Kimi-K3 is wild.

Kimi-K3 is wild. 2.8T params, 896 MoE experts, only 16 active at a time. Native 1M context + multimodal. AA index 57, beats Opus 4.8 and GPT-5.5. #1 on Arena WebDev, 1527 on long agent tasks (2nd). Pricing is brutal. ¥2/M input (90%+ cache hit), ¥100/M output. Opensourcing before July 27. Strongest open model right now. I used K3 to generate a playable guitar. Final result stunned me. Cost me ¥5 in API calls but I hit errors the whole time. Honest take: too pricey right now, compute is tight.