Same code, about 60% more output tokens on Claude: 80 runs across Claude Code, Codex and Antigravity in 5 languages

Update (Oct 23): Antigravity now has 5 runs per language as well, so the dataset has 100 runs. Opus in Antigravity came out at 602 output tokens per 1,000 characters (was 596), and the gap to Gemini a