GPT-4o vs Grok 4 Heavy
OpenAI GPT-4o | SpaceXAI Grok 4 Heavy | |
|---|---|---|
| Overview | ||
| Company | OpenAI | SpaceXAI |
| Release date | May 13 2024 | Jul 9 2025 |
| Access | Proprietary | Proprietary |
| 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. | 12% | — |
| Timeline | ||
| Release gap | GPT-4o shipped 422 days before Grok 4 Heavy | |
Which is better: GPT-4o or Grok 4 Heavy?
GPT-4o and Grok 4 Heavy don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GPT-4o shipped 422 days before Grok 4 Heavy, 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-4o and Grok 4 Heavy don't publish scores on any of the same benchmarks.
Frequently asked questions
GPT-4o was released by OpenAI on May 13 2024.
Grok 4 Heavy was released by SpaceXAI on Jul 9 2025.
Other comparisons
GPT-4o vs Claude Sonnet 5Grok 4 Heavy vs Claude Sonnet 5GPT-4o vs Gemini OmniGrok 4 Heavy vs Gemini OmniGPT-4o vs Muse Spark 1.1Grok 4 Heavy vs Muse Spark 1.1GPT-4o vs DeepSeek-V4-ProGrok 4 Heavy vs DeepSeek-V4-ProGPT-4o vs Mistral Medium 3.5Grok 4 Heavy vs Mistral Medium 3.5GPT-4o vs Kimi K2.7 CodeGrok 4 Heavy vs Kimi K2.7 Code