Kimi K2 Base
by Moonshot AI
Kimi K2 Base is a model from Moonshot AI, released on July 11, 2025. It ranks #150 of 220 models by Intelligence Score with a score of 13.4.
Kimi K2 base model is a state-of-the-art mixture-of-experts (MoE) language model with 32 billion activated parameters and 1 trillion total parameters. Trained on 15.5 trillion tokens with the MuonClip optimizer, this is the foundation model before instruction tuning. It demonstrates strong performance on knowledge, reasoning, and coding benchmarks while being optimized for agentic capabilities.
Key specs
| Provider | Moonshot AI |
|---|---|
| Release date | 2025-07-11 |
| License | open source |
| Intelligence Score | 13.4 |
| Coding index | 10.6 |
Quick answers
Is Kimi K2 Base open source?
Yes. Kimi K2 Base is an open model released under the open source license.
When was Kimi K2 Base released?
Moonshot AI released Kimi K2 Base on July 11, 2025.
How does Kimi K2 Base compare to Claude Opus 5.5 (Reasoning)?
Kimi K2 Base scores 13.4 on the Intelligence Score versus 60.5 for Claude Opus 5.5 (Reasoning), the current #1.
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