Kimi-K2-Thinking
Kimi K2 Thinking extends the K2 family with a model designed to reason while using tools. The published checkpoint includes quantization-aware training for native INT4 inference.
Reasoning continues between tool results
The model card describes interleaved reasoning and tool calls over long tasks. Moonshot reports runs with hundreds of sequential calls in its evaluation. That result depends on the tools, task environment and generation budget, not only on the model.Kimi-K2-Thinking model card
Quantization is part of this release
Moonshot applied quantization-aware training during post-training and published compressed INT4 weights. This distribution is the Thinking model itself, rather than an additional model family created by converting its files.Kimi-K2-Thinking model card
Turbo was a serving option
The release log announces the thinking model and its Turbo version together. They remain grouped here as a model and its service variant.Kimi API: dated 2025 model release log
The weight license adds Kimi K2 attribution for products above 100 million monthly users or US$20 million monthly revenue.Kimi K2 Thinking license
Practical guidance. Budget for reasoning tokens, tool latency and execution limits. Use an inference engine that supports the released quantization format before comparing its memory requirements.
Specifications & access
| Detail | Value and conditions |
|---|---|
| Launch date | |
| Access | Downloadable |
| Model identifiers | moonshotai/Kimi-K2-Thinkingkimi-k2-thinkingkimi-k2-thinking-turbo |
| Context window | 262,144 tokens Published checkpoint limit; this is not a promise of continued API access. Kimi-K2-Thinking checkpoint configuration |
| Parameters | 1 trillion total; 32 billion active per token.Kimi-K2-Thinking model card |
| Weight license | Modified MIT.Kimi K2 Thinking license |
| Former APIs | kimi-k2-thinking and kimi-k2-thinking-turbo are listed as deprecated.Kimi model catalog |
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