o3 vs Grok 4.3 Beta
OpenAI o3 | SpaceXAI Grok 4.3 Beta | |
|---|---|---|
| Overview | ||
| Company | OpenAI | SpaceXAI |
| Release date | Apr 16 2025 | Apr 17 2026 |
| 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. | 26% | 50%Best |
| Timeline | ||
| Release gap | o3 shipped 366 days before Grok 4.3 Beta | |
Which is better: o3 or Grok 4.3 Beta?
Grok 4.3 Beta leads o3 on 1 of the 1 benchmark they both report (BullshitBench v2). o3 shipped 366 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 o3 at 26%.
Frequently asked questions
o3 was released by OpenAI on Apr 16 2025.
Grok 4.3 Beta was released by SpaceXAI on Apr 17 2026.
Other comparisons
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