GPT-5.4 mini vs Grok 4.3 Beta
OpenAI GPT-5.4 mini | SpaceXAI Grok 4.3 Beta | |
|---|---|---|
| Overview | ||
| Company | OpenAI | SpaceXAI |
| Release date | Mar 17 2026 | Apr 17 2026 |
| Access | Proprietary | Proprietary |
| Specifications | ||
Context window | 400k | — |
| 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. | 32% | 50%Best |
| Timeline | ||
| Release gap | GPT-5.4 mini shipped 31 days before Grok 4.3 Beta | |
Which is better: GPT-5.4 mini or Grok 4.3 Beta?
Grok 4.3 Beta leads GPT-5.4 mini on 1 of the 1 benchmark they both report (BullshitBench v2). GPT-5.4 mini shipped 31 days before Grok 4.3 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.
On BullshitBench v2, Grok 4.3 Beta leads at 50% vs GPT-5.4 mini at 32%.
Frequently asked questions
GPT-5.4 mini was released by OpenAI on Mar 17 2026.
Grok 4.3 Beta was released by SpaceXAI on Apr 17 2026.
Other comparisons
GPT-5.4 mini vs Claude Sonnet 5Grok 4.3 Beta vs Claude Sonnet 5GPT-5.4 mini vs Gemini 3.5 FlashGrok 4.3 Beta vs Gemini 3.5 FlashGPT-5.4 mini vs Muse Spark 1.1Grok 4.3 Beta vs Muse Spark 1.1GPT-5.4 mini vs DeepSeek-V4-ProGrok 4.3 Beta vs DeepSeek-V4-ProGPT-5.4 mini vs Mistral Medium 3.5Grok 4.3 Beta vs Mistral Medium 3.5GPT-5.4 mini vs Kimi K2.7 CodeGrok 4.3 Beta vs Kimi K2.7 Code