Kimi K2
Kimi K2 is Moonshot AI's agentic MoE language model trained with the MuonClip optimizer, featuring native tool-parsing and a non-thinking reflex design.
Model Overview
Capabilities, design details, and architectural traits
Kimi K2 - Open Agentic Intelligence
Kimi K2 is Moonshot AI's mixture-of-experts language model, released as a non-reasoning Base and post-trained Instruct edition. Rather than leaning on extended chain-of-thought, it is described as a reflex-grade model built to act through tools instead of just answering.
| Trait | Documented Behavior |
|---|---|
| MuonClip Optimizer | Scales the Muon optimizer to an unprecedented size and adds techniques to resolve instability during large-scale pretraining. |
| Agentic-First Design | Built specifically for tool use, reasoning, and autonomous problem-solving rather than general chat alone. |
| Native Tool-Parsing Logic | Ships with Kimi K2's own tool-call parsing format, requiring an inference engine that supports it directly. |
| DeepSeek-V3-derived Architecture | Reduces attention head count for long-context efficiency and raises MoE sparsity for greater token efficiency. |
| Reflex-Grade Response Style | Runs as a non-thinking model, producing direct answers and tool actions without a long reasoning phase. |
Acting, Not Just Answering
Moonshot frames Kimi K2 around autonomous execution rather than conversation alone. Documented examples include multi-step planning across search, calendar, and booking tools, and command-line sessions where the model edits files and runs commands on its own to reach a goal.
Benchmark Performance
Independent evaluations · Artificial Analysis
Accuracy & Capability Details
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| Model Details | |||
|---|---|---|---|
| General Info | |||
| Provider | Kimi | Anthropic | Anthropic |
| Release Date | July 11, 2025 | September 22, 2026 | September 28, 2026 |
| Knowledge Cutoff | Dec 2024 | - | Jun 2026 |
| Context & Limits | |||
| Context Window | 131K | 1M Best Context Window | 1M Best Context Window |
| Pricing (per 1M tokens) | |||
| Input Pricing | $0.57 Best Input Pricing | $4 | $2 |
| Output Pricing | $2.30 Best Output Pricing | $20 | $10 |
| Modalities | |||
| Inputs | text | textimagefile | textimagefile |
| Outputs | text | text | text |
| Benchmarks (0-100) | |||
| Intelligence Index | 12.7 | 57.6 Best Intelligence Index | 56.0 |
| Coding Index | - | - | - |
| Agentic Index | - | - | - |
Humanity's Last Exam
Extremely difficult logical reasoning and knowledge.
Long Context Reasoning
Logical reasoning over long context windows.
SciCode Benchmark
Scientific coding and mathematical modeling.
Independent evaluation data provided by Artificial Analysis. To view the latest benchmarks and full details, visit their official site.
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