GPT-5.3-Codex-Spark vs Grok 4.3 Beta
OpenAI GPT-5.3-Codex-Spark | SpaceXAI Grok 4.3 Beta | |
|---|---|---|
| Overview | ||
| Company | OpenAI | SpaceXAI |
| Release date | Feb 12 2026 | Apr 17 2026 |
| Access | Proprietary | Proprietary |
| Specifications | ||
Context window | 128k | — |
| 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. | — | 50% |
| Timeline | ||
| Release gap | GPT-5.3-Codex-Spark shipped 64 days before Grok 4.3 Beta | |
Which is better: GPT-5.3-Codex-Spark or Grok 4.3 Beta?
GPT-5.3-Codex-Spark and Grok 4.3 Beta don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GPT-5.3-Codex-Spark shipped 64 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.
Direct benchmark comparisons are unavailable — GPT-5.3-Codex-Spark and Grok 4.3 Beta don't publish scores on any of the same benchmarks.
Frequently asked questions
GPT-5.3-Codex-Spark was released by OpenAI on Feb 12 2026.
Grok 4.3 Beta was released by SpaceXAI on Apr 17 2026.
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