Model Comparison

Gemini 2.5 Flash vs Kimi K2 Instruct

Gemini 2.5 Flash significantly outperforms across most benchmarks. Kimi K2 Instruct is 1.7x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

6 benchmarks

Gemini 2.5 Flash outperforms in 5 benchmarks (Aider-Polyglot, AIME 2024, AIME 2025, GPQA, Humanity's Last Exam), while Kimi K2 Instruct is better at 1 benchmark (SimpleQA).

Gemini 2.5 Flash significantly outperforms across most benchmarks.

Mon May 25 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Kimi K2 Instruct costs less

For input processing, Gemini 2.5 Flash ($0.30/1M tokens) is 1.7x cheaper than Kimi K2 Instruct ($0.50/1M tokens).

For output processing, Gemini 2.5 Flash ($2.50/1M tokens) is 5.0x more expensive than Kimi K2 Instruct ($0.50/1M tokens).

In conclusion, Gemini 2.5 Flash is more expensive than Kimi K2 Instruct.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Mon May 25 2026 • llm-stats.com
Google
Gemini 2.5 Flash
Input tokens$0.30
Output tokens$2.50
Best providerGoogle
Moonshot AI
Kimi K2 Instruct
Input tokens$0.50
Output tokens$0.50
Best providerFireworks
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Context Window

Maximum input and output token capacity

Gemini 2.5 Flash accepts 1,048,576 input tokens compared to Kimi K2 Instruct's 200,000 tokens. Kimi K2 Instruct can generate longer responses up to 200,000 tokens, while Gemini 2.5 Flash is limited to 65,536 tokens.

Google
Gemini 2.5 Flash
Input1,048,576 tokens
Output65,536 tokens
Moonshot AI
Kimi K2 Instruct
Input200,000 tokens
Output200,000 tokens
Mon May 25 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Gemini 2.5 Flash supports multimodal inputs, whereas Kimi K2 Instruct does not.

Gemini 2.5 Flash can handle both text and other forms of data like images, making it suitable for multimodal applications.

Gemini 2.5 Flash

Text
Images
Audio
Video

Kimi K2 Instruct

Text
Images
Audio
Video

License

Usage and distribution terms

Gemini 2.5 Flash is licensed under a proprietary license, while Kimi K2 Instruct uses MIT.

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

Gemini 2.5 Flash

Proprietary

Closed source

Kimi K2 Instruct

MIT

Open weights

Release Timeline

When each model was launched

Gemini 2.5 Flash was released on 2025-05-20, while Kimi K2 Instruct was released on 2025-07-11.

Kimi K2 Instruct is 2 months newer than Gemini 2.5 Flash.

Gemini 2.5 Flash

May 20, 2025

1.0 years ago

Kimi K2 Instruct

Jul 11, 2025

10 months ago

1mo newer

Knowledge Cutoff

When training data ends

Gemini 2.5 Flash has a documented knowledge cutoff of 2025-01-31, while Kimi K2 Instruct's cutoff date is not specified.

We can confirm Gemini 2.5 Flash's training data extends to 2025-01-31, but cannot make a direct comparison without Kimi K2 Instruct's cutoff date.

Gemini 2.5 Flash

Jan 2025

Kimi K2 Instruct

—

Provider Availability

Gemini 2.5 Flash is available from Google. Kimi K2 Instruct is available from Fireworks, Novita.

Gemini 2.5 Flash

google logo
Google
Input Price:Input: $0.30/1MOutput Price:Output: $2.50/1M

Kimi K2 Instruct

fireworks logo
Fireworks
Input Price:Input: $0.50/1MOutput Price:Output: $0.50/1M
novita logo
Novita
Input Price:Input: $0.57/1MOutput Price:Output: $2.30/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Google
Larger context window (1,048,576 tokens)
Supports multimodal inputs
Less expensive input tokens
Higher Aider-Polyglot score (61.9% vs 60.0%)
Higher AIME 2024 score (88.0% vs 69.6%)
Higher AIME 2025 score (72.0% vs 49.5%)
Higher GPQA score (82.8% vs 75.1%)
Higher Humanity's Last Exam score (11.0% vs 4.7%)
Moonshot AI
Less expensive output tokens
Has open weights
Higher SimpleQA score (31.0% vs 26.9%)
GoogleGemini 2.5 Flash
Moonshot AIKimi K2 Instruct
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Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 2.5 Flash
Moonshot AI
Kimi K2 Instruct

FAQ

Common questions about Gemini 2.5 Flash vs Kimi K2 Instruct.

Which is better, Gemini 2.5 Flash or Kimi K2 Instruct?

Gemini 2.5 Flash significantly outperforms across most benchmarks. Gemini 2.5 Flash is made by Google and Kimi K2 Instruct is made by Moonshot AI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Gemini 2.5 Flash compare to Kimi K2 Instruct in benchmarks?

Gemini 2.5 Flash scores Global-MMLU-Lite: 88.4%, AIME 2024: 88.0%, FACTS Grounding: 85.3%, GPQA: 82.8%, MMMU: 79.7%. Kimi K2 Instruct scores MATH-500: 97.4%, GSM8k: 97.3%, CBNSL: 95.6%, HumanEval: 93.3%, MMLU-Redux: 92.7%.

Is Gemini 2.5 Flash cheaper than Kimi K2 Instruct?

Gemini 2.5 Flash is 1.7x cheaper for input tokens. Gemini 2.5 Flash costs $0.30/M input and $2.50/M output via google. Kimi K2 Instruct costs $0.50/M input and $0.50/M output via fireworks.

What are the context window sizes for Gemini 2.5 Flash and Kimi K2 Instruct?

Gemini 2.5 Flash supports 1.0M tokens and Kimi K2 Instruct supports 200K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini 2.5 Flash and Kimi K2 Instruct?

Key differences include context window (1.0M vs 200K), input pricing ($0.30 vs $0.50/M), multimodal support (yes vs no), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 2.5 Flash and Kimi K2 Instruct?

Gemini 2.5 Flash is developed by Google and Kimi K2 Instruct is developed by Moonshot AI.