Gemini 3 Pro Turbo vs Grok 4 Reasoning: which model should you choose?
We compared Gemini 3 Pro Turbo and Grok 4 Reasoning on price, context window and 12 benchmarks. Grok 4 Reasoning has the stronger average benchmark score; Gemini 3 Pro Turbo is cheaper on a blended 3:1 basis.
Gemini 3 Pro Turbo
Gemini 3 Pro Turbo is a frontier model from Google DeepMind. It offers a 400,000-token context window, costs $19.62 per million input tokens and $89.91 per million output tokens, and averages 86.4 across the index's benchmark suite.
- Input
- $19.62 / 1M
- Output
- $89.91 / 1M
- Context
- 400,000
- Avg score
- 86.4
- Open weights
- No
Grok 4 Reasoning
Grok 4 Reasoning is a frontier model from xAI. It offers a 2,000,000-token context window, costs $19.67 per million input tokens and $93.29 per million output tokens, and averages 87.8 across the index's benchmark suite.
- Input
- $19.67 / 1M
- Output
- $93.29 / 1M
- Context
- 2,000,000
- Avg score
- 87.8
- Open weights
- No
Specification comparison
| Spec | Gemini 3 Pro Turbo | Grok 4 Reasoning | Edge |
|---|---|---|---|
| Input price / 1M | $19.62 | $19.67 | A |
| Output price / 1M | $89.91 | $93.29 | A |
| Context window | 400,000 | 2,000,000 | B |
| Max output | 16,384 | 65,536 | B |
| Average score | 86.4 | 87.8 | B |
| Arena Elo | 1494.9 | 1487.6 | A |
| Open weights | No | No | Tie |
Benchmark comparison
Gemini 3 Pro Turbo wins 2, Grok 4 Reasoning wins 9, and 1 benchmarks are tied. The table shows the modelled score for each model and the gap.
| Benchmark | Gemini 3 Pro Turbo | Grok 4 Reasoning | Gap | Winner |
|---|---|---|---|---|
| MMLU-Pro | 85.6 | 88.5 | 2.9 | Grok 4 Reasoning |
| GPQA Diamond | 81.0 | 81.9 | 0.9 | Grok 4 Reasoning |
| SWE-bench Verified | 77.4 | 78.0 | 0.6 | Grok 4 Reasoning |
| HumanEval | 90.3 | 93.8 | 3.5 | Grok 4 Reasoning |
| MATH-500 | 92.4 | 94.4 | 2.0 | Grok 4 Reasoning |
| AIME 2025 | 82.8 | 85.6 | 2.8 | Grok 4 Reasoning |
| LiveCodeBench | 82.7 | 85.1 | 2.4 | Grok 4 Reasoning |
| IFEval | 93.4 | 93.4 | 0.0 | Tie |
| TruthfulQA | 87.8 | 89.4 | 1.6 | Grok 4 Reasoning |
| HellaSwag | 94.6 | 95.2 | 0.6 | Grok 4 Reasoning |
| MMMU | 82.7 | 80.8 | 1.9 | Gemini 3 Pro Turbo |
| Arena Elo | 1494.9 | 1487.6 | 7.3 | Gemini 3 Pro Turbo |
Price analysis
On a blended 3:1 input-to-output basis, Gemini 3 Pro Turbo costs about $37.19 per million tokens and Grok 4 Reasoning costs about $38.08. Gemini 3 Pro Turbo is roughly 2% cheaper than Grok 4 Reasoning. At high volume, that gap compounds quickly, so price should carry real weight unless the quality difference is decisive.
Grok 4 Reasoning has the larger context window at 2,000,000 tokens, compared with 400,000 for Gemini 3 Pro Turbo. That matters for long documents, large codebases and multi-step agent traces.
Verdict
Across 12 shared benchmarks, Gemini 3 Pro Turbo wins 2, Grok 4 Reasoning wins 9, and 1 are tied. On the index average, Grok 4 Reasoning leads Gemini 3 Pro Turbo by 1.4 points (87.8 versus 86.4).
The price picture favours Gemini 3 Pro Turbo. The context picture favours Grok 4 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 Grok 4 Reasoning for quality-sensitive work and Gemini 3 Pro Turbo for high-volume, well-scoped tasks. Run both on a sample of your own traffic before locking in a choice.
Choose Gemini 3 Pro Turbo if
- Unit cost matters and you want the cheaper blended price.
Choose Grok 4 Reasoning if
- You want the higher average benchmark score in this index.
- You need the larger 2,000,000-token context window.
- You need the larger 65,536-token output limit.
FAQ
Is Gemini 3 Pro Turbo better than Grok 4 Reasoning?
On the index average, Grok 4 Reasoning leads Gemini 3 Pro Turbo by 1.4 points (87.8 versus 86.4). The better choice depends on price, context and your task. Gemini 3 Pro Turbo wins 2 benchmarks, Grok 4 Reasoning wins 9.
Which is cheaper, Gemini 3 Pro Turbo or Grok 4 Reasoning?
Gemini 3 Pro Turbo is cheaper on a blended 3:1 basis at about $37.19 per million tokens, versus $38.08 for Grok 4 Reasoning.
Which has the larger context window?
Grok 4 Reasoning has the larger context window at 2,000,000 tokens. Gemini 3 Pro Turbo has 400,000 tokens.
Are these models open weights?
Gemini 3 Pro Turbo is proprietary; Grok 4 Reasoning is proprietary.
Which should I choose for production?
If you need a single default, start with Grok 4 Reasoning for quality-sensitive work and Gemini 3 Pro Turbo for high-volume, well-scoped tasks. Run both on a sample of your own traffic before locking in a choice.