Claude Opus 4.5 Turbo vs Grok 4 Pro: which model should you choose?
We compared Claude Opus 4.5 Turbo and Grok 4 Pro on price, context window and 12 benchmarks. Claude Opus 4.5 Turbo has the stronger average benchmark score; Grok 4 Pro is cheaper on a blended 3:1 basis.
Claude Opus 4.5 Turbo
Claude Opus 4.5 Turbo is a frontier model from Anthropic. It offers a 2,000,000-token context window, costs $19.57 per million input tokens and $106.60 per million output tokens, and averages 85.7 across the index's benchmark suite.
- Input
- $19.57 / 1M
- Output
- $106.60 / 1M
- Context
- 2,000,000
- Avg score
- 85.7
- Open weights
- No
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
Specification comparison
| Spec | Claude Opus 4.5 Turbo | Grok 4 Pro | Edge |
|---|---|---|---|
| Input price / 1M | $19.57 | $19.00 | B |
| Output price / 1M | $106.60 | $77.72 | B |
| Context window | 2,000,000 | 1,000,000 | A |
| Max output | 65,536 | 128,000 | B |
| Average score | 85.7 | 85.4 | A |
| Arena Elo | 1469.3 | 1487.5 | B |
| Open weights | No | No | Tie |
Benchmark comparison
Claude Opus 4.5 Turbo wins 8, Grok 4 Pro wins 3, and 1 benchmarks are tied. The table shows the modelled score for each model and the gap.
| Benchmark | Claude Opus 4.5 Turbo | Grok 4 Pro | Gap | Winner |
|---|---|---|---|---|
| MMLU-Pro | 85.8 | 84.9 | 0.9 | Claude Opus 4.5 Turbo |
| GPQA Diamond | 81.9 | 79.2 | 2.7 | Claude Opus 4.5 Turbo |
| SWE-bench Verified | 75.0 | 74.7 | 0.3 | Claude Opus 4.5 Turbo |
| HumanEval | 89.8 | 89.7 | 0.1 | Claude Opus 4.5 Turbo |
| MATH-500 | 93.2 | 92.3 | 0.9 | Claude Opus 4.5 Turbo |
| AIME 2025 | 87.2 | 85.4 | 1.8 | Claude Opus 4.5 Turbo |
| LiveCodeBench | 78.5 | 77.8 | 0.7 | Claude Opus 4.5 Turbo |
| IFEval | 92.2 | 91.3 | 0.9 | Claude Opus 4.5 Turbo |
| TruthfulQA | 85.5 | 86.0 | 0.5 | Grok 4 Pro |
| HellaSwag | 92.8 | 92.8 | 0.0 | Tie |
| MMMU | 80.5 | 84.9 | 4.4 | Grok 4 Pro |
| Arena Elo | 1469.3 | 1487.5 | 18.2 | Grok 4 Pro |
Price analysis
On a blended 3:1 input-to-output basis, Claude Opus 4.5 Turbo costs about $41.33 per million tokens and Grok 4 Pro costs about $33.68. Grok 4 Pro is roughly 19% cheaper than Claude Opus 4.5 Turbo. At high volume, that gap compounds quickly, so price should carry real weight unless the quality difference is decisive.
Claude Opus 4.5 Turbo has the larger context window at 2,000,000 tokens, compared with 1,000,000 for Grok 4 Pro. That matters for long documents, large codebases and multi-step agent traces.
Verdict
Across 12 shared benchmarks, Claude Opus 4.5 Turbo wins 8, Grok 4 Pro wins 3, and 1 are tied. On the index average, Claude Opus 4.5 Turbo leads Grok 4 Pro by 0.3 points (85.7 versus 85.4).
The price picture favours Grok 4 Pro. The context picture favours Claude Opus 4.5 Turbo. 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 Claude Opus 4.5 Turbo for quality-sensitive work and Grok 4 Pro for high-volume, well-scoped tasks. Run both on a sample of your own traffic before locking in a choice.
Choose Claude Opus 4.5 Turbo if
- You want the higher average benchmark score in this index.
- You need the larger 2,000,000-token context window.
Choose Grok 4 Pro if
- Unit cost matters and you want the cheaper blended price.
- You need the larger 128,000-token output limit.
FAQ
Is Claude Opus 4.5 Turbo better than Grok 4 Pro?
On the index average, Claude Opus 4.5 Turbo leads Grok 4 Pro by 0.3 points (85.7 versus 85.4). The better choice depends on price, context and your task. Claude Opus 4.5 Turbo wins 8 benchmarks, Grok 4 Pro wins 3.
Which is cheaper, Claude Opus 4.5 Turbo or Grok 4 Pro?
Grok 4 Pro is cheaper on a blended 3:1 basis at about $33.68 per million tokens, versus $41.33 for Claude Opus 4.5 Turbo.
Which has the larger context window?
Claude Opus 4.5 Turbo has the larger context window at 2,000,000 tokens. Grok 4 Pro has 1,000,000 tokens.
Are these models open weights?
Claude Opus 4.5 Turbo is proprietary; Grok 4 Pro is proprietary.
Which should I choose for production?
If you need a single default, start with Claude Opus 4.5 Turbo for quality-sensitive work and Grok 4 Pro for high-volume, well-scoped tasks. Run both on a sample of your own traffic before locking in a choice.