GPT-5.4 nano vs Grok 4.1 Fast
OpenAI GPT-5.4 nano | SpaceXAI Grok 4.1 Fast | |
|---|---|---|
| Overview | ||
| Company | OpenAI | SpaceXAI |
| Release date | Mar 17 2026 | Nov 19 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. | 14% | 19%Best |
| Timeline | ||
| Release gap | Grok 4.1 Fast shipped 118 days before GPT-5.4 nano | |
Which is better: GPT-5.4 nano or Grok 4.1 Fast?
Grok 4.1 Fast leads GPT-5.4 nano on 1 of the 1 benchmark they both report (BullshitBench v2). Grok 4.1 Fast shipped 118 days before GPT-5.4 nano, 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 4.1 Fast leads at 19% vs GPT-5.4 nano at 14%.
Frequently asked questions
GPT-5.4 nano was released by OpenAI on Mar 17 2026.
Grok 4.1 Fast was released by SpaceXAI on Nov 19 2025.
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