Gemini 3 Pro Pro vs o4 Reasoning: which model should you choose?
We compared Gemini 3 Pro Pro and o4 Reasoning on price, context window and 12 benchmarks. o4 Reasoning has the stronger average benchmark score; o4 Reasoning is cheaper on a blended 3:1 basis.
Gemini 3 Pro Pro
Gemini 3 Pro Pro is a frontier model from Google DeepMind. It offers a 200,000-token context window, costs $19.80 per million input tokens and $108.61 per million output tokens, and averages 87.3 across the index's benchmark suite.
- Input
- $19.80 / 1M
- Output
- $108.61 / 1M
- Context
- 200,000
- Avg score
- 87.3
- Open weights
- No
o4 Reasoning
o4 Reasoning is a frontier model from OpenAI. It offers a 1,000,000-token context window, costs $19.69 per million input tokens and $103.53 per million output tokens, and averages 87.5 across the index's benchmark suite.
- Input
- $19.69 / 1M
- Output
- $103.53 / 1M
- Context
- 1,000,000
- Avg score
- 87.5
- Open weights
- No
Specification comparison
| Spec | Gemini 3 Pro Pro | o4 Reasoning | Edge |
|---|---|---|---|
| Input price / 1M | $19.80 | $19.69 | B |
| Output price / 1M | $108.61 | $103.53 | B |
| Context window | 200,000 | 1,000,000 | B |
| Max output | 8,192 | 128,000 | B |
| Average score | 87.3 | 87.5 | B |
| Arena Elo | 1484.4 | 1472.2 | A |
| Open weights | No | No | Tie |
Benchmark comparison
Gemini 3 Pro Pro wins 5, o4 Reasoning wins 7, and 0 benchmarks are tied. The table shows the modelled score for each model and the gap.
| Benchmark | Gemini 3 Pro Pro | o4 Reasoning | Gap | Winner |
|---|---|---|---|---|
| MMLU-Pro | 88.2 | 86.1 | 2.1 | Gemini 3 Pro Pro |
| GPQA Diamond | 81.4 | 84.0 | 2.6 | o4 Reasoning |
| SWE-bench Verified | 75.7 | 76.4 | 0.7 | o4 Reasoning |
| HumanEval | 95.0 | 90.2 | 4.8 | Gemini 3 Pro Pro |
| MATH-500 | 91.6 | 94.8 | 3.2 | o4 Reasoning |
| AIME 2025 | 88.0 | 90.3 | 2.3 | o4 Reasoning |
| LiveCodeBench | 83.1 | 83.4 | 0.3 | o4 Reasoning |
| IFEval | 92.7 | 94.5 | 1.8 | o4 Reasoning |
| TruthfulQA | 87.6 | 89.0 | 1.4 | o4 Reasoning |
| HellaSwag | 93.6 | 92.4 | 1.2 | Gemini 3 Pro Pro |
| MMMU | 83.2 | 81.8 | 1.4 | Gemini 3 Pro Pro |
| Arena Elo | 1484.4 | 1472.2 | 12.2 | Gemini 3 Pro Pro |
Price analysis
On a blended 3:1 input-to-output basis, Gemini 3 Pro Pro costs about $42.00 per million tokens and o4 Reasoning costs about $40.65. o4 Reasoning is roughly 3% cheaper than Gemini 3 Pro Pro. At high volume, that gap compounds quickly, so price should carry real weight unless the quality difference is decisive.
o4 Reasoning has the larger context window at 1,000,000 tokens, compared with 200,000 for Gemini 3 Pro Pro. That matters for long documents, large codebases and multi-step agent traces.
Verdict
Across 12 shared benchmarks, Gemini 3 Pro Pro wins 5, o4 Reasoning wins 7, and 0 are tied. On the index average, o4 Reasoning leads Gemini 3 Pro Pro by 0.2 points (87.5 versus 87.3).
The price picture favours o4 Reasoning. The context picture favours o4 Reasoning. Those two dimensions often matter more than a few benchmark points once a model is good enough for the task.
If you need a single default, start with o4 Reasoning for quality-sensitive work, and check whether its price holds at your expected volume before committing.
Choose Gemini 3 Pro Pro if
- You prefer Google DeepMind's tooling or already use it.
Choose o4 Reasoning if
- You want the higher average benchmark score in this index.
- Unit cost matters and you want the cheaper blended price.
- You need the larger 1,000,000-token context window.
- You need the larger 128,000-token output limit.
FAQ
Is Gemini 3 Pro Pro better than o4 Reasoning?
On the index average, o4 Reasoning leads Gemini 3 Pro Pro by 0.2 points (87.5 versus 87.3). The better choice depends on price, context and your task. Gemini 3 Pro Pro wins 5 benchmarks, o4 Reasoning wins 7.
Which is cheaper, Gemini 3 Pro Pro or o4 Reasoning?
o4 Reasoning is cheaper on a blended 3:1 basis at about $40.65 per million tokens, versus $42.00 for Gemini 3 Pro Pro.
Which has the larger context window?
o4 Reasoning has the larger context window at 1,000,000 tokens. Gemini 3 Pro Pro has 200,000 tokens.
Are these models open weights?
Gemini 3 Pro Pro is proprietary; o4 Reasoning is proprietary.
Which should I choose for production?
If you need a single default, start with o4 Reasoning for quality-sensitive work, and check whether its price holds at your expected volume before committing.