GPT-5.6 Terra vs Grok 4 Heavy
OpenAI GPT-5.6 Terra | SpaceXAI Grok 4 Heavy | |
|---|---|---|
| Overview | ||
| Company | OpenAI | SpaceXAI |
| Release date | Jun 26 2026 | 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. | 53% | — |
Agentic terminal coding Terminal-Bench 2.1Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? Higher is better. | 84.3% | — |
| Timeline | ||
| Release gap | Grok 4 Heavy shipped 352 days before GPT-5.6 Terra | |
Which is better: GPT-5.6 Terra or Grok 4 Heavy?
GPT-5.6 Terra and Grok 4 Heavy don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Grok 4 Heavy shipped 352 days before GPT-5.6 Terra, 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-5.6 Terra and Grok 4 Heavy don't publish scores on any of the same benchmarks.
Frequently asked questions
GPT-5.6 Terra was released by OpenAI on Jun 26 2026.
Grok 4 Heavy was released by SpaceXAI on Jul 9 2025.
Other comparisons
GPT-5.6 Terra vs Claude Sonnet 5Grok 4 Heavy vs Claude Sonnet 5GPT-5.6 Terra vs Gemini OmniGrok 4 Heavy vs Gemini OmniGPT-5.6 Terra vs Muse Spark 1.1Grok 4 Heavy vs Muse Spark 1.1GPT-5.6 Terra vs DeepSeek-V4-ProGrok 4 Heavy vs DeepSeek-V4-ProGPT-5.6 Terra vs Mistral Medium 3.5Grok 4 Heavy vs Mistral Medium 3.5GPT-5.6 Terra vs Kimi K2.7 CodeGrok 4 Heavy vs Kimi K2.7 Code