Moonshot AI releases Kimi K3, a 2.8-trillion-parameter open-weight model beating Opus 4.8 and GPT-5.5

Moonshot AI released Kimi K3, a 2.8-trillion-parameter mixture-of-experts open-weight model with a 1-million-token context window and always-on reasoning, live now on kimi.com and the Kimi API at $3/$15 per million input/output tokens with full weights due July 27. Its benchmarks top Anthropic's Opus 4.8 and OpenAI's GPT-5.5 on agentic tasks, trailing only Fable 5 and GPT-5.6 Sol — a frontier-class open-weight release that puts near-top agentic capability behind a downloadable checkpoint anyone can self-host.

Source: reuters.com ↗