OpenAI GPT-5.2 vs xAI Grok 4 Fast — side-by-side specs.
OpenAI GPT-5.2 | xAI Grok 4 Fast | |
|---|---|---|
| Overview | ||
| Company | OpenAI | xAI |
| Release date | Dec 11 2025 | Sep 2025 |
| Model type | — | — |
| Open source | No | No |
| Specifications | ||
Parameters | — | — |
Context window | — | — |
| Benchmarks | ||
Coding SWE-Bench VerifiedReal coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | 80% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 92.4% | — |
| Timeline | ||
| Release gap | Grok 4 Fast shipped 101 days before GPT-5.2 | |
GPT-5.2 and Grok 4 Fast don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Grok 4 Fast shipped 101 days before GPT-5.2, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
Direct benchmark comparisons are unavailable — GPT-5.2 and Grok 4 Fast don't publish scores on any of the same benchmarks.