Model Comparison

GPT-4 vs Kimi-k1.5Which is better in 2026?

Kimi-k1.5 significantly outperforms across most benchmarks.

Verdict: GPT-4 vs Kimi-k1.5 — which is better?

GPT-4 (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 outperforms in 0 benchmarks, while Kimi-k1.5 is better at 1 benchmark (MMLU). Kimi-k1.5 significantly outperforms across most benchmarks.

Choose GPT-4 if…

  • you want predictable pricing at $30.00/M input and $60.00/M output

Choose Kimi-k1.5 if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you want the most recent training data — it shipped Jan 2025

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

GPT-4 outperforms in 0 benchmarks, while Kimi-k1.5 is better at 1 benchmark (MMLU).

Kimi-k1.5 significantly outperforms across most benchmarks.

Thu Jul 30 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only GPT-4 specifies input context (32,768 tokens). Only GPT-4 specifies output context (32,768 tokens).

OpenAI
GPT-4
Input32,768 tokens
Output32,768 tokens
Moonshot AI
Kimi-k1.5
Input- tokens
Output- tokens
Thu Jul 30 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-4 and Kimi-k1.5 support multimodal inputs.

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

GPT-4

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

Proprietary

Closed source

Kimi-k1.5

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-4 was released on 2023-06-13, while Kimi-k1.5 was released on 2025-01-20.

Kimi-k1.5 is 20 months newer than GPT-4.

GPT-4

Jun 13, 2023

3.1 years ago

Kimi-k1.5

Jan 20, 2025

1.5 years ago

1.6yr newer

Knowledge Cutoff

When training data ends

GPT-4 has a documented knowledge cutoff of 2022-12-31, while Kimi-k1.5's cutoff date is not specified.

We can confirm GPT-4's training data extends to 2022-12-31, but cannot make a direct comparison without Kimi-k1.5's cutoff date.

GPT-4

Dec 2022

Kimi-k1.5

—

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

OpenAI
Larger context window (32,768 tokens)
Moonshot AI
Higher MMLU score (87.4% vs 86.4%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GPT-4 and Kimi-k1.5 side-by-side, then vote on the output you prefer.

GPT-4
✓ Preferred
Kimi-k1.5
Open in Playground
AI Model Comparison Table
Feature
OpenAI
GPT-4
Moonshot AI
Kimi-k1.5

FAQ

Common questions about GPT-4 vs Kimi-k1.5.

Which is better, GPT-4 or Kimi-k1.5?

Kimi-k1.5 significantly outperforms across most benchmarks. GPT-4 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 compare to Kimi-k1.5 in benchmarks?

GPT-4 scores AI2 Reasoning Challenge (ARC): 96.3%, HellaSwag: 95.3%, Uniform Bar Exam: 90.0%, SAT Math: 89.0%, LSAT: 88.0%. 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 and Kimi-k1.5?

GPT-4 supports 33K 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 and Kimi-k1.5?

GPT-4 is developed by OpenAI and Kimi-k1.5 is developed by Moonshot AI.

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