Model Comparison

Kimi K2.5 vs Mistral Medium 3.5

Kimi K2.5 shows notably better performance in the majority of benchmarks. Kimi K2.5 is 2.5x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

Kimi K2.5 outperforms in 2 benchmarks (AIME 2025, BrowseComp), while Mistral Medium 3.5 is better at 1 benchmark (SWE-Bench Verified).

Kimi K2.5 shows notably better performance in the majority of 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 Mistral Medium 3.5 ($1.50/1M tokens).

For output processing, Kimi K2.5 ($3.00/1M tokens) is 2.5x cheaper than Mistral Medium 3.5 ($7.50/1M tokens).

In conclusion, Mistral Medium 3.5 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

Mistral Medium 3.5

Input tokens$1.50

Output tokens$7.50

Best providerMistral

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Model Size

Parameter count comparison

872.0B diff

Kimi K2.5 has 872.0B more parameters than Mistral Medium 3.5, making it 681.3% larger.

Kimi K2.5

1.0Tparameters

Mistral Medium 3.5

128.0Bparameters

1000.0B

Kimi K2.5

128.0B

Mistral Medium 3.5

Context Window

Maximum input and output token capacity

Kimi K2.5 accepts 262,100 input tokens compared to Mistral Medium 3.5's 256,000 tokens. Kimi K2.5 can generate longer responses up to 262,100 tokens, while Mistral Medium 3.5 is limited to 256,000 tokens.

Kimi K2.5

Input262,100 tokens

Output262,100 tokens

Mistral Medium 3.5

Input256,000 tokens

Output256,000 tokens

Wed May 20 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Kimi K2.5 and Mistral Medium 3.5 support multimodal inputs.

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

Kimi K2.5

Text

Images

Audio

Video

Mistral Medium 3.5

Text

Images

Audio

Video

License

Usage and distribution terms

Kimi K2.5 is licensed under MIT, while Mistral Medium 3.5 uses Modified MIT License.

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

Kimi K2.5

MIT

Open weights

Mistral Medium 3.5

Modified MIT License

Open weights

Release Timeline

When each model was launched

Kimi K2.5 was released on 2026-01-27, while Mistral Medium 3.5 was released on 2026-04-29.

Mistral Medium 3.5 is 3 months newer than Kimi K2.5.

Kimi K2.5

Jan 27, 2026

3 months ago

Mistral Medium 3.5

Apr 29, 2026

3 weeks ago

3mo 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

Provider Availability

Kimi K2.5 is available from Fireworks, Moonshot AI. Mistral Medium 3.5 is available from Mistral AI.

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

Mistral Medium 3.5

Mistral

Input Price:Input: $1.50/1MOutput Price:Output: $7.50/1M

* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Kimi K2.5

View details

Moonshot AI

Larger context window (262,100 tokens)

Less expensive input tokens

Less expensive output tokens

Higher AIME 2025 score (96.1% vs 86.3%)

Higher BrowseComp score (74.9% vs 48.6%)

Mistral Medium 3.5

View details

Mistral AI

Higher SWE-Bench Verified score (77.6% vs 76.8%)

Detailed Comparison

AI Model Comparison Table
Feature	Kimi K2.5	Mistral Medium 3.5

FAQ

Common questions about Kimi K2.5 vs Mistral Medium 3.5.

Which is better, Kimi K2.5 or Mistral Medium 3.5?

Kimi K2.5 shows notably better performance in the majority of benchmarks. Kimi K2.5 is made by Moonshot AI and Mistral Medium 3.5 is made by Mistral AI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Kimi K2.5 compare to Mistral Medium 3.5 in benchmarks?

Kimi K2.5 scores AIME 2025: 96.1%, HMMT 2025: 95.4%, InfoVQAtest: 92.6%, OCRBench: 92.3%, MathVista-Mini: 90.1%. Mistral Medium 3.5 scores COLLIE: 95.8%, Tau3 Telecom: 91.4%, AIME 2025: 86.3%, SWE-Bench Verified: 77.6%, Tau3 Retail: 76.1%.

Is Kimi K2.5 cheaper than Mistral Medium 3.5?

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. Mistral Medium 3.5 costs $1.50/M input and $7.50/M output via mistral.

What are the context window sizes for Kimi K2.5 and Mistral Medium 3.5?

Kimi K2.5 supports 262K tokens and Mistral Medium 3.5 supports 256K 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 Mistral Medium 3.5?

Key differences include context window (262K vs 256K), input pricing ($0.60 vs $1.50/M), licensing (MIT vs Modified MIT License). See the full comparison above for benchmark-by-benchmark results.

Who makes Kimi K2.5 and Mistral Medium 3.5?

Kimi K2.5 is developed by Moonshot AI and Mistral Medium 3.5 is developed by Mistral AI.