Gemini 3 Pro Vision vs o3 Pro: which model should you choose?
We compared Gemini 3 Pro Vision and o3 Pro on price, context window and 12 benchmarks. o3 Pro has the stronger average benchmark score; Gemini 3 Pro Vision is cheaper on a blended 3:1 basis.
Gemini 3 Pro Vision
Gemini 3 Pro Vision is a frontier model from Google DeepMind. It offers a 200,000-token context window, costs $17.59 per million input tokens and $68.83 per million output tokens, and averages 85.5 across the index's benchmark suite.
- Input
- $17.59 / 1M
- Output
- $68.83 / 1M
- Context
- 200,000
- Avg score
- 85.5
- Open weights
- No
o3 Pro
o3 Pro is a frontier model from OpenAI. It offers a 400,000-token context window, costs $17.89 per million input tokens and $81.48 per million output tokens, and averages 85.8 across the index's benchmark suite.
- Input
- $17.89 / 1M
- Output
- $81.48 / 1M
- Context
- 400,000
- Avg score
- 85.8
- Open weights
- No
Specification comparison
| Spec | Gemini 3 Pro Vision | o3 Pro | Edge |
|---|---|---|---|
| Input price / 1M | $17.59 | $17.89 | A |
| Output price / 1M | $68.83 | $81.48 | A |
| Context window | 200,000 | 400,000 | B |
| Max output | 128,000 | 8,192 | A |
| Average score | 85.5 | 85.8 | B |
| Arena Elo | 1458.1 | 1471.9 | B |
| Open weights | No | No | Tie |
Benchmark comparison
Gemini 3 Pro Vision wins 5, o3 Pro wins 7, and 0 benchmarks are tied. The table shows the modelled score for each model and the gap.
| Benchmark | Gemini 3 Pro Vision | o3 Pro | Gap | Winner |
|---|---|---|---|---|
| MMLU-Pro | 87.3 | 84.3 | 3.0 | Gemini 3 Pro Vision |
| GPQA Diamond | 80.6 | 78.7 | 1.9 | Gemini 3 Pro Vision |
| SWE-bench Verified | 76.5 | 76.9 | 0.4 | o3 Pro |
| HumanEval | 91.6 | 90.6 | 1.0 | Gemini 3 Pro Vision |
| MATH-500 | 88.4 | 92.4 | 4.0 | o3 Pro |
| AIME 2025 | 87.3 | 83.5 | 3.8 | Gemini 3 Pro Vision |
| LiveCodeBench | 79.2 | 82.4 | 3.2 | o3 Pro |
| IFEval | 90.4 | 90.9 | 0.5 | o3 Pro |
| TruthfulQA | 84.5 | 88.4 | 3.9 | o3 Pro |
| HellaSwag | 91.1 | 92.5 | 1.4 | o3 Pro |
| MMMU | 83.6 | 83.1 | 0.5 | Gemini 3 Pro Vision |
| Arena Elo | 1458.1 | 1471.9 | 13.8 | o3 Pro |
Price analysis
On a blended 3:1 input-to-output basis, Gemini 3 Pro Vision costs about $30.40 per million tokens and o3 Pro costs about $33.79. Gemini 3 Pro Vision is roughly 10% cheaper than o3 Pro. At high volume, that gap compounds quickly, so price should carry real weight unless the quality difference is decisive.
o3 Pro has the larger context window at 400,000 tokens, compared with 200,000 for Gemini 3 Pro Vision. That matters for long documents, large codebases and multi-step agent traces.
Verdict
Across 12 shared benchmarks, Gemini 3 Pro Vision wins 5, o3 Pro wins 7, and 0 are tied. On the index average, o3 Pro leads Gemini 3 Pro Vision by 0.3 points (85.8 versus 85.5).
The price picture favours Gemini 3 Pro Vision. The context picture favours o3 Pro. 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 o3 Pro for quality-sensitive work and Gemini 3 Pro Vision for high-volume, well-scoped tasks. Run both on a sample of your own traffic before locking in a choice.
Choose Gemini 3 Pro Vision if
- Unit cost matters and you want the cheaper blended price.
- You need the larger 128,000-token output limit.
Choose o3 Pro if
- You want the higher average benchmark score in this index.
- You need the larger 400,000-token context window.
FAQ
Is Gemini 3 Pro Vision better than o3 Pro?
On the index average, o3 Pro leads Gemini 3 Pro Vision by 0.3 points (85.8 versus 85.5). The better choice depends on price, context and your task. Gemini 3 Pro Vision wins 5 benchmarks, o3 Pro wins 7.
Which is cheaper, Gemini 3 Pro Vision or o3 Pro?
Gemini 3 Pro Vision is cheaper on a blended 3:1 basis at about $30.40 per million tokens, versus $33.79 for o3 Pro.
Which has the larger context window?
o3 Pro has the larger context window at 400,000 tokens. Gemini 3 Pro Vision has 200,000 tokens.
Are these models open weights?
Gemini 3 Pro Vision is proprietary; o3 Pro is proprietary.
Which should I choose for production?
If you need a single default, start with o3 Pro for quality-sensitive work and Gemini 3 Pro Vision for high-volume, well-scoped tasks. Run both on a sample of your own traffic before locking in a choice.