Kimi K3.1 Pro vs. Claude Opus 5.5: How much do their coding abilities differ, and how many times more expensive is one than the other?
To start with the bottom line: Kimi K3.1 Pro and Claude Opus 5.5 are in the same tier for coding. In Moonshot’s official self-reported Terminal-Bench 4.0 results, K3.1 Pro scored 65.7%, compared with 66.4% for Opus 5.5—a gap of about 0.7 percentage points. Looking only at Terminal-Bench 4.0, third-party evaluator Artificial Analysis actually ranks K3.1…
