Model Comparison

Kimi K2.5 vs Gemini 3.5 Flash

Gemini 3.5 Flash significantly outperforms across most benchmarks. Kimi K2.5 is 2.8x cheaper per token.

Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

5 benchmarks

Kimi K2.5 outperforms in 1 benchmarks (Humanity's Last Exam), while Gemini 3.5 Flash is better at 4 benchmarks (CharXiv-R, MMMU-Pro, SWE-Bench Pro, Terminal-Bench 2.0).

Gemini 3.5 Flash significantly outperforms across most benchmarks.

Wed May 20 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Kimi K2.5 costs less

For input processing, Kimi K2.5 ($0.60/1M tokens) is 2.5x cheaper than Gemini 3.5 Flash ($1.50/1M tokens).

For output processing, Kimi K2.5 ($3.00/1M tokens) is 3.0x cheaper than Gemini 3.5 Flash ($9.00/1M tokens).

In conclusion, Gemini 3.5 Flash is more expensive than Kimi K2.5.*

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

Lowest available price from all providers

Wed May 20 2026 • llm-stats.com

Kimi K2.5

Input tokens$0.60

Output tokens$3.00

Best providerFireworks

Gemini 3.5 Flash

Input tokens$1.50

Output tokens$9.00

Best providerGoogle

Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Gemini 3.5 Flash accepts 1,048,576 input tokens compared to Kimi K2.5's 262,100 tokens. Kimi K2.5 can generate longer responses up to 262,100 tokens, while Gemini 3.5 Flash is limited to 65,536 tokens.

Kimi K2.5

Input262,100 tokens

Output262,100 tokens

Gemini 3.5 Flash

Input1,048,576 tokens

Output65,536 tokens

Wed May 20 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Kimi K2.5 and Gemini 3.5 Flash support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Kimi K2.5

Text

Images

Audio

Video

Gemini 3.5 Flash

Text

Images

Audio

Video

License

Usage and distribution terms

Kimi K2.5 is licensed under MIT, while Gemini 3.5 Flash uses a proprietary license.

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

Kimi K2.5

MIT

Open weights

Gemini 3.5 Flash

Proprietary

Closed source

Release Timeline

When each model was launched

Kimi K2.5 was released on 2026-01-27, while Gemini 3.5 Flash was released on 2026-05-19.

Gemini 3.5 Flash is 4 months newer than Kimi K2.5.

Kimi K2.5

Jan 27, 2026

3 months ago

Gemini 3.5 Flash

May 19, 2026

1 days ago

3mo newer

Knowledge Cutoff

When training data ends

Gemini 3.5 Flash has a documented knowledge cutoff of 2026-01-31, while Kimi K2.5's cutoff date is not specified.

We can confirm Gemini 3.5 Flash's training data extends to 2026-01-31, but cannot make a direct comparison without Kimi K2.5's cutoff date.

Kimi K2.5

—

Gemini 3.5 Flash

Jan 2026

Provider Availability

Kimi K2.5 is available from Fireworks, Moonshot AI. Gemini 3.5 Flash is available from Google.

Kimi K2.5

Fireworks

Input Price:Input: $0.60/1MOutput Price:Output: $3.00/1M

Unknown Organization

Input Price:Input: $0.60/1MOutput Price:Output: $3.00/1M

Gemini 3.5 Flash

Google

Input Price:Input: $1.50/1MOutput Price:Output: $9.00/1M

* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Kimi K2.5

View details

Moonshot AI

Less expensive input tokens

Less expensive output tokens

Has open weights

Higher Humanity's Last Exam score (50.2% vs 40.2%)

Gemini 3.5 Flash

View details

Google

Larger context window (1,048,576 tokens)

Higher CharXiv-R score (84.2% vs 77.5%)

Higher MMMU-Pro score (83.6% vs 78.5%)

Higher SWE-Bench Pro score (55.1% vs 50.7%)

Higher Terminal-Bench 2.0 score (76.2% vs 50.8%)

Detailed Comparison

AI Model Comparison Table
Feature	Kimi K2.5	Gemini 3.5 Flash

FAQ

Common questions about Kimi K2.5 vs Gemini 3.5 Flash.

Which is better, Kimi K2.5 or Gemini 3.5 Flash?

Gemini 3.5 Flash significantly outperforms across most benchmarks. Kimi K2.5 is made by Moonshot AI and Gemini 3.5 Flash is made by Google. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Kimi K2.5 compare to Gemini 3.5 Flash in benchmarks?

Kimi K2.5 scores AIME 2025: 96.1%, HMMT 2025: 95.4%, InfoVQAtest: 92.6%, OCRBench: 92.3%, MathVista-Mini: 90.1%. Gemini 3.5 Flash scores CharXiv-R: 84.2%, MCP Atlas: 83.6%, MMMU-Pro: 83.6%, OSWorld-Verified: 78.4%, Terminal-Bench 2.0: 76.2%.

Is Kimi K2.5 cheaper than Gemini 3.5 Flash?

Kimi K2.5 is 2.5x cheaper for input tokens. Kimi K2.5 costs $0.60/M input and $3.00/M output via fireworks. Gemini 3.5 Flash costs $1.50/M input and $9.00/M output via google.

What are the context window sizes for Kimi K2.5 and Gemini 3.5 Flash?

Kimi K2.5 supports 262K tokens and Gemini 3.5 Flash supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Kimi K2.5 and Gemini 3.5 Flash?

Key differences include context window (262K vs 1.0M), input pricing ($0.60 vs $1.50/M), licensing (MIT vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Kimi K2.5 and Gemini 3.5 Flash?

Kimi K2.5 is developed by Moonshot AI and Gemini 3.5 Flash is developed by Google.