Bijan Bowen tests Kimi K3 across a browser operating system, a C++ skate game, interactive product sites, CAD-style modeling, 3D environments and a long-running multi-agent game build. The model frequently produces detailed, interactive results that approach proprietary frontier systems.
Bijan Bowen praises Kimi K3's visual quality, persistence and broad competence, especially in complex 3D scenes and multi-step builds. The main weaknesses are excessive reasoning time, occasional control or geometry failures and runs that can consume hours before revealing a blocking bug.
Bijan Bowen concludes that Kimi K3 is the best open-weight model he has tested and can credibly enter comparisons with leading closed models. Its much larger scale and higher API price make it less accessible than earlier Kimi releases, but the capability jump is substantial.
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