Maybe I'm missing something, but I'm confused why you compared gemini 2.5 against opus 4.6, and gpt 5.3-codex ? I assume you used sonnet 4.5 because 4.6 was released in the last 2 days, but opus 4.6 and 5.3-codex were released 2 weeks ago, so gemini 3 was definitely around then.