
Kimi K3.1 Pro vs Opus 5.5: Which Is Better for Agentic Tasks?
A 13-task test of Kimi K3.1 Pro against Claude Opus 5.5 in the same Claude Code harness: where Kimi matches Opus, where it cuts corners, and what to check.

A 13-task test of Kimi K3.1 Pro against Claude Opus 5.5 in the same Claude Code harness: where Kimi matches Opus, where it cuts corners, and what to check.

Kimi K3.1 Pro tested against Opus 5.5 and GPT 6.1 Soul: pricing, open-weight caveats, and hands-on demos from a Rubik's cube to a Fall Guys clone.

Kimi K3.1 Pro claims near-Opus results, but a six-task KingBench run scored it 5.37/10. See task scores, cost, and how it compares to rivals.