Model Comparison

GPT-5 mini vs Kimi K2-Thinking-0905

Kimi K2-Thinking-0905 significantly outperforms across most benchmarks. GPT-5 mini is 1.2x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

GPT-5 mini outperforms in 0 benchmarks, while Kimi K2-Thinking-0905 is better at 4 benchmarks (AIME 2025, GPQA, HMMT 2025, Humanity's Last Exam).

Kimi K2-Thinking-0905 significantly outperforms across most benchmarks.

Fri May 22 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT-5 mini costs less

For input processing, GPT-5 mini ($0.25/1M tokens) is 1.9x cheaper than Kimi K2-Thinking-0905 ($0.47/1M tokens).

For output processing, GPT-5 mini ($2.00/1M tokens) costs the same as Kimi K2-Thinking-0905 ($2.00/1M tokens).

In conclusion, Kimi K2-Thinking-0905 is more expensive than GPT-5 mini.*

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

Lowest available price from all providers
Fri May 22 2026 • llm-stats.com
OpenAI
GPT-5 mini
Input tokens$0.25
Output tokens$2.00
Best providerOpenAI
Moonshot AI
Kimi K2-Thinking-0905
Input tokens$0.47
Output tokens$2.00
Best providerDeepinfra
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GPT-5 mini accepts 400,000 input tokens compared to Kimi K2-Thinking-0905's 262,144 tokens. Kimi K2-Thinking-0905 can generate longer responses up to 262,144 tokens, while GPT-5 mini is limited to 128,000 tokens.

OpenAI
GPT-5 mini
Input400,000 tokens
Output128,000 tokens
Moonshot AI
Kimi K2-Thinking-0905
Input262,144 tokens
Output262,144 tokens
Fri May 22 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-5 mini supports multimodal inputs, whereas Kimi K2-Thinking-0905 does not.

GPT-5 mini can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT-5 mini

Text
Images
Audio
Video

Kimi K2-Thinking-0905

Text
Images
Audio
Video

License

Usage and distribution terms

GPT-5 mini is licensed under a proprietary license, while Kimi K2-Thinking-0905 uses MIT.

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

GPT-5 mini

Proprietary

Closed source

Kimi K2-Thinking-0905

MIT

Open weights

Release Timeline

When each model was launched

GPT-5 mini was released on 2025-08-07, while Kimi K2-Thinking-0905 was released on 2025-09-05.

Kimi K2-Thinking-0905 is 1 month newer than GPT-5 mini.

GPT-5 mini

Aug 7, 2025

9 months ago

Kimi K2-Thinking-0905

Sep 5, 2025

8 months ago

4w newer

Knowledge Cutoff

When training data ends

GPT-5 mini has a documented knowledge cutoff of 2024-05-30, while Kimi K2-Thinking-0905's cutoff date is not specified.

We can confirm GPT-5 mini's training data extends to 2024-05-30, but cannot make a direct comparison without Kimi K2-Thinking-0905's cutoff date.

GPT-5 mini

May 2024

Kimi K2-Thinking-0905

—

Provider Availability

GPT-5 mini is available from OpenAI. Kimi K2-Thinking-0905 is available from DeepInfra, Novita, Fireworks.

GPT-5 mini

openai logo
OpenAI
Input Price:Input: $0.25/1MOutput Price:Output: $2.00/1M

Kimi K2-Thinking-0905

deepinfra logo
Deepinfra
Input Price:Input: $0.47/1MOutput Price:Output: $2.00/1M
novita logo
Novita
Input Price:Input: $0.48/1MOutput Price:Output: $2.00/1M
fireworks logo
Fireworks
Input Price:Input: $0.60/1MOutput Price:Output: $2.50/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

OpenAI
Larger context window (400,000 tokens)
Supports multimodal inputs
Less expensive input tokens
Moonshot AI
Has open weights
Higher AIME 2025 score (100.0% vs 91.1%)
Higher GPQA score (84.5% vs 82.3%)
Higher HMMT 2025 score (97.5% vs 87.8%)
Higher Humanity's Last Exam score (51.0% vs 16.7%)

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT-5 mini
Moonshot AI
Kimi K2-Thinking-0905

FAQ

Common questions about GPT-5 mini vs Kimi K2-Thinking-0905.

Which is better, GPT-5 mini or Kimi K2-Thinking-0905?

Kimi K2-Thinking-0905 significantly outperforms across most benchmarks. GPT-5 mini is made by OpenAI and Kimi K2-Thinking-0905 is made by Moonshot AI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-5 mini compare to Kimi K2-Thinking-0905 in benchmarks?

GPT-5 mini scores AIME 2025: 91.1%, HMMT 2025: 87.8%, GPQA: 82.3%, FrontierMath: 22.1%, Humanity's Last Exam: 16.7%. Kimi K2-Thinking-0905 scores AIME 2025: 100.0%, HMMT 2025: 97.5%, MMLU-Redux: 94.4%, FRAMES: 87.0%, MMLU-Pro: 84.6%.

Is GPT-5 mini cheaper than Kimi K2-Thinking-0905?

GPT-5 mini is 1.9x cheaper for input tokens. GPT-5 mini costs $0.25/M input and $2.00/M output via openai. Kimi K2-Thinking-0905 costs $0.47/M input and $2.00/M output via deepinfra.

What are the context window sizes for GPT-5 mini and Kimi K2-Thinking-0905?

GPT-5 mini supports 400K tokens and Kimi K2-Thinking-0905 supports 262K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-5 mini and Kimi K2-Thinking-0905?

Key differences include context window (400K vs 262K), input pricing ($0.25 vs $0.47/M), multimodal support (yes vs no), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-5 mini and Kimi K2-Thinking-0905?

GPT-5 mini is developed by OpenAI and Kimi K2-Thinking-0905 is developed by Moonshot AI.