Kimi K2-Instruct-0905
by Moonshot AI
Kimi K2-Instruct-0905 is a model from Moonshot AI, released on September 5, 2025. It ranks #117 of 220 models by Intelligence Score with a score of 21.5.
Kimi K2-Instruct-0905 is the latest, most capable version of Kimi K2, achieving state-of-the-art performance in frontier knowledge, math, and coding among non-thinking models. This Mixture-of-Experts model features 32 billion activated parameters and 1 trillion total parameters, meticulously optimized for agentic tasks. Key features include enhanced agentic coding intelligence, extended context length to 256K tokens, and a hybrid architecture trained with MuonClip optimizer on 15.5T tokens. The model achieves 65.8% on SWE-bench Verified (single attempt), 47.3% on SWE-bench Multilingual, and excels at tool use with 70.6% on Tau2-retail. It is a reflex-grade model without long thinking, designed to act and execute complex tasks seamlessly.
Key specs
| Provider | Moonshot AI |
|---|---|
| Release date | 2025-09-05 |
| License | open source |
| Intelligence Score | 21.5 |
| Coding index | 9.6 |
Quick answers
Is Kimi K2-Instruct-0905 open source?
Yes. Kimi K2-Instruct-0905 is an open model released under the open source license.
When was Kimi K2-Instruct-0905 released?
Moonshot AI released Kimi K2-Instruct-0905 on September 5, 2025.
How does Kimi K2-Instruct-0905 compare to Claude Opus 5.5 (Reasoning)?
Kimi K2-Instruct-0905 scores 21.5 on the Intelligence Score versus 60.5 for Claude Opus 5.5 (Reasoning), the current #1.
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