Model Comparison

GPT-4 Turbo vs Kimi K2 BaseWhich is better in 2026?

Kimi K2 Base shows notably better performance in the majority of benchmarks.

Verdict: GPT-4 Turbo vs Kimi K2 Base — which is better?

GPT-4 Turbo (by OpenAI) and Kimi K2 Base (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 Turbo outperforms in 1 benchmarks (MATH), while Kimi K2 Base is better at 2 benchmarks (GPQA, MMLU). Kimi K2 Base shows notably better performance in the majority of benchmarks.

Choose GPT-4 Turbo if…

  • you want predictable pricing at $10.00/M input and $30.00/M output

Choose Kimi K2 Base if…

  • you want the strongest raw capability — it leads on 2 of 3 shared benchmarks
  • you want the most recent training data — it shipped Jul 2025
  • you need open weights you can self-host or fine-tune

Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

GPT-4 Turbo outperforms in 1 benchmarks (MATH), while Kimi K2 Base is better at 2 benchmarks (GPQA, MMLU).

Kimi K2 Base shows notably better performance in the majority of benchmarks.

Fri Jul 24 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only GPT-4 Turbo specifies input context (128,000 tokens). Only GPT-4 Turbo specifies output context (4,096 tokens).

OpenAI
GPT-4 Turbo
Input128,000 tokens
Output4,096 tokens
Moonshot AI
Kimi K2 Base
Input- tokens
Output- tokens
Fri Jul 24 2026 • llm-stats.com

License

Usage and distribution terms

GPT-4 Turbo 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 Turbo

Proprietary

Closed source

Kimi K2 Base

MIT

Open weights

Release Timeline

When each model was launched

GPT-4 Turbo was released on 2024-04-09, while Kimi K2 Base was released on 2025-07-11.

Kimi K2 Base is 15 months newer than GPT-4 Turbo.

GPT-4 Turbo

Apr 9, 2024

2.3 years ago

Kimi K2 Base

Jul 11, 2025

1.0 years ago

1.3yr newer

Knowledge Cutoff

When training data ends

GPT-4 Turbo has a documented knowledge cutoff of 2023-12-31, while Kimi K2 Base's cutoff date is not specified.

We can confirm GPT-4 Turbo's training data extends to 2023-12-31, but cannot make a direct comparison without Kimi K2 Base's cutoff date.

GPT-4 Turbo

Dec 2023

Kimi K2 Base

—

Outputs Comparison

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Key Takeaways

OpenAI
Larger context window (128,000 tokens)
Higher MATH score (72.6% vs 70.2%)
Moonshot AI
Has open weights
Higher GPQA score (48.1% vs 48.0%)
Higher MMLU score (87.8% vs 86.5%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GPT-4 Turbo and Kimi K2 Base side-by-side, then vote on the output you prefer.

GPT-4 Turbo
✓ Preferred
Kimi K2 Base
Open in Playground
AI Model Comparison Table
Feature
OpenAI
GPT-4 Turbo
Moonshot AI
Kimi K2 Base

FAQ

Common questions about GPT-4 Turbo vs Kimi K2 Base.

Which is better, GPT-4 Turbo or Kimi K2 Base?

Kimi K2 Base shows notably better performance in the majority of benchmarks. GPT-4 Turbo 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 Turbo compare to Kimi K2 Base in benchmarks?

GPT-4 Turbo scores MGSM: 88.5%, HumanEval: 87.1%, MMLU: 86.5%, DROP: 86.0%, MATH: 72.6%. 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 Turbo and Kimi K2 Base?

GPT-4 Turbo supports 128K 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 Turbo and Kimi K2 Base?

Key differences include licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-4 Turbo and Kimi K2 Base?

GPT-4 Turbo is developed by OpenAI and Kimi K2 Base is developed by Moonshot AI.

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