Claude Sonnet 4.5 Pro vs Qwen3-Max Reasoning: which model should you choose?
We compared Claude Sonnet 4.5 Pro and Qwen3-Max Reasoning on price, context window and 12 benchmarks. Claude Sonnet 4.5 Pro has the stronger average benchmark score; Qwen3-Max Reasoning is cheaper on a blended 3:1 basis.
Claude Sonnet 4.5 Pro
Claude Sonnet 4.5 Pro is a frontier model from Anthropic. It offers a 1,000,000-token context window, costs $18.73 per million input tokens and $82.29 per million output tokens, and averages 86.7 across the index's benchmark suite.
- Input
- $18.73 / 1M
- Output
- $82.29 / 1M
- Context
- 1,000,000
- Avg score
- 86.7
- Open weights
- No
Qwen3-Max Reasoning
Qwen3-Max Reasoning is a frontier model from Alibaba Cloud. It offers a 2,000,000-token context window, costs $18.12 per million input tokens and $81.94 per million output tokens, and averages 85.9 across the index's benchmark suite.
- Input
- $18.12 / 1M
- Output
- $81.94 / 1M
- Context
- 2,000,000
- Avg score
- 85.9
- Open weights
- No
Specification comparison
| Spec | Claude Sonnet 4.5 Pro | Qwen3-Max Reasoning | Edge |
|---|---|---|---|
| Input price / 1M | $18.73 | $18.12 | B |
| Output price / 1M | $82.29 | $81.94 | B |
| Context window | 1,000,000 | 2,000,000 | B |
| Max output | 16,384 | 8,192 | A |
| Average score | 86.7 | 85.9 | A |
| Arena Elo | 1469.0 | 1461.0 | A |
| Open weights | No | No | Tie |
Benchmark comparison
Claude Sonnet 4.5 Pro wins 8, Qwen3-Max Reasoning wins 4, and 0 benchmarks are tied. The table shows the modelled score for each model and the gap.
| Benchmark | Claude Sonnet 4.5 Pro | Qwen3-Max Reasoning | Gap | Winner |
|---|---|---|---|---|
| MMLU-Pro | 86.3 | 88.1 | 1.8 | Qwen3-Max Reasoning |
| GPQA Diamond | 83.1 | 79.8 | 3.3 | Claude Sonnet 4.5 Pro |
| SWE-bench Verified | 73.9 | 75.3 | 1.4 | Qwen3-Max Reasoning |
| HumanEval | 92.7 | 92.6 | 0.1 | Claude Sonnet 4.5 Pro |
| MATH-500 | 90.1 | 93.0 | 2.9 | Qwen3-Max Reasoning |
| AIME 2025 | 88.4 | 83.1 | 5.3 | Claude Sonnet 4.5 Pro |
| LiveCodeBench | 81.9 | 78.0 | 3.9 | Claude Sonnet 4.5 Pro |
| IFEval | 94.1 | 92.2 | 1.9 | Claude Sonnet 4.5 Pro |
| TruthfulQA | 86.1 | 88.8 | 2.7 | Qwen3-Max Reasoning |
| HellaSwag | 92.6 | 91.5 | 1.1 | Claude Sonnet 4.5 Pro |
| MMMU | 84.5 | 82.3 | 2.2 | Claude Sonnet 4.5 Pro |
| Arena Elo | 1469.0 | 1461.0 | 8.0 | Claude Sonnet 4.5 Pro |
Price analysis
On a blended 3:1 input-to-output basis, Claude Sonnet 4.5 Pro costs about $34.62 per million tokens and Qwen3-Max Reasoning costs about $34.08. Qwen3-Max Reasoning is roughly 2% cheaper than Claude Sonnet 4.5 Pro. At high volume, that gap compounds quickly, so price should carry real weight unless the quality difference is decisive.
Qwen3-Max Reasoning has the larger context window at 2,000,000 tokens, compared with 1,000,000 for Claude Sonnet 4.5 Pro. That matters for long documents, large codebases and multi-step agent traces.
Verdict
Across 12 shared benchmarks, Claude Sonnet 4.5 Pro wins 8, Qwen3-Max Reasoning wins 4, and 0 are tied. On the index average, Claude Sonnet 4.5 Pro leads Qwen3-Max Reasoning by 0.8 points (86.7 versus 85.9).
The price picture favours Qwen3-Max Reasoning. The context picture favours Qwen3-Max 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 Claude Sonnet 4.5 Pro for quality-sensitive work and Qwen3-Max Reasoning for high-volume, well-scoped tasks. Run both on a sample of your own traffic before locking in a choice.
Choose Claude Sonnet 4.5 Pro if
- You want the higher average benchmark score in this index.
- You need the larger 16,384-token output limit.
Choose Qwen3-Max Reasoning if
- Unit cost matters and you want the cheaper blended price.
- You need the larger 2,000,000-token context window.
FAQ
Is Claude Sonnet 4.5 Pro better than Qwen3-Max Reasoning?
On the index average, Claude Sonnet 4.5 Pro leads Qwen3-Max Reasoning by 0.8 points (86.7 versus 85.9). The better choice depends on price, context and your task. Claude Sonnet 4.5 Pro wins 8 benchmarks, Qwen3-Max Reasoning wins 4.
Which is cheaper, Claude Sonnet 4.5 Pro or Qwen3-Max Reasoning?
Qwen3-Max Reasoning is cheaper on a blended 3:1 basis at about $34.08 per million tokens, versus $34.62 for Claude Sonnet 4.5 Pro.
Which has the larger context window?
Qwen3-Max Reasoning has the larger context window at 2,000,000 tokens. Claude Sonnet 4.5 Pro has 1,000,000 tokens.
Are these models open weights?
Claude Sonnet 4.5 Pro is proprietary; Qwen3-Max Reasoning is proprietary.
Which should I choose for production?
If you need a single default, start with Claude Sonnet 4.5 Pro for quality-sensitive work and Qwen3-Max Reasoning for high-volume, well-scoped tasks. Run both on a sample of your own traffic before locking in a choice.