Side-by-side comparison of AI model specs, benchmarks, and pricing.
| Spec | GPT-4.1 OpenAI | GPT-5.1 OpenAI |
|---|---|---|
| Tier | mid | frontier |
| Release Date | 2025-04-14 | 2025-11-13 |
| Context Window | 1048K | 400K |
| Max Output | 33K | 128K |
| Input Price (/1M) | $2 | $1.25 |
| Output Price (/1M) | $8 | $10 |
| Arena Elo | 1,413 | 1,458 |
| MMLU | 86% | 91.5% |
| GPQA | 66.3% | 88.1% |
| MATH | 73.8% | — |
| HumanEval | 92.4% | 96% |
| SWE-bench | 54.6% | 62% |
| Capabilities | vision, tool-use, code | vision, tool-use, code, reasoning, agentic |