Kimi K3 vs Gemini 3.1 Pro (default)

Kimi K3 is #8, Gemini 3.1 Pro is #63, and the spread is nine points of overall score, 89.39 against 80.21. That reads harsher than most people expect from Gemini, which is a strong model on plenty of other work. On this job the failure is specific: length adherence at 75.91 against Kimi's 90.46, and continuity at 78.40 against 88.28. Fourteen and ten points. It writes fine paragraphs and does not hold a long script together or land near a target length. Its cue quality at 81.66 is the part that holds up best. Gemini is much faster, 60 seconds against 367, and less than half the price, 12 cents against 26. So it's the quick cheap draft against the one that needs less work afterward. On a 4,000 word brief I know which side of that I'd rather be on, but if you're generating a lot of short material the calculus changes.

Pick Kimi K3 for long-form, where holding length and flow across the whole script is the actual job.
Pick Gemini 3.1 Pro if you want drafts back in about a minute at half the cost and you're editing structure anyway.