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Moonshot AIReleased July 1, 2025

Moonshot Kimi k2

Open Source#8 Arena Rank1T MoE parameters

Moonshot Kimi k2 ranks in the top 10 on the Arena leaderboard. Context window: 0.131K tokens.

Context

131K

Input

$0.55

Key Specifications

🏆

Arena Rank

#8

📐

Context Window

131K

📥

Input Price

per 1M tokens

$0.55

📤

Output Price

per 1M tokens

$2.20

🧠

Parameters

1T MoE

🔓

Open Source

Yes

Best For

Codingagentic tasksreasoning

About Moonshot Kimi k2

Moonshot Kimi k2 is a massive open-source model with 1 trillion mixture-of-experts parameters, making it one of the largest openly available AI models. Developed by Chinese AI startup Moonshot AI (creators of the popular Kimi chatbot), it rivals frontier proprietary models on coding and agentic benchmarks while being freely accessible. The model uses an efficient MoE architecture where only a fraction of parameters activate per token, keeping inference costs manageable despite its enormous size. Kimi k2 excels at code generation, tool use, and multi-step reasoning tasks. Its release represents a significant milestone in open-source AI, demonstrating that the community can produce models competitive with the largest proprietary systems.

Pricing per 1M tokens

Input Tokens

$0.55

Output Tokens

$2.20

Compare Moonshot Kimi k2

See how Moonshot Kimi k2 stacks up against other leading AI models

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Frequently Asked Questions

What is Moonshot Kimi k2?▾
Moonshot Kimi k2 is a massive open-source model with 1 trillion mixture-of-experts parameters, making it one of the largest openly available AI models. Developed by Chinese AI startup Moonshot AI (creators of the popular Kimi chatbot), it rivals frontier proprietary models on coding and agentic benchmarks while being freely accessible. The model uses an efficient MoE architecture where only a fraction of parameters activate per token, keeping inference costs manageable despite its enormous size. Kimi k2 excels at code generation, tool use, and multi-step reasoning tasks. Its release represents a significant milestone in open-source AI, demonstrating that the community can produce models competitive with the largest proprietary systems.
How much does Moonshot Kimi k2 cost?▾
Input pricing for Moonshot Kimi k2 is $0.55 per million tokens; output runs $2.20. Token-based pricing means you can scale up or down without a fixed commitment.
What is Moonshot Kimi k2's context window?▾
The context window for Moonshot Kimi k2 is 131K tokens. That's the maximum amount of text you can feed into a single prompt, including system instructions, conversation history, and the actual query.
Is Moonshot Kimi k2 open source?▾
Moonshot Kimi k2 is fully open source. You can grab the weights, run it on your own hardware, and fine-tune it for specific tasks. That flexibility is a big deal for teams with strict data requirements.
What is Moonshot Kimi k2 best for?▾
The sweet spot for Moonshot Kimi k2 is: Coding, agentic tasks, reasoning. If your workload fits one of these categories, it's worth benchmarking against alternatives.