Side-by-side comparison of AI model specs, benchmarks, and pricing.
| Spec | Claude Opus 4.5 Anthropic | GPT-5.2 OpenAI |
|---|---|---|
| Tier | frontier | frontier |
| Release Date | 2025-11-01 | 2025-12-11 |
| Context Window | 200K | 400K |
| Max Output | 64K | 128K |
| Input Price (/1M) | $5 | $1.75 |
| Output Price (/1M) | $25 | $14 |
| Arena Elo | 1,467 | 1,438 |
| MMLU | 90.5% | 92.8% |
| GPQA | 87% | 90.3% |
| MATH | 92% | 98% |
| HumanEval | 96% | 97% |
| SWE-bench | 64% | 68% |
| Capabilities | vision, tool-use, code, extended-thinking, agentic | vision, tool-use, code, reasoning, agentic |