Side-by-side comparison of AI model specs, benchmarks, and pricing.
| Spec | GPT-5.3 Codex OpenAI | Grok 4.1 xAI |
|---|---|---|
| Tier | frontier | frontier |
| Release Date | 2026-02-05 | 2025-11-17 |
| Context Window | 400K | 2000K |
| Max Output | 128K | 16K |
| Input Price (/1M) | $1.75 | $0.2 |
| Output Price (/1M) | $14 | $0.5 |
| Arena Elo | 1,480 | 1,465 |
| MMLU | 93% | 90.2% |
| GPQA | 81% | 88% |
| MATH | 96% | — |
| HumanEval | 93% | 92% |
| SWE-bench | 80% | 65% |
| AIME | 94% | 78% |
| SimpleQA | 58% | 38% |
| Capabilities | vision, tool-use, code, reasoning, agentic | vision, tool-use, code, reasoning |