Model Comparison

GPT-4.1 vs Kimi K2 Base

GPT-4.1 significantly outperforms across most benchmarks.

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Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

GPT-4.1 outperforms in 2 benchmarks (GPQA, MMLU), while Kimi K2 Base is better at 0 benchmarks.

GPT-4.1 significantly outperforms across most benchmarks.

Fri May 15 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only GPT-4.1 specifies input context (1,047,576 tokens). Only GPT-4.1 specifies output context (32,768 tokens).

OpenAI
GPT-4.1
Input1,047,576 tokens
Output32,768 tokens
Moonshot AI
Kimi K2 Base
Input- tokens
Output- tokens
Fri May 15 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-4.1 supports multimodal inputs, whereas Kimi K2 Base does not.

GPT-4.1 can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT-4.1

Text
Images
Audio
Video

Kimi K2 Base

Text
Images
Audio
Video

License

Usage and distribution terms

GPT-4.1 is licensed under a proprietary license, while Kimi K2 Base uses MIT.

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

GPT-4.1

Proprietary

Closed source

Kimi K2 Base

MIT

Open weights

Release Timeline

When each model was launched

GPT-4.1 was released on 2025-04-14, while Kimi K2 Base was released on 2025-07-11.

Kimi K2 Base is 3 months newer than GPT-4.1.

GPT-4.1

Apr 14, 2025

1.1 years ago

Kimi K2 Base

Jul 11, 2025

10 months ago

2mo newer

Knowledge Cutoff

When training data ends

GPT-4.1 has a documented knowledge cutoff of 2024-06-01, while Kimi K2 Base's cutoff date is not specified.

We can confirm GPT-4.1's training data extends to 2024-06-01, but cannot make a direct comparison without Kimi K2 Base's cutoff date.

GPT-4.1

Jun 2024

Kimi K2 Base

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Outputs Comparison

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Key Takeaways

OpenAI
Larger context window (1,047,576 tokens)
Supports multimodal inputs
Higher GPQA score (66.3% vs 48.1%)
Higher MMLU score (90.2% vs 87.8%)
Moonshot AI
Has open weights
OpenAIGPT-4.1
Moonshot AIKimi K2 Base
Compare in Playground

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT-4.1
Moonshot AI
Kimi K2 Base

FAQ

Common questions about GPT-4.1 vs Kimi K2 Base.

Which is better, GPT-4.1 or Kimi K2 Base?

GPT-4.1 significantly outperforms across most benchmarks. GPT-4.1 is made by OpenAI and Kimi K2 Base is made by Moonshot AI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-4.1 compare to Kimi K2 Base in benchmarks?

GPT-4.1 scores MMLU: 90.2%, CharXiv-D: 87.9%, IFEval: 87.4%, MMMLU: 87.3%, MMMU: 74.8%. Kimi K2 Base scores C-Eval: 92.5%, GSM8k: 92.1%, MMLU-redux-2.0: 90.2%, MMLU: 87.8%, TriviaQA: 85.1%.

What are the context window sizes for GPT-4.1 and Kimi K2 Base?

GPT-4.1 supports 1.0M tokens and Kimi K2 Base 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 GPT-4.1 and Kimi K2 Base?

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

Who makes GPT-4.1 and Kimi K2 Base?

GPT-4.1 is developed by OpenAI and Kimi K2 Base is developed by Moonshot AI.