Kimi K3: 2.8T parameter open-weight frontier model with 1M context

Moonshot AI released Kimi K3, a 2.8 trillion parameter open-weight model with 1 million token context and native multimodal capabilities. It benchmarks second only to Claude Fable 5 on AA-Briefcase agentic benchmark and scores 57 on Artificial Analysis Intelligence Index, comparable to Opus 4.8 and GPT-5. Kimi Delta Attention enables 6.3x faster decoding in million-token contexts.