Gemini 3 Flash Reasoning vs Grok 3 Max: which model should you choose?
We compared Gemini 3 Flash Reasoning and Grok 3 Max on price, context window and 12 benchmarks. Grok 3 Max has the stronger average benchmark score; Gemini 3 Flash Reasoning is cheaper on a blended 3:1 basis.
Gemini 3 Flash Reasoning
Gemini 3 Flash Reasoning is a frontier model from Google DeepMind. It offers a 128,000-token context window, costs $17.05 per million input tokens and $66.77 per million output tokens, and averages 83.7 across the index's benchmark suite.
- Input
- $17.05 / 1M
- Output
- $66.77 / 1M
- Context
- 128,000
- Avg score
- 83.7
- Open weights
- No
Grok 3 Max
Grok 3 Max is a frontier model from xAI. It offers a 2,000,000-token context window, costs $17.66 per million input tokens and $89.12 per million output tokens, and averages 85.9 across the index's benchmark suite.
- Input
- $17.66 / 1M
- Output
- $89.12 / 1M
- Context
- 2,000,000
- Avg score
- 85.9
- Open weights
- No
Specification comparison
| Spec | Gemini 3 Flash Reasoning | Grok 3 Max | Edge |
|---|---|---|---|
| Input price / 1M | $17.05 | $17.66 | A |
| Output price / 1M | $66.77 | $89.12 | A |
| Context window | 128,000 | 2,000,000 | B |
| Max output | 32,768 | 32,768 | Tie |
| Average score | 83.7 | 85.9 | B |
| Arena Elo | 1446.9 | 1475.8 | B |
| Open weights | No | No | Tie |
Benchmark comparison
Gemini 3 Flash Reasoning wins 2, Grok 3 Max wins 10, and 0 benchmarks are tied. The table shows the modelled score for each model and the gap.
| Benchmark | Gemini 3 Flash Reasoning | Grok 3 Max | Gap | Winner |
|---|---|---|---|---|
| MMLU-Pro | 87.2 | 87.3 | 0.1 | Grok 3 Max |
| GPQA Diamond | 81.8 | 80.9 | 0.9 | Gemini 3 Flash Reasoning |
| SWE-bench Verified | 72.5 | 73.6 | 1.1 | Grok 3 Max |
| HumanEval | 86.9 | 91.9 | 5.0 | Grok 3 Max |
| MATH-500 | 86.2 | 91.9 | 5.7 | Grok 3 Max |
| AIME 2025 | 79.4 | 86.6 | 7.2 | Grok 3 Max |
| LiveCodeBench | 77.7 | 79.7 | 2.0 | Grok 3 Max |
| IFEval | 90.2 | 92.6 | 2.4 | Grok 3 Max |
| TruthfulQA | 86.6 | 86.7 | 0.1 | Grok 3 Max |
| HellaSwag | 92.2 | 91.8 | 0.4 | Gemini 3 Flash Reasoning |
| MMMU | 79.8 | 82.3 | 2.5 | Grok 3 Max |
| Arena Elo | 1446.9 | 1475.8 | 28.9 | Grok 3 Max |
Price analysis
On a blended 3:1 input-to-output basis, Gemini 3 Flash Reasoning costs about $29.48 per million tokens and Grok 3 Max costs about $35.53. Gemini 3 Flash Reasoning is roughly 17% cheaper than Grok 3 Max. At high volume, that gap compounds quickly, so price should carry real weight unless the quality difference is decisive.
Grok 3 Max has the larger context window at 2,000,000 tokens, compared with 128,000 for Gemini 3 Flash Reasoning. That matters for long documents, large codebases and multi-step agent traces.
Verdict
Across 12 shared benchmarks, Gemini 3 Flash Reasoning wins 2, Grok 3 Max wins 10, and 0 are tied. On the index average, Grok 3 Max leads Gemini 3 Flash Reasoning by 2.2 points (85.9 versus 83.7).
The price picture favours Gemini 3 Flash Reasoning. The context picture favours Grok 3 Max. 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 3 Max for quality-sensitive work and Gemini 3 Flash Reasoning for high-volume, well-scoped tasks. Run both on a sample of your own traffic before locking in a choice.
Choose Gemini 3 Flash Reasoning if
- Unit cost matters and you want the cheaper blended price.
Choose Grok 3 Max if
- You want the higher average benchmark score in this index.
- You need the larger 2,000,000-token context window.
FAQ
Is Gemini 3 Flash Reasoning better than Grok 3 Max?
On the index average, Grok 3 Max leads Gemini 3 Flash Reasoning by 2.2 points (85.9 versus 83.7). The better choice depends on price, context and your task. Gemini 3 Flash Reasoning wins 2 benchmarks, Grok 3 Max wins 10.
Which is cheaper, Gemini 3 Flash Reasoning or Grok 3 Max?
Gemini 3 Flash Reasoning is cheaper on a blended 3:1 basis at about $29.48 per million tokens, versus $35.53 for Grok 3 Max.
Which has the larger context window?
Grok 3 Max has the larger context window at 2,000,000 tokens. Gemini 3 Flash Reasoning has 128,000 tokens.
Are these models open weights?
Gemini 3 Flash Reasoning is proprietary; Grok 3 Max is proprietary.
Which should I choose for production?
If you need a single default, start with Grok 3 Max for quality-sensitive work and Gemini 3 Flash Reasoning for high-volume, well-scoped tasks. Run both on a sample of your own traffic before locking in a choice.