GPT-5.3-Codex vs Grok‑1
OpenAI GPT-5.3-Codex | SpaceXAI Grok‑1 | |
|---|---|---|
| Overview | ||
| Company | OpenAI | SpaceXAI |
| Release date | Feb 5 2026 | Nov 3 2023 |
| Access | Proprietary | Open Weight |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 24% | — |
Next.js coding Next.js EvalsVercel's open eval of how well AI coding agents build and migrate real Next.js apps — measured as the share of tasks the agent completes successfully. Higher is better. | 83% | — |
Community preference (code) Arena Elo (Code)Like the text arena, but people vote on which AI writes better code. The votes become a chess-style Elo rating on arena.ai. Higher is better. | 1406 | — |
| Timeline | ||
| Release gap | Grok‑1 shipped 825 days before GPT-5.3-Codex | |
Which is better: GPT-5.3-Codex or Grok‑1?
GPT-5.3-Codex and Grok‑1 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Grok‑1 shipped 825 days before GPT-5.3-Codex, so benchmark comparisons should account for the intervening progress.
GPT-5.3-Codex is proprietary, while Grok‑1 is open weight.
Direct benchmark comparisons are unavailable — GPT-5.3-Codex and Grok‑1 don't publish scores on any of the same benchmarks.
Frequently asked questions
GPT-5.3-Codex was released by OpenAI on Feb 5 2026.
Grok‑1 was released by SpaceXAI on Nov 3 2023.
GPT-5.3-Codex is a proprietary model released by OpenAI. Grok‑1 is an open weight model released by SpaceXAI.
Other comparisons
GPT-5.3-Codex vs Claude Sonnet 5Grok‑1 vs Claude Sonnet 5GPT-5.3-Codex vs Gemini OmniGrok‑1 vs Gemini OmniGPT-5.3-Codex vs Muse Spark 1.1Grok‑1 vs Muse Spark 1.1GPT-5.3-Codex vs DeepSeek-V4-ProGrok‑1 vs DeepSeek-V4-ProGPT-5.3-Codex vs Mistral Medium 3.5Grok‑1 vs Mistral Medium 3.5GPT-5.3-Codex vs Kimi K2.7 CodeGrok‑1 vs Kimi K2.7 Code