Model Comparison

GPT-4.1 mini vs Kimi-k1.5Which is better in 2026?

Kimi-k1.5 has a slight edge in benchmark performance.

Verdict: GPT-4.1 mini vs Kimi-k1.5 — which is better?

GPT-4.1 mini (by OpenAI) and Kimi-k1.5 (by Moonshot AI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

GPT-4.1 mini outperforms in 2 benchmarks (MMLU, MMMU), while Kimi-k1.5 is better at 3 benchmarks (AIME 2024, IFEval, MathVista). Kimi-k1.5 has a slight edge in benchmark performance.

Choose GPT-4.1 mini if…

  • you want the most recent training data — it shipped Apr 2025

Choose Kimi-k1.5 if…

  • you want the strongest raw capability — it leads on 3 of 5 shared benchmarks

Performance Benchmarks

Comparative analysis across standard metrics

5 benchmarks

GPT-4.1 mini outperforms in 2 benchmarks (MMLU, MMMU), while Kimi-k1.5 is better at 3 benchmarks (AIME 2024, IFEval, MathVista).

Kimi-k1.5 has a slight edge in benchmark performance.

Wed Jul 15 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

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

OpenAI
GPT-4.1 mini
Input1,047,576 tokens
Output32,768 tokens
Moonshot AI
Kimi-k1.5
Input- tokens
Output- tokens
Wed Jul 15 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-4.1 mini and Kimi-k1.5 support multimodal inputs.

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

GPT-4.1 mini

Text
Images
Audio
Video

Kimi-k1.5

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

GPT-4.1 mini

Proprietary

Closed source

Kimi-k1.5

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-4.1 mini was released on 2025-04-14, while Kimi-k1.5 was released on 2025-01-20.

GPT-4.1 mini is 3 months newer than Kimi-k1.5.

GPT-4.1 mini

Apr 14, 2025

1.2 years ago

2mo newer
Kimi-k1.5

Jan 20, 2025

1.5 years ago

Knowledge Cutoff

When training data ends

GPT-4.1 mini has a documented knowledge cutoff of 2024-05-31, while Kimi-k1.5's cutoff date is not specified.

We can confirm GPT-4.1 mini's training data extends to 2024-05-31, but cannot make a direct comparison without Kimi-k1.5's cutoff date.

GPT-4.1 mini

May 2024

Kimi-k1.5

—

Outputs Comparison

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Key Takeaways

OpenAI
Larger context window (1,047,576 tokens)
Higher MMLU score (87.5% vs 87.4%)
Higher MMMU score (72.7% vs 70.0%)
Moonshot AI
Higher AIME 2024 score (77.5% vs 49.6%)
Higher IFEval score (87.2% vs 84.1%)
Higher MathVista score (74.9% vs 73.1%)
OpenAIGPT-4.1 mini
Moonshot AIKimi-k1.5
Compare in Playground

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GPT-4.1 mini and Kimi-k1.5 side-by-side, then vote on the output you prefer.

GPT-4.1 mini
✓ Preferred
Kimi-k1.5
Open in Playground
AI Model Comparison Table
Feature
OpenAI
GPT-4.1 mini
Moonshot AI
Kimi-k1.5

FAQ

Common questions about GPT-4.1 mini vs Kimi-k1.5.

Which is better, GPT-4.1 mini or Kimi-k1.5?

Kimi-k1.5 has a slight edge in benchmark performance. GPT-4.1 mini is made by OpenAI and Kimi-k1.5 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 mini compare to Kimi-k1.5 in benchmarks?

GPT-4.1 mini scores CharXiv-D: 88.4%, MMLU: 87.5%, IFEval: 84.1%, MMMLU: 78.5%, MathVista: 73.1%. Kimi-k1.5 scores MATH-500: 96.2%, CLUEWSC: 91.4%, C-Eval: 88.3%, MMLU: 87.4%, IFEval: 87.2%.

What are the context window sizes for GPT-4.1 mini and Kimi-k1.5?

GPT-4.1 mini supports 1.0M tokens and Kimi-k1.5 supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes GPT-4.1 mini and Kimi-k1.5?

GPT-4.1 mini is developed by OpenAI and Kimi-k1.5 is developed by Moonshot AI.

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