GPT 5.4 wins vs Claude Opus 4.6 in 1 vs. 1 coding battle w/ Claude as Judge

I ran many 1 vs 1 coding battles of Claude Opus 4.6 (max thinking) vs GPT 5.4 (xhigh). When GPT 5.4 is the judge -- Claude rarely wins. Even when I trick GPT into thinking Claude is GPT -- GPT still wins. Even when I make Gemini 3.1 pro the judge-- still