Gemini 3 Flash Pro vs GPT-4.1 Pro: which model should you choose?
We compared Gemini 3 Flash Pro and GPT-4.1 Pro on price, context window and 12 benchmarks. GPT-4.1 Pro has the stronger average benchmark score; Gemini 3 Flash Pro is cheaper on a blended 3:1 basis.
Gemini 3 Flash Pro
Gemini 3 Flash Pro is a frontier model from Google DeepMind. It offers a 400,000-token context window, costs $17.71 per million input tokens and $86.50 per million output tokens, and averages 84.8 across the index's benchmark suite.
- Input
- $17.71 / 1M
- Output
- $86.50 / 1M
- Context
- 400,000
- Avg score
- 84.8
- Open weights
- No
GPT-4.1 Pro
GPT-4.1 Pro is a frontier model from OpenAI. It offers a 400,000-token context window, costs $17.56 per million input tokens and $91.14 per million output tokens, and averages 85.2 across the index's benchmark suite.
- Input
- $17.56 / 1M
- Output
- $91.14 / 1M
- Context
- 400,000
- Avg score
- 85.2
- Open weights
- No
Specification comparison
| Spec | Gemini 3 Flash Pro | GPT-4.1 Pro | Edge |
|---|---|---|---|
| Input price / 1M | $17.71 | $17.56 | B |
| Output price / 1M | $86.50 | $91.14 | A |
| Context window | 400,000 | 400,000 | Tie |
| Max output | 4,096 | 8,192 | B |
| Average score | 84.8 | 85.2 | B |
| Arena Elo | 1469.2 | 1449.6 | A |
| Open weights | No | No | Tie |
Benchmark comparison
Gemini 3 Flash Pro wins 6, GPT-4.1 Pro wins 6, and 0 benchmarks are tied. The table shows the modelled score for each model and the gap.
| Benchmark | Gemini 3 Flash Pro | GPT-4.1 Pro | Gap | Winner |
|---|---|---|---|---|
| MMLU-Pro | 87.0 | 86.9 | 0.1 | Gemini 3 Flash Pro |
| GPQA Diamond | 77.7 | 78.2 | 0.5 | GPT-4.1 Pro |
| SWE-bench Verified | 73.3 | 77.3 | 4.0 | GPT-4.1 Pro |
| HumanEval | 89.9 | 91.9 | 2.0 | GPT-4.1 Pro |
| MATH-500 | 91.8 | 88.8 | 3.0 | Gemini 3 Flash Pro |
| AIME 2025 | 79.9 | 82.8 | 2.9 | GPT-4.1 Pro |
| LiveCodeBench | 80.2 | 76.7 | 3.5 | Gemini 3 Flash Pro |
| IFEval | 92.8 | 92.2 | 0.6 | Gemini 3 Flash Pro |
| TruthfulQA | 86.2 | 87.7 | 1.5 | GPT-4.1 Pro |
| HellaSwag | 90.6 | 93.7 | 3.1 | GPT-4.1 Pro |
| MMMU | 83.0 | 81.5 | 1.5 | Gemini 3 Flash Pro |
| Arena Elo | 1469.2 | 1449.6 | 19.6 | Gemini 3 Flash Pro |
Price analysis
On a blended 3:1 input-to-output basis, Gemini 3 Flash Pro costs about $34.91 per million tokens and GPT-4.1 Pro costs about $35.95. Gemini 3 Flash Pro is roughly 3% cheaper than GPT-4.1 Pro. At high volume, that gap compounds quickly, so price should carry real weight unless the quality difference is decisive.
Both models list a 400,000-token context window. That is enough for long documents, large codebases and multi-step agent traces.
Verdict
Across 12 shared benchmarks, Gemini 3 Flash Pro wins 6, GPT-4.1 Pro wins 6, and 0 are tied. On the index average, GPT-4.1 Pro leads Gemini 3 Flash Pro by 0.4 points (85.2 versus 84.8).
The price picture favours Gemini 3 Flash Pro. The context picture is effectively a tie. 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 GPT-4.1 Pro for quality-sensitive work and Gemini 3 Flash Pro for high-volume, well-scoped tasks. Run both on a sample of your own traffic before locking in a choice.
Choose Gemini 3 Flash Pro if
- Unit cost matters and you want the cheaper blended price.
Choose GPT-4.1 Pro if
- You want the higher average benchmark score in this index.
- You need the larger 8,192-token output limit.
FAQ
Is Gemini 3 Flash Pro better than GPT-4.1 Pro?
On the index average, GPT-4.1 Pro leads Gemini 3 Flash Pro by 0.4 points (85.2 versus 84.8). The better choice depends on price, context and your task. Gemini 3 Flash Pro wins 6 benchmarks, GPT-4.1 Pro wins 6.
Which is cheaper, Gemini 3 Flash Pro or GPT-4.1 Pro?
Gemini 3 Flash Pro is cheaper on a blended 3:1 basis at about $34.91 per million tokens, versus $35.95 for GPT-4.1 Pro.
Which has the larger context window?
Both models list a 400,000-token context window.
Are these models open weights?
Gemini 3 Flash Pro is proprietary; GPT-4.1 Pro is proprietary.
Which should I choose for production?
If you need a single default, start with GPT-4.1 Pro for quality-sensitive work and Gemini 3 Flash Pro for high-volume, well-scoped tasks. Run both on a sample of your own traffic before locking in a choice.