Side-by-side comparison of AI model specs, benchmarks, and pricing.
| Spec | Claude Opus 4.5 Anthropic | GPT-4.1 OpenAI |
|---|---|---|
| Tier | frontier | mid |
| Release Date | 2025-11-01 | 2025-04-14 |
| Context Window | 200K | 1048K |
| Max Output | 64K | 33K |
| Input Price (/1M) | $5 | $2 |
| Output Price (/1M) | $25 | $8 |
| Arena Elo | 1,467 | 1,413 |
| MMLU | 90.5% | 86% |
| GPQA | 87% | 66.3% |
| MATH | 92% | 73.8% |
| HumanEval | 96% | 92.4% |
| SWE-bench | 64% | 54.6% |
| Capabilities | vision, tool-use, code, extended-thinking, agentic | vision, tool-use, code |