Gemini 2.5 Pro Pro vs GPT-4.1 Reasoning: which model should you choose?
We compared Gemini 2.5 Pro Pro and GPT-4.1 Reasoning on price, context window and 12 benchmarks. GPT-4.1 Reasoning has the stronger average benchmark score; GPT-4.1 Reasoning is cheaper on a blended 3:1 basis.
Gemini 2.5 Pro Pro
Gemini 2.5 Pro Pro is a frontier model from Google DeepMind. It offers a 400,000-token context window, costs $17.16 per million input tokens and $90.89 per million output tokens, and averages 83.6 across the index's benchmark suite.
- Input
- $17.16 / 1M
- Output
- $90.89 / 1M
- Context
- 400,000
- Avg score
- 83.6
- Open weights
- No
GPT-4.1 Reasoning
GPT-4.1 Reasoning is a frontier model from OpenAI. It offers a 1,000,000-token context window, costs $16.97 per million input tokens and $82.05 per million output tokens, and averages 83.8 across the index's benchmark suite.
- Input
- $16.97 / 1M
- Output
- $82.05 / 1M
- Context
- 1,000,000
- Avg score
- 83.8
- Open weights
- No
Specification comparison
| Spec | Gemini 2.5 Pro Pro | GPT-4.1 Reasoning | Edge |
|---|---|---|---|
| Input price / 1M | $17.16 | $16.97 | B |
| Output price / 1M | $90.89 | $82.05 | B |
| Context window | 400,000 | 1,000,000 | B |
| Max output | 8,192 | 4,096 | A |
| Average score | 83.6 | 83.8 | B |
| Arena Elo | 1460.2 | 1466.7 | B |
| Open weights | No | No | Tie |
Benchmark comparison
Gemini 2.5 Pro Pro wins 6, GPT-4.1 Reasoning wins 6, and 0 benchmarks are tied. The table shows the modelled score for each model and the gap.
| Benchmark | Gemini 2.5 Pro Pro | GPT-4.1 Reasoning | Gap | Winner |
|---|---|---|---|---|
| MMLU-Pro | 85.2 | 87.3 | 2.1 | GPT-4.1 Reasoning |
| GPQA Diamond | 81.6 | 77.8 | 3.8 | Gemini 2.5 Pro Pro |
| SWE-bench Verified | 72.1 | 73.1 | 1.0 | GPT-4.1 Reasoning |
| HumanEval | 88.4 | 88.8 | 0.4 | GPT-4.1 Reasoning |
| MATH-500 | 86.8 | 89.1 | 2.3 | GPT-4.1 Reasoning |
| AIME 2025 | 83.3 | 82.1 | 1.2 | Gemini 2.5 Pro Pro |
| LiveCodeBench | 76.5 | 80.5 | 4.0 | GPT-4.1 Reasoning |
| IFEval | 92.0 | 91.6 | 0.4 | Gemini 2.5 Pro Pro |
| TruthfulQA | 85.5 | 84.3 | 1.2 | Gemini 2.5 Pro Pro |
| HellaSwag | 90.6 | 89.4 | 1.2 | Gemini 2.5 Pro Pro |
| MMMU | 78.1 | 77.5 | 0.6 | Gemini 2.5 Pro Pro |
| Arena Elo | 1460.2 | 1466.7 | 6.5 | GPT-4.1 Reasoning |
Price analysis
On a blended 3:1 input-to-output basis, Gemini 2.5 Pro Pro costs about $35.59 per million tokens and GPT-4.1 Reasoning costs about $33.24. GPT-4.1 Reasoning is roughly 7% cheaper than Gemini 2.5 Pro Pro. At high volume, that gap compounds quickly, so price should carry real weight unless the quality difference is decisive.
GPT-4.1 Reasoning has the larger context window at 1,000,000 tokens, compared with 400,000 for Gemini 2.5 Pro Pro. That matters for long documents, large codebases and multi-step agent traces.
Verdict
Across 12 shared benchmarks, Gemini 2.5 Pro Pro wins 6, GPT-4.1 Reasoning wins 6, and 0 are tied. On the index average, GPT-4.1 Reasoning leads Gemini 2.5 Pro Pro by 0.2 points (83.8 versus 83.6).
The price picture favours GPT-4.1 Reasoning. The context picture favours GPT-4.1 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 GPT-4.1 Reasoning for quality-sensitive work, and check whether its price holds at your expected volume before committing.
Choose Gemini 2.5 Pro Pro if
- You need the larger 8,192-token output limit.
Choose GPT-4.1 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.
FAQ
Is Gemini 2.5 Pro Pro better than GPT-4.1 Reasoning?
On the index average, GPT-4.1 Reasoning leads Gemini 2.5 Pro Pro by 0.2 points (83.8 versus 83.6). The better choice depends on price, context and your task. Gemini 2.5 Pro Pro wins 6 benchmarks, GPT-4.1 Reasoning wins 6.
Which is cheaper, Gemini 2.5 Pro Pro or GPT-4.1 Reasoning?
GPT-4.1 Reasoning is cheaper on a blended 3:1 basis at about $33.24 per million tokens, versus $35.59 for Gemini 2.5 Pro Pro.
Which has the larger context window?
GPT-4.1 Reasoning has the larger context window at 1,000,000 tokens. Gemini 2.5 Pro Pro has 400,000 tokens.
Are these models open weights?
Gemini 2.5 Pro Pro is proprietary; GPT-4.1 Reasoning is proprietary.
Which should I choose for production?
If you need a single default, start with GPT-4.1 Reasoning for quality-sensitive work, and check whether its price holds at your expected volume before committing.