Gemini 2.5 Pro vs o3 Vision: which model should you choose?
We compared Gemini 2.5 Pro and o3 Vision on price, context window and 12 benchmarks. o3 Vision has the stronger average benchmark score; Gemini 2.5 Pro is cheaper on a blended 3:1 basis.
Gemini 2.5 Pro
Gemini 2.5 Pro is a multimodal model from Google DeepMind. It offers a 200,000-token context window, costs $15.20 per million input tokens and $57.83 per million output tokens, and averages 81.6 across the index's benchmark suite.
- Input
- $15.20 / 1M
- Output
- $57.83 / 1M
- Context
- 200,000
- Avg score
- 81.6
- Open weights
- No
o3 Vision
o3 Vision is a multimodal model from OpenAI. It offers a 1,000,000-token context window, costs $15.24 per million input tokens and $65.25 per million output tokens, and averages 81.8 across the index's benchmark suite.
- Input
- $15.24 / 1M
- Output
- $65.25 / 1M
- Context
- 1,000,000
- Avg score
- 81.8
- Open weights
- No
Specification comparison
| Spec | Gemini 2.5 Pro | o3 Vision | Edge |
|---|---|---|---|
| Input price / 1M | $15.20 | $15.24 | A |
| Output price / 1M | $57.83 | $65.25 | A |
| Context window | 200,000 | 1,000,000 | B |
| Max output | 16,384 | 8,192 | A |
| Average score | 81.6 | 81.8 | B |
| Arena Elo | 1455.0 | 1436.5 | A |
| Open weights | No | No | Tie |
Benchmark comparison
Gemini 2.5 Pro wins 5, o3 Vision wins 5, and 2 benchmarks are tied. The table shows the modelled score for each model and the gap.
| Benchmark | Gemini 2.5 Pro | o3 Vision | Gap | Winner |
|---|---|---|---|---|
| MMLU-Pro | 83.6 | 83.6 | 0.0 | Tie |
| GPQA Diamond | 76.5 | 77.8 | 1.3 | o3 Vision |
| SWE-bench Verified | 70.2 | 71.8 | 1.6 | o3 Vision |
| HumanEval | 87.7 | 85.6 | 2.1 | Gemini 2.5 Pro |
| MATH-500 | 86.8 | 84.4 | 2.4 | Gemini 2.5 Pro |
| AIME 2025 | 76.1 | 82.4 | 6.3 | o3 Vision |
| LiveCodeBench | 76.2 | 73.7 | 2.5 | Gemini 2.5 Pro |
| IFEval | 87.6 | 89.3 | 1.7 | o3 Vision |
| TruthfulQA | 82.8 | 85.8 | 3.0 | o3 Vision |
| HellaSwag | 89.7 | 89.7 | 0.0 | Tie |
| MMMU | 80.5 | 75.7 | 4.8 | Gemini 2.5 Pro |
| Arena Elo | 1455.0 | 1436.5 | 18.5 | Gemini 2.5 Pro |
Price analysis
On a blended 3:1 input-to-output basis, Gemini 2.5 Pro costs about $25.86 per million tokens and o3 Vision costs about $27.74. Gemini 2.5 Pro is roughly 7% cheaper than o3 Vision. At high volume, that gap compounds quickly, so price should carry real weight unless the quality difference is decisive.
o3 Vision has the larger context window at 1,000,000 tokens, compared with 200,000 for Gemini 2.5 Pro. That matters for long documents, large codebases and multi-step agent traces.
Verdict
Across 12 shared benchmarks, Gemini 2.5 Pro wins 5, o3 Vision wins 5, and 2 are tied. On the index average, o3 Vision leads Gemini 2.5 Pro by 0.2 points (81.8 versus 81.6).
The price picture favours Gemini 2.5 Pro. The context picture favours o3 Vision. 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 Vision for quality-sensitive work and Gemini 2.5 Pro for high-volume, well-scoped tasks. Run both on a sample of your own traffic before locking in a choice.
Choose Gemini 2.5 Pro if
- Unit cost matters and you want the cheaper blended price.
- You need the larger 16,384-token output limit.
Choose o3 Vision if
- You want the higher average benchmark score in this index.
- You need the larger 1,000,000-token context window.
FAQ
Is Gemini 2.5 Pro better than o3 Vision?
On the index average, o3 Vision leads Gemini 2.5 Pro by 0.2 points (81.8 versus 81.6). The better choice depends on price, context and your task. Gemini 2.5 Pro wins 5 benchmarks, o3 Vision wins 5.
Which is cheaper, Gemini 2.5 Pro or o3 Vision?
Gemini 2.5 Pro is cheaper on a blended 3:1 basis at about $25.86 per million tokens, versus $27.74 for o3 Vision.
Which has the larger context window?
o3 Vision has the larger context window at 1,000,000 tokens. Gemini 2.5 Pro has 200,000 tokens.
Are these models open weights?
Gemini 2.5 Pro is proprietary; o3 Vision is proprietary.
Which should I choose for production?
If you need a single default, start with o3 Vision for quality-sensitive work and Gemini 2.5 Pro for high-volume, well-scoped tasks. Run both on a sample of your own traffic before locking in a choice.