OpenAI GPT-5-Codex | xAI Grok 4.20 Beta | |
|---|---|---|
| Overview | ||
| Company | OpenAI | xAI |
| Release date | Sep 15 2025 | Feb 17 2026 |
| Model type | — | — |
| Open source | No | No |
| Specifications | ||
Parameters | — | — |
Context window | — | — |
| Benchmarks | ||
| Timeline | ||
| Release gap | GPT-5-Codex shipped 155 days before Grok 4.20 Beta | |
GPT-5-Codex and Grok 4.20 Beta don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GPT-5-Codex shipped 155 days before Grok 4.20 Beta, 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-Codex and Grok 4.20 Beta don't publish scores on any of the same benchmarks.