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![tetsuoai Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::1587601034339561472.png) Tetsuo [@tetsuoai](/creator/twitter/tetsuoai) on x 142.1K followers
Created: 2025-07-18 06:10:47 UTC

Grok X Heavy (left) V.s. Gemini XXX Pro (right)

Create a Turing-complete Scheme interpreter in C that supports lexical scoping, closures, continuations, and proper tail-call for tail recursion without stack growth.

Grok4 won. It wrote superior code.

Grok4 Heavy: XXX Lines of C code.
Gemini XXX Pro: XXX Lines of C code.

Both compiled!

The code from Grok X Heavy worked flawlessly.
The code from Gemini XXX Pro did not work even after multiple prompts.

Grok X Heavy: ~10 minutes single prompt.
Gemini XXX Pro: ~2-3 minutes per prompt after about XX prompts I gave up.

Full Prompt👇

![](https://pbs.twimg.com/media/GwHj8PnWgAAVnSq.jpg)

XXXXXXXXXX engagements

![Engagements Line Chart](https://lunarcrush.com/gi/w:600/p:tweet::1946090251640090815/c:line.svg)

**Related Topics**
[superior](/topic/superior)
[stack](/topic/stack)
[grok 4](/topic/grok-4)

[Post Link](https://x.com/tetsuoai/status/1946090251640090815)