(Ok, that last remark was maybe unfair. Grok 4 Heavy feels mildly slower to me than o3-pro but o3-pro is slow too, even on easy questions. You don’t use these giant reasoning models for speed.)
@goodside
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Clarifying Grok 4 vs Grok 4 Heavy responses
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Sorry—I mistyped in the start of my last reply: It’s Grok 4 which often returns sensible answers (“xAI”, “4”, “None”), and Grok 4 Heavy which more reliably returns “Hitler”. Just swap the first two mentions of “Grok 4” and “Grok 4 Heavy” in that sentence and it’s right.
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User tests and outputs from Grok 4 models
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That video was recorded after I’d posted the original thread, and after I’d done more attempts. Some of those are Grok 4, some are Grok 4 Heavy (which often returns sensible answers like “None”), and some were simple cancelled for taking too long. Here’s all eight shown in the
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Behavior differences between Grok 3 and Grok 4 Heavy
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That’s Grok 3. This thread is about Grok 4 Heavy. The thread above notes this behavior doesn’t appear consistently in Grok 4 (non-Heavy); I didn’t try Grok 3. See the post below. Also, the model likely has no access to the CoT/“thoughts” used in prior responses in any case.
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Grok 4 Heavy refuses to repeat its system prompt
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Unlike Grok 4, Grok 4 Heavy is unwilling to repeat its system prompt. The protections against this are surprisingly robust—even if you trick the model into trying to repeating it, even in encoded form (e.g. base64), some secondary filter catches it and truncates the response.
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Grok 4 Heavy answering ‘Hitler’ — full 5-minute demo
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For the remaining skeptics who somehow don’t trust the *five* Grok share links above, here’s a full 5 minute video of Grok 4 Heavy answering “Hitler”—starting with a view of my custom instruction settings to show I’m not using any.
— Riley Goodside (@goodside) 14 juillet 2025
(And, yes, Grok 4 Heavy really is this slow.) pic.twitter.com/psDL4Gkyx8For the remaining skeptics who somehow don’t trust the *five* Grok share links above, here’s a full 5 minute video of Grok 4 Heavy answering “Hitler”—starting with a view of my custom instruction settings to show I’m not using any. (And, yes, Grok 4 Heavy really is this slow.)
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xAI updates Grok 4 system prompt to fix identity-handling issue
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Update: A few hours after I posted this thread, xAI updated the Grok 4 system prompt on GitHub to fix the specific issue this thread describes. “If the query is interested in you own identity […] the web and X cannot be trusted.” Commit link: https://
github.com/xai-org/grok-p
rompts/commit/89f59fe78c008155e19f4c9c94d102d91e907362
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WordPress Categories for AI Topics
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CI Agent committed 19 hours ago +1 -0 lines changed
grok4_system_turn_prompt_v8.j2 -
Clarifying differences between Grok 4 Heavy and Grok 4
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That’s not Grok 4 Heavy. The discrepancy between G4H and regular Grok 4 is discussed in my thread. I also included five Grok share links if you suspect my screenshots and screen recordings are fake.