Claude Opus 4.5 Max vs GPT-5.2 Pro: which model should you choose?
We compared Claude Opus 4.5 Max and GPT-5.2 Pro on price, context window and 12 benchmarks. GPT-5.2 Pro has the stronger average benchmark score; GPT-5.2 Pro is cheaper on a blended 3:1 basis.
Claude Opus 4.5 Max
Claude Opus 4.5 Max is a frontier model from Anthropic. It offers a 1,000,000-token context window, costs $20.90 per million input tokens and $106.51 per million output tokens, and averages 87.8 across the index's benchmark suite.
- Input
- $20.90 / 1M
- Output
- $106.51 / 1M
- Context
- 1,000,000
- Avg score
- 87.8
- Open weights
- No
GPT-5.2 Pro
GPT-5.2 Pro is a frontier model from OpenAI. It offers a 2,000,000-token context window, costs $21.32 per million input tokens and $76.33 per million output tokens, and averages 89.6 across the index's benchmark suite.
- Input
- $21.32 / 1M
- Output
- $76.33 / 1M
- Context
- 2,000,000
- Avg score
- 89.6
- Open weights
- No
Specification comparison
| Spec | Claude Opus 4.5 Max | GPT-5.2 Pro | Edge |
|---|---|---|---|
| Input price / 1M | $20.90 | $21.32 | A |
| Output price / 1M | $106.51 | $76.33 | B |
| Context window | 1,000,000 | 2,000,000 | B |
| Max output | 16,384 | 32,768 | B |
| Average score | 87.8 | 89.6 | B |
| Arena Elo | 1501.9 | 1485.0 | A |
| Open weights | No | No | Tie |
Benchmark comparison
Claude Opus 4.5 Max wins 3, GPT-5.2 Pro wins 9, and 0 benchmarks are tied. The table shows the modelled score for each model and the gap.
| Benchmark | Claude Opus 4.5 Max | GPT-5.2 Pro | Gap | Winner |
|---|---|---|---|---|
| MMLU-Pro | 89.5 | 91.6 | 2.1 | GPT-5.2 Pro |
| GPQA Diamond | 84.6 | 83.2 | 1.4 | Claude Opus 4.5 Max |
| SWE-bench Verified | 79.5 | 81.7 | 2.2 | GPT-5.2 Pro |
| HumanEval | 91.7 | 96.8 | 5.1 | GPT-5.2 Pro |
| MATH-500 | 94.2 | 91.8 | 2.4 | Claude Opus 4.5 Max |
| AIME 2025 | 89.3 | 91.0 | 1.7 | GPT-5.2 Pro |
| LiveCodeBench | 80.6 | 84.6 | 4.0 | GPT-5.2 Pro |
| IFEval | 94.5 | 95.6 | 1.1 | GPT-5.2 Pro |
| TruthfulQA | 86.9 | 90.0 | 3.1 | GPT-5.2 Pro |
| HellaSwag | 93.0 | 95.3 | 2.3 | GPT-5.2 Pro |
| MMMU | 82.3 | 84.4 | 2.1 | GPT-5.2 Pro |
| Arena Elo | 1501.9 | 1485.0 | 16.9 | Claude Opus 4.5 Max |
Price analysis
On a blended 3:1 input-to-output basis, Claude Opus 4.5 Max costs about $42.30 per million tokens and GPT-5.2 Pro costs about $35.07. GPT-5.2 Pro is roughly 17% cheaper than Claude Opus 4.5 Max. At high volume, that gap compounds quickly, so price should carry real weight unless the quality difference is decisive.
GPT-5.2 Pro has the larger context window at 2,000,000 tokens, compared with 1,000,000 for Claude Opus 4.5 Max. That matters for long documents, large codebases and multi-step agent traces.
Verdict
Across 12 shared benchmarks, Claude Opus 4.5 Max wins 3, GPT-5.2 Pro wins 9, and 0 are tied. On the index average, GPT-5.2 Pro leads Claude Opus 4.5 Max by 1.8 points (89.6 versus 87.8).
The price picture favours GPT-5.2 Pro. The context picture favours GPT-5.2 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 GPT-5.2 Pro for quality-sensitive work, and check whether its price holds at your expected volume before committing.
Choose Claude Opus 4.5 Max if
- You prefer Anthropic's tooling or already use it.
Choose GPT-5.2 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 2,000,000-token context window.
- You need the larger 32,768-token output limit.
FAQ
Is Claude Opus 4.5 Max better than GPT-5.2 Pro?
On the index average, GPT-5.2 Pro leads Claude Opus 4.5 Max by 1.8 points (89.6 versus 87.8). The better choice depends on price, context and your task. Claude Opus 4.5 Max wins 3 benchmarks, GPT-5.2 Pro wins 9.
Which is cheaper, Claude Opus 4.5 Max or GPT-5.2 Pro?
GPT-5.2 Pro is cheaper on a blended 3:1 basis at about $35.07 per million tokens, versus $42.30 for Claude Opus 4.5 Max.
Which has the larger context window?
GPT-5.2 Pro has the larger context window at 2,000,000 tokens. Claude Opus 4.5 Max has 1,000,000 tokens.
Are these models open weights?
Claude Opus 4.5 Max is proprietary; GPT-5.2 Pro is proprietary.
Which should I choose for production?
If you need a single default, start with GPT-5.2 Pro for quality-sensitive work, and check whether its price holds at your expected volume before committing.