Grok 3 Pro vs o3 Turbo: which model should you choose?
We compared Grok 3 Pro and o3 Turbo on price, context window and 12 benchmarks. Grok 3 Pro has the stronger average benchmark score; Grok 3 Pro is cheaper on a blended 3:1 basis.
Grok 3 Pro
Grok 3 Pro is a frontier model from xAI. It offers a 400,000-token context window, costs $16.61 per million input tokens and $73.49 per million output tokens, and averages 83.8 across the index's benchmark suite.
- Input
- $16.61 / 1M
- Output
- $73.49 / 1M
- Context
- 400,000
- Avg score
- 83.8
- Open weights
- No
o3 Turbo
o3 Turbo is a frontier model from OpenAI. It offers a 200,000-token context window, costs $16.63 per million input tokens and $83.71 per million output tokens, and averages 83.4 across the index's benchmark suite.
- Input
- $16.63 / 1M
- Output
- $83.71 / 1M
- Context
- 200,000
- Avg score
- 83.4
- Open weights
- No
Specification comparison
| Spec | Grok 3 Pro | o3 Turbo | Edge |
|---|---|---|---|
| Input price / 1M | $16.61 | $16.63 | A |
| Output price / 1M | $73.49 | $83.71 | A |
| Context window | 400,000 | 200,000 | A |
| Max output | 4,096 | 4,096 | Tie |
| Average score | 83.8 | 83.4 | A |
| Arena Elo | 1448.4 | 1456.2 | B |
| Open weights | No | No | Tie |
Benchmark comparison
Grok 3 Pro wins 6, o3 Turbo wins 5, and 1 benchmarks are tied. The table shows the modelled score for each model and the gap.
| Benchmark | Grok 3 Pro | o3 Turbo | Gap | Winner |
|---|---|---|---|---|
| MMLU-Pro | 83.5 | 82.7 | 0.8 | Grok 3 Pro |
| GPQA Diamond | 81.3 | 77.7 | 3.6 | Grok 3 Pro |
| SWE-bench Verified | 71.4 | 70.7 | 0.7 | Grok 3 Pro |
| HumanEval | 89.9 | 87.4 | 2.5 | Grok 3 Pro |
| MATH-500 | 87.0 | 90.6 | 3.6 | o3 Turbo |
| AIME 2025 | 85.5 | 83.0 | 2.5 | Grok 3 Pro |
| LiveCodeBench | 80.7 | 80.7 | 0.0 | Tie |
| IFEval | 88.6 | 89.1 | 0.5 | o3 Turbo |
| TruthfulQA | 84.6 | 83.6 | 1.0 | Grok 3 Pro |
| HellaSwag | 90.7 | 91.8 | 1.1 | o3 Turbo |
| MMMU | 78.9 | 79.7 | 0.8 | o3 Turbo |
| Arena Elo | 1448.4 | 1456.2 | 7.8 | o3 Turbo |
Price analysis
On a blended 3:1 input-to-output basis, Grok 3 Pro costs about $30.83 per million tokens and o3 Turbo costs about $33.40. Grok 3 Pro is roughly 8% cheaper than o3 Turbo. At high volume, that gap compounds quickly, so price should carry real weight unless the quality difference is decisive.
Grok 3 Pro has the larger context window at 400,000 tokens, compared with 200,000 for o3 Turbo. That matters for long documents, large codebases and multi-step agent traces.
Verdict
Across 12 shared benchmarks, Grok 3 Pro wins 6, o3 Turbo wins 5, and 1 are tied. On the index average, Grok 3 Pro leads o3 Turbo by 0.4 points (83.8 versus 83.4).
The price picture favours Grok 3 Pro. The context picture favours Grok 3 Pro. 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 Pro for quality-sensitive work, and check whether its price holds at your expected volume before committing.
Choose Grok 3 Pro 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 400,000-token context window.
Choose o3 Turbo if
- You prefer OpenAI's tooling or already use it.
FAQ
Is Grok 3 Pro better than o3 Turbo?
On the index average, Grok 3 Pro leads o3 Turbo by 0.4 points (83.8 versus 83.4). The better choice depends on price, context and your task. Grok 3 Pro wins 6 benchmarks, o3 Turbo wins 5.
Which is cheaper, Grok 3 Pro or o3 Turbo?
Grok 3 Pro is cheaper on a blended 3:1 basis at about $30.83 per million tokens, versus $33.40 for o3 Turbo.
Which has the larger context window?
Grok 3 Pro has the larger context window at 400,000 tokens. o3 Turbo has 200,000 tokens.
Are these models open weights?
Grok 3 Pro is proprietary; o3 Turbo is proprietary.
Which should I choose for production?
If you need a single default, start with Grok 3 Pro for quality-sensitive work, and check whether its price holds at your expected volume before committing.