The AI arena is free today

Open Superagent

Kimi K2 Instruct vs Nova 2 Omni

Nova 2 Omni leads the LLM Stats Score 25.7 to 21.9.

Moonshot AI · Amazon · Updated for 2026

Which is better?

Nova 2 Omni leads the overall LLM Stats Score 25.7 to 21.9, ranking #161 overall.

In the 6 individual benchmarks reported for both models, Nova 2 Omni wins 5; this is a narrower head-to-head signal than the composite indexes.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Kimi K2 Instruct

  • you need open weights you can self-host or fine-tune

Choose Nova 2 Omni

  • overall performance matters — it scores 25.7 and ranks #161 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 5 of 6 exact shared results
  • you want the most recent training data — it shipped Dec 2025

At a glance

The differences that matter most.

Kimi K2 Instruct
Moonshot AI
Nova 2 Omni
Amazon
Core performance indexes
LLM Stats Score
21.9
#188
25.7
#161
Reasoning
22.0
#178
28.0
#137
Agents
-1.0
#181
4.6
#157
Cost, coverage & limits
Benchmark wins
1 of 6
5 of 6
Input price
$0.50 / M
— / M
Output price
$0.50 / M
— / M
Context window
200,000
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

3 shared
Index
Kimi K2 Instruct
Nova 2 Omni
Math
22.2#142
25.1#115
Tool use
6.4#150
14.8#96
Writing
11.7#65
23.5#9
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

38 reported for Kimi K2 Instruct · 18 for Nova 2 Omni

6 shared

Kimi K2 Instruct outperforms in 1 benchmarks (MMLU-Pro), while Nova 2 Omni is better at 5 benchmarks (AIME 2025, Multi-Challenge, Tau2 Airline, Tau2 Retail, Tau2 Telecom).

Nova 2 Omni significantly outperforms across most benchmarks.

Wed Sep 23 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Kimi K2 Instruct specifies input context (200,000 tokens). Only Kimi K2 Instruct specifies output context (200,000 tokens).

Moonshot AI
Kimi K2 Instruct
Input200,000 tokens
Output200,000 tokens
Amazon
Nova 2 Omni
Input- tokens
Output- tokens
Wed Sep 23 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Nova 2 Omni supports multimodal inputs, whereas Kimi K2 Instruct does not.

Nova 2 Omni can handle both text and other forms of data like images, making it suitable for multimodal applications.

Kimi K2 Instruct

Text
Images
Audio
Video

Nova 2 Omni

Text
Images
Audio
Video

License

Usage and distribution terms

Kimi K2 Instruct is licensed under MIT, while Nova 2 Omni uses a proprietary license.

License differences may affect how you can use these models in commercial or open-source projects.

Kimi K2 Instruct

MIT

Open weights

Nova 2 Omni

Proprietary

Closed source

Release Timeline

When each model was launched

Kimi K2 Instruct was released on 2025-07-11, while Nova 2 Omni was released on 2025-12-02.

Nova 2 Omni is 5 months newer than Kimi K2 Instruct.

Kimi K2 Instruct

Jul 11, 2025

1.2 years ago

Nova 2 Omni

Dec 2, 2025

9 months ago

4mo newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Kimi K2 Instruct and Nova 2 Omni side-by-side, then vote on the output you prefer.

Kimi K2 Instruct
✓ Preferred
Nova 2 Omni
Open in Playground

FAQ

Common questions about Kimi K2 Instruct vs Nova 2 Omni.

Which is better, Kimi K2 Instruct or Nova 2 Omni?

Nova 2 Omni leads the LLM Stats Score 25.7 to 21.9. Kimi K2 Instruct is made by Moonshot AI and Nova 2 Omni is made by Amazon. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Kimi K2 Instruct compare to Nova 2 Omni in benchmarks?

Kimi K2 Instruct scores MATH-500: 97.4%, GSM8k: 97.3%, CBNSL: 95.6%, HumanEval: 93.3%, MMLU-Redux: 92.7%. Nova 2 Omni scores AIME 2025: 92.1%, RefCOCOg: 86.3%, ScreenSpot: 85.4%, MMLU-Pro: 80.7%, Tau2 Telecom: 80.0%.

What are the context window sizes for Kimi K2 Instruct and Nova 2 Omni?

Kimi K2 Instruct supports 200K tokens and Nova 2 Omni supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Kimi K2 Instruct and Nova 2 Omni?

Key differences include LLM Stats Score (21.9 vs 25.7), multimodal support (no vs yes), licensing (MIT vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Kimi K2 Instruct and Nova 2 Omni?

Kimi K2 Instruct is developed by Moonshot AI and Nova 2 Omni is developed by Amazon.

Related comparisons