Grok 4 Pro vs o4 Pro: which model should you choose?
We compared Grok 4 Pro and o4 Pro on price, context window and 12 benchmarks. o4 Pro has the stronger average benchmark score; o4 Pro is cheaper on a blended 3:1 basis.
Grok 4 Pro
Grok 4 Pro is a frontier model from xAI. It offers a 1,000,000-token context window, costs $19.00 per million input tokens and $77.72 per million output tokens, and averages 85.4 across the index's benchmark suite.
- Input
- $19.00 / 1M
- Output
- $77.72 / 1M
- Context
- 1,000,000
- Avg score
- 85.4
- Open weights
- No
o4 Pro
o4 Pro is a frontier model from OpenAI. It offers a 1,000,000-token context window, costs $19.37 per million input tokens and $70.19 per million output tokens, and averages 87.3 across the index's benchmark suite.
- Input
- $19.37 / 1M
- Output
- $70.19 / 1M
- Context
- 1,000,000
- Avg score
- 87.3
- Open weights
- No
Specification comparison
| Spec | Grok 4 Pro | o4 Pro | Edge |
|---|---|---|---|
| Input price / 1M | $19.00 | $19.37 | A |
| Output price / 1M | $77.72 | $70.19 | B |
| Context window | 1,000,000 | 1,000,000 | Tie |
| Max output | 128,000 | 16,384 | A |
| Average score | 85.4 | 87.3 | B |
| Arena Elo | 1487.5 | 1471.2 | A |
| Open weights | No | No | Tie |
Benchmark comparison
Grok 4 Pro wins 4, o4 Pro wins 8, and 0 benchmarks are tied. The table shows the modelled score for each model and the gap.
| Benchmark | Grok 4 Pro | o4 Pro | Gap | Winner |
|---|---|---|---|---|
| MMLU-Pro | 84.9 | 87.7 | 2.8 | o4 Pro |
| GPQA Diamond | 79.2 | 82.7 | 3.5 | o4 Pro |
| SWE-bench Verified | 74.7 | 78.5 | 3.8 | o4 Pro |
| HumanEval | 89.7 | 92.1 | 2.4 | o4 Pro |
| MATH-500 | 92.3 | 89.8 | 2.5 | Grok 4 Pro |
| AIME 2025 | 85.4 | 89.9 | 4.5 | o4 Pro |
| LiveCodeBench | 77.8 | 81.8 | 4.0 | o4 Pro |
| IFEval | 91.3 | 90.9 | 0.4 | Grok 4 Pro |
| TruthfulQA | 86.0 | 87.9 | 1.9 | o4 Pro |
| HellaSwag | 92.8 | 94.4 | 1.6 | o4 Pro |
| MMMU | 84.9 | 84.1 | 0.8 | Grok 4 Pro |
| Arena Elo | 1487.5 | 1471.2 | 16.3 | Grok 4 Pro |
Price analysis
On a blended 3:1 input-to-output basis, Grok 4 Pro costs about $33.68 per million tokens and o4 Pro costs about $32.08. o4 Pro is roughly 5% cheaper than Grok 4 Pro. At high volume, that gap compounds quickly, so price should carry real weight unless the quality difference is decisive.
Both models list a 1,000,000-token context window. That is enough for long documents, large codebases and multi-step agent traces.
Verdict
Across 12 shared benchmarks, Grok 4 Pro wins 4, o4 Pro wins 8, and 0 are tied. On the index average, o4 Pro leads Grok 4 Pro by 1.9 points (87.3 versus 85.4).
The price picture favours o4 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 o4 Pro for quality-sensitive work, and check whether its price holds at your expected volume before committing.
Choose Grok 4 Pro if
- You need the larger 128,000-token output limit.
Choose o4 Pro if
- You want the higher average benchmark score in this index.
- Unit cost matters and you want the cheaper blended price.
FAQ
Is Grok 4 Pro better than o4 Pro?
On the index average, o4 Pro leads Grok 4 Pro by 1.9 points (87.3 versus 85.4). The better choice depends on price, context and your task. Grok 4 Pro wins 4 benchmarks, o4 Pro wins 8.
Which is cheaper, Grok 4 Pro or o4 Pro?
o4 Pro is cheaper on a blended 3:1 basis at about $32.08 per million tokens, versus $33.68 for Grok 4 Pro.
Which has the larger context window?
Both models list a 1,000,000-token context window.
Are these models open weights?
Grok 4 Pro is proprietary; o4 Pro is proprietary.
Which should I choose for production?
If you need a single default, start with o4 Pro for quality-sensitive work, and check whether its price holds at your expected volume before committing.