Gemini 2.5 Pro vs Gemini 3 Flash Vision: which model should you choose?
We compared Gemini 2.5 Pro and Gemini 3 Flash Vision on price, context window and 12 benchmarks. Gemini 3 Flash 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
Gemini 3 Flash Vision
Gemini 3 Flash Vision is a multimodal model from Google DeepMind. It offers a 400,000-token context window, costs $15.06 per million input tokens and $82.14 per million output tokens, and averages 81.9 across the index's benchmark suite.
- Input
- $15.06 / 1M
- Output
- $82.14 / 1M
- Context
- 400,000
- Avg score
- 81.9
- Open weights
- No
Specification comparison
| Spec | Gemini 2.5 Pro | Gemini 3 Flash Vision | Edge |
|---|---|---|---|
| Input price / 1M | $15.20 | $15.06 | B |
| Output price / 1M | $57.83 | $82.14 | A |
| Context window | 200,000 | 400,000 | B |
| Max output | 16,384 | 32,768 | B |
| Average score | 81.6 | 81.9 | B |
| Arena Elo | 1455.0 | 1430.3 | A |
| Open weights | No | No | Tie |
Benchmark comparison
Gemini 2.5 Pro wins 7, Gemini 3 Flash Vision wins 5, and 0 benchmarks are tied. The table shows the modelled score for each model and the gap.
| Benchmark | Gemini 2.5 Pro | Gemini 3 Flash Vision | Gap | Winner |
|---|---|---|---|---|
| MMLU-Pro | 83.6 | 81.8 | 1.8 | Gemini 2.5 Pro |
| GPQA Diamond | 76.5 | 75.7 | 0.8 | Gemini 2.5 Pro |
| SWE-bench Verified | 70.2 | 71.4 | 1.2 | Gemini 3 Flash Vision |
| HumanEval | 87.7 | 84.5 | 3.2 | Gemini 2.5 Pro |
| MATH-500 | 86.8 | 87.5 | 0.7 | Gemini 3 Flash Vision |
| AIME 2025 | 76.1 | 82.4 | 6.3 | Gemini 3 Flash Vision |
| LiveCodeBench | 76.2 | 73.2 | 3.0 | Gemini 2.5 Pro |
| IFEval | 87.6 | 86.9 | 0.7 | Gemini 2.5 Pro |
| TruthfulQA | 82.8 | 85.5 | 2.7 | Gemini 3 Flash Vision |
| HellaSwag | 89.7 | 91.5 | 1.8 | Gemini 3 Flash Vision |
| MMMU | 80.5 | 80.3 | 0.2 | Gemini 2.5 Pro |
| Arena Elo | 1455.0 | 1430.3 | 24.7 | 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 Gemini 3 Flash Vision costs about $31.83. Gemini 2.5 Pro is roughly 19% cheaper than Gemini 3 Flash Vision. At high volume, that gap compounds quickly, so price should carry real weight unless the quality difference is decisive.
Gemini 3 Flash Vision has the larger context window at 400,000 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 7, Gemini 3 Flash Vision wins 5, and 0 are tied. On the index average, Gemini 3 Flash Vision leads Gemini 2.5 Pro by 0.3 points (81.9 versus 81.6).
The price picture favours Gemini 2.5 Pro. The context picture favours Gemini 3 Flash 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 Gemini 3 Flash 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.
- The workload needs multi-step reasoning.
Choose Gemini 3 Flash Vision if
- You want the higher average benchmark score in this index.
- You need the larger 400,000-token context window.
- You need the larger 32,768-token output limit.
FAQ
Is Gemini 2.5 Pro better than Gemini 3 Flash Vision?
On the index average, Gemini 3 Flash Vision leads Gemini 2.5 Pro by 0.3 points (81.9 versus 81.6). The better choice depends on price, context and your task. Gemini 2.5 Pro wins 7 benchmarks, Gemini 3 Flash Vision wins 5.
Which is cheaper, Gemini 2.5 Pro or Gemini 3 Flash Vision?
Gemini 2.5 Pro is cheaper on a blended 3:1 basis at about $25.86 per million tokens, versus $31.83 for Gemini 3 Flash Vision.
Which has the larger context window?
Gemini 3 Flash Vision has the larger context window at 400,000 tokens. Gemini 2.5 Pro has 200,000 tokens.
Are these models open weights?
Gemini 2.5 Pro is proprietary; Gemini 3 Flash Vision is proprietary.
Which should I choose for production?
If you need a single default, start with Gemini 3 Flash 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.