Kimi K2 (0905) is an AI model released by Moonshot AI on Sep 5 2025, 56 days after Kimi K2. It is the 6th tracked release from Moonshot AI out of 10 total. It is an open-source / open-weight model.
It has 1T parameters. Its context window is 256k.
On published benchmarks, it scores 75.1% on GPQA Diamond (graduate-level science reasoning), 65.8% on SWE-Bench Verified (real-world software engineering).
About Moonshot AI: Chinese AI company building the Kimi family of models. Founded in 2023, known for long-context and efficient MoE architectures.