Moonshot AI’s Kimi K2 outperforms GPT-4 in key benchmarks — and it’s free

Moonshot AI, the Chinese artificial intelligence startup behind the popular Kimi chatbot, released an open-source language model on Friday that directly challenges proprietary systems from OpenAI and Anthropic with particularly strong performance on coding and autonomous agent tasks.

The new model, called Kimi K2, features 1 trillion total parameters with 32 billion activated parameters in a mixture-of-experts architecture. The company is releasing two versions: a foundation model for researchers and developers, and an instruction-tuned variant optimized for chat and autonomous agent applications.

? Hello, Kimi K2! Open-Source Agentic Model!
? 1T total / 32B active MoE model
? SOTA on SWE Bench Verified, Tau2 & AceBench among open models
?Strong in coding and agentic tasks
? Multimodal & thought-mode not supported for now

With Kimi K2, advanced agentic intelligence… pic.twitter.com/PlRQNrg9JL

— Kimi.ai (@Kimi_Moonshot) July 11, 2025

“Kimi K2 does not just answer; it acts,” the company stated in its announcement blog. “With ...