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Kimi K2 Base

Moonshot AI

Kimi K2 Base is a cutting-edge language model built on the mixture-of-experts (MoE) architecture with 32 billion activated parameters and 1 trillion total parameters. Trained on 15.5 trillion tokens using the MuonClip optimizer, this is a foundational model prior to instruction tuning. It demonstrates strong performance on knowledge, reasoning, and coding benchmarks while being optimized for agentic capabilities.

Key Specifications

Parameters
1.0T
Context
-
Release Date
January 1, 2025
Average Score
69.2%

Timeline

Key dates in the model's history
Announcement
January 1, 2025
Last Update
July 19, 2025
Today
March 25, 2026

Technical Specifications

Parameters
1.0T
Training Tokens
15.5T tokens
Knowledge Cutoff
-
Family
-
Capabilities
MultimodalZeroEval

Benchmark Results

Model performance metrics across various tests and benchmarks

General Knowledge

Tests on general knowledge and understanding
MMLU
EMSelf-reported
87.8%

Mathematics

Mathematical problems and computations
GSM8k
EMSelf-reported
92.1%
MATH
EMSelf-reported
70.2%

Reasoning

Logical reasoning and analysis
GPQA
Diamond Avg@8 Diamond Avg@8 8 8 Diamond Avg@8 GPT-4o 93,3%, GPT-4o 93,3% 8 Diamond@8 8 "" (multiple shot) —Self-reported
48.1%

Other Tests

Specialized benchmarks
C-Eval
EMSelf-reported
92.5%
CSimpleQA
CorrectSelf-reported
77.6%
EvalPlus
Pass@1 — Pass@1 n c evaluation Pass@1 c/n. Pass@1 Pass@1 = [], Pass@1Self-reported
80.3%
LiveCodeBench v6
Pass@1 Pass@1 - Pass@1: 1. 2. 3. 4. Pass@1 Pass@k, Pass@1 Pass@1Self-reported
26.3%
MMLU-Pro
EMSelf-reported
69.2%
MMLU-redux-2.0
EMSelf-reported
90.2%
SimpleQA
CorrectSelf-reported
35.3%
SuperGPQA
EMSelf-reported
44.7%
TriviaQA
EMSelf-reported
85.1%

License & Metadata

License
modified_mit_license
Announcement Date
January 1, 2025
Last Updated
July 19, 2025

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