One Sentence Summary
Moonshot AI releases open-source model Kimi K3, with 2.8T parameters and 1M context, leading multiple benchmarks and becoming the current strongest open-source model.
Summary
Moonshot AI officially released its latest open-source model, Kimi K3. This model is the world's first open model with parameters reaching the 2.8T scale, supporting a 1M token ultra-long context and native multimodality, designed for long-horizon agentic coding, knowledge work, and reasoning tasks. The official announcement states that the model weights will be open-sourced before July 27, 2026. According to benchmark data cited in the tweet, Kimi K3's overall performance is second only to closed-source models Claude Fable 5 and GPT 5.6 Sol, making it the strongest among open-source models, consistently leading over Claude Opus 4.8, GPT 5.5, GLM-5.2, and others. Particularly in the Frontend Code Arena benchmark on Arena, Kimi K3 scored 1679 points, ranking first, surpassing Claude Fable 5 and GPT-5.6 Sol. The tweet includes a link to the official technical blog and a promotional image.